Cladding Replacement Works: Materials & Workmanship 14-03-2021

FPB: 1001
M D Bithrey Chartered Surveyors Ltd
Highbury Square Management Company Ltd
Cladding Replacement
Works
Materials & Workmanship
14-03-2021
FPB: 1001 - Cladding Replacement Works – Materials & Workmanship
Client: Highbury Square Management Company Ltd
Contents
H92 Rainscreen cladding .....................................................................................................................1
J42 Single layer polymeric sheet roof coverings ............................................................................11
K11 Rigid sheet flooring/ sheathing/ decking/ sarking/ linings/ casings ......................................14
M21 Insulation with rendered finish..................................................................................................16
M60 Painting/clear finishing ..............................................................................................................24
N16 Bird and vermin control systems ..............................................................................................28
P10 Sundry insulation/ proofing work ..............................................................................................30
Z11 Purpose made metalwork ...........................................................................................................34
Z20 Fixings and adhesives ................................................................................................................37
Z22 Sealants........................................................................................................................................40
Z31 Powder coatings..........................................................................................................................41
H92
Rainscreen cladding
Tendering - Not Used
Type(s) of rainscreen cladding
120 A Rainscreen cladding
1. Manufacturer: Sotech Ltd
1.1. Web: www.sotech-optima.co.uk
1.2. Email: technical@sotech-optima.co.uk
2. Product Reference: Optima FC+ Rainscreen
3. Panel Description: 3mm solid aluminium cassette panels with concealed stiffening as necessary
to meet performance criteria for deflection under wind load as clause H92/350.
4. Minimum ventilation air gap: 38mm from face of insulation to back of panel
5. Substrate: Fit to RCM Y wall as clause K11/795A
6. Secondary weatherings: EPDM as clause P10/311
7. Breather membrane: Tyvek Firecurb as clause P10/320A
8. Thermal insulation: 75mm Rockwool Rainscreen Duo-slab as clause P10/217
9. Secondary support structure: FC+ brackets and rails with slide lock adjustment mechanism
9.1. Support structure description: The structural wall brackets 65mm are manufactured from
extruded aluminium with a hands free facility for fixing to the extruded carrier profile allowing
for adjustment in all planes and overall depth adjustment of 160mm-192mm. The carrier
profile has panel retention hooks, mechanically fixed using CNC production guidelines
before delivery to site. The support framing must allow for calculated expansion movement
of the whole system vertically and horizontally.
9.2. Material: Extruded aluminium to BS1474 in 6063/T6 grade alloy.
10. Fire Cavity Barriers: See clause 490 and below. Contractor to mark proposed locations on
elevation drawings as clause 230.
10.1. Vertical: Siderise RV (90/60) with OSCI panel inserts as clause P10/432 or equal approved.
10.2. Horizontal: Siderise RH 25G (90/60) Open state horizontal fire barriers with OSCI panel
inserts as clause P10/435 or equal approved.
11. Cladding panels: Individually demountable cassette panels as detailed below:
11.1. Material: Aluminium as clause 712.
11.2. Thickness: 3mm
11.3. Finish: Aluminium: 3 mm; polyester powder coated (PPC) to BS 6496.
11.4. Colour: To match existing - RAL 7004 - Provide samples as clause 240 for approval of finish
and colour selection prior to order.
11.5. Overall panel thickness: 50mm
11.6. Panel stiffening: Provide as necessary to meet performance criteria for deflection under
wind load as clause 350.
11.7. Panel joints: 20 mm recessed baffled joints vertically and horizontally
11.8. Panel clips: PVC anti-rattle clips to be incorporated into pre-punched, snap-in sloots in
panels.
11.9. Security fixings: 2 small wafer head, self tapping stainless steel screws per panel.
12. Reveals: Typical window reveals in standard FC+ details
13. Samples required: Provide as clauses 240 and 250
M D Bithrey Chartered Surveyors H92

Ltd Rainscreen cladding
14-03-2021 Page 1 of 44
14. Copings: Provide new system copings to match cladding to small section of parapet wall serving
the low level cladding to the east elevation of the South Stand.
15. System accessories: All necessary flashings, closer pieces etc the material, finish and colour to
match cladding and to be manufactured by Sotech Ltd., the Rainscreen manufacturer. See also
major Non-Standard components detailed below.
130 Major nonstandard components

1. Description: Rainwater pipe encasement.
2. Location: Rear elevation to penthouse level
3. Manufacturer: Cladding manufacturer
4. Fire performance requirements: As clause 470 for rain screen cladding
5. Material: 2-3mm Aluminium as clause 712.
6. Finish: Aluminium: 3 mm; polyester powder coated (PPC) to BS 6496. Colour to match cladding
7. Fixing: As existing
8. Other requirements: Note: The proposed 35mm increase in the cladding system build depth may
require setting the pipes into the cladding zone slightly. The contractor is to Submit proposals
prior to final fabrication for approval of C.A.
130 A Major nonstandard components

1. Description: Cladding spandrel panel infills to penthouse level between eaves soffit lining and top
of curtain walling system.
2. Location: Pitch facing elevation and returns to flank elevations back to specified hook on cladding.
8. Other requirements: Sealant joint as existing. Allow to release and then refit retained soffit linings
above to facilitate installation.
130 B Major nonstandard components

1. Description: Cladding to high level beams that bridge across the recessed balcony terraces at
penthouse level.
2. Location: Rear elevation at penthouse level
8. Other requirements: Jointing as existing - Submit proposals for approval.
130 C Major nonstandard components

1. Description: Fixed Brise Soleil beams that span the depth of the rear elevation terraces at high
level. Aluminium box sections.
2. Location: Rear elevation terraces at penthouse level

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8. Other requirements: Submit proposals for approval.
General requirements/preparatory work

210 Design
1. Rainscreen cladding system and associated features: New cladding is to replicate existing
cladding appearance in terms of panel size, joints and spacing but allowing for an increase in
overall wall build thickness. Complete detailed design in accordance with this specification and
submit before commencement of fabrication.
2. System depth Penthouse level: Existing system depth is 128mm from face of sheathing board to
face of panels. This will increase by 35mm to 163mm to facilitate the use of the smallest available
system brackets and accommodate 75mm of Rockwool Rainscreen Duo-slab whilst retaining
38mm ventilation gap. This will require alterations to the following:
2.1. Rainwater pipe encasements: Existing rain pipe connection are not to be adjusted.
Contractor must allow where required for recessing the pipe casing into the cladding wall
build where required and for detailing accordingly.
2.2. Flush fascia eaves: To perimeter of recessed terrace area the roof fascia finishes flush with
the face of the cladding below as existing detail 1925-S-213. Increasing the depth of the
cladding system build will require replacement of the Sarnametal kerb edge trim with a wider
trim and making good to the single ply membrane as detailed under section J42
2.3. Brise soleil: The existing Brise Soleil system to the terraces consist of hollow aluminium box
sections with a matching finish. These are to be replaced with new matching section size
with length adjusted to suit new cladding wall build depth.
3. System depth south stand East elevation: Existing system depth is 83mm from face of sheathing
board to face of panels. This will increase by 80mm to 163mm to facilitate the use of the smallest
available system brackets and accommodate 75mm of Rockwool Rainscreen Duo-slab whilst
retaining 38mm ventilation gap. This will require alterations to the following:
3.1. Pitch facing end pier: See existing detail 1926-675. Contractor is to demolish and rebuild
SFS frame to pier to reduce overall structural width maintaining the finished face of the
panel lines as shown upon the marked up drawing.
3.2. Build around gate post: The existing gate to the underpass is a 120 x 120mm steel post set
30mm away from the face of the cladding. Contractor must detail a recess in the new
cladding to accommodate the gate width.
3.3. Copings: Provide new copings from system manufacturer to suit increased overall wall build
width.
4. Related works: Coordinate in detailed design.
215 Design proposals

1. Submission of alternative proposals: Preliminary design drawings indicate intent. Other
reasonable proposals will be considered.
220 Specification
1. Compliance standards: The Centre for Window and Cladding Technology (CWCT) 'Standard for
systemised building envelopes'.
2. Reference information: For the duration of the contract, keep available at the design office,
workshop and on site copies of:
2.1. The Centre for Window and Cladding Technology (CWCT) 'Standard for systemised building
envelopes'.
2.2. Publications invoked by the CWCT 'Standard for systemised building envelopes'.
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230 Information to be provided during detailed design

1. Submit the following cladding particulars
1.1. A schedule of detailed drawings and dates for submission for comment.
1.2. A schedule of loads that will be transmitted from the rainscreen cladding to the structure.
1.3. Proposed fixing details and systems relevant to the structural design and construction with
methods of adjustment and tolerances.
1.4. A schedule of fabrication tolerances/ size tolerances.
1.5. A detailed testing programme in compliance with the Main Contract master programme.
1.6. A detailed fabrication and installation programme in compliance with the Main Contract
master programme.
1.7. Proposals to support outstanding applications for Building Regulations consents or
relaxations.
1.8. Detail location and types of proposed cavity barriers to satisfy Approved Document B2 of the
Building Regulations
232 Quality plan

1. Requirement: Submit during detailed design.
2. Content: In accordance with BS EN ISO 9001 and including the following:
2.1. Name of the quality manager.
2.2. Quality assessment procedures.
2.3. Inspection procedures to be adopted in checking the work.
2.4. Stages at which check lists will be used and samples of the lists.
2.5. List of work procedures on the correct use of materials or components, both off site and on
site.
2.6. List of product information with latest revisions.
2.7. Subcontractors involved in the work.
2.8. Subcontractors quality plans.
2.9. Storage, handling, transport and protection procedures.
2.10. Procedure for registering and reporting non compliances.
2.11. Maintenance procedures and calibration records.
2.12. Certification that completed work complies with specification.
2.13. Check list register to ensure all items have been inspected and non-compliances
discharged.
235 Information to be provided before commencement of rainscreen cladding

system
1. Submit the following cladding particulars
1.1. Detailed drawings to fully describe fabrication and installation.
1.2. Detailed calculations to prove compliance with design/ performance requirements.
1.3. Project specific fabrication, handling and installation method statements.
1.4. Certification for incorporated components manufactured by others confirming their suitability
for proposed locations in the rainscreen cladding.
1.5. Recommendations for spare parts for future repairs or replacements.
1.6. Recommendations for safe dismantling and recycling or disposal of products.

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240 Product samples

1. General: Before commencing detailed design, submit labelled samples of: Proposed panel
sample. Note samples of powder coating finishes are required under clause Z31/230 .
250 Samples of fixings

1. General: During detailed design, submit labelled samples of each type of fixing, together with
manufacturers' recommended torque figures.
Design/performance requirements
310 CWCT 'Standard for systemised building envelopes'
1. General: Unless specified or agreed otherwise comply with:
1.1. Part 2 - Loads, fixings and movement.
1.2. Part 3 - Air, water and wind resistance.
1.3. Part 4 - Operable components, additional elements and means of access.
1.4. Part 5 - Thermal, moisture and acoustic performance.
1.5. Part 6 - Fire performance.
1.6. Part 7 - Robustness, durability, tolerances and workmanship.
2. Project performance requirements specified in this subsection: Read in conjunction with CWCT
performance requirements.
340 Integrity
1. Requirement: The rainscreen cladding must resist wind loads, dead loads and design live loads,
and accommodate deflections and movements without damage.
2. Design wind pressure: Calculate in accordance with BS EN 1991-1-4 and National Annex.
3. Impact performance: In accordance with BS8200 and CWCT TN 75
4. Other design parameters: None
350 Deflection under wind load

1. Requirement: For listed components, at positive and negative applications of the design wind
pressure, normal deflections are not to exceed: As stated below.
1.1. Individual rainscreen panels - L90 of the span measured between the points of attachment
of the panel – this being defined as the perimeter folded edges of the panel. The panel face
(or pan) is to be designed to accept repeated deflection without damage based upon the
mechanical properties of the panel material
1.2. Framing members – L/200 of the span of the member measured between points
of attachment to the building, or 20mm, whichever is the lesser
2. Additional stiffness to CWCT 'Standard for systemised building envelopes' clause 3.5.4.2: Not
allowed
360 Wind resistance – cyclic loading

1. Requirement: No reduction in the integrity of the rainscreen cladding must occur when subjected
to the test sequence given in CWCT 'Standard for systemised building envelopes', clause 8.14.6.
2. Test method: As clause 665.
2.1. Effective wind pressure: Determine in accordance with CWCT Standard, clause 2.2.5.1
370 Appearance and fit

1. Requirement: Design rainscreen wall:

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1.1. To ensure position and alignment of all parts and features as shown on preliminary design
drawings.
1.2. To accommodate deviations in the primary support structure.
2. Primary support structure: Before commencing installation of rainscreen cladding system, carry
out survey sufficient to verify that required accuracy of erection can be achieved.
2.1. Give notice: If the structure will not allow the required accuracy or security of erection.
3. Maximum permitted component and installation tolerances: As set out below
3.1. Panel width: +/- 3mm
3.2. Panel length: +/- 3mm
3.3. Squareness of panels: When the longest of two adjacent sides of the panel is taken as the
base line, the deviation of the shorter side measured from a perpendicular to the baseline at
any point along the baseline not to exceed +/- 3mm
3.4. Flatness: Deviation under a 1m straight edge placed anywhere on a flat surface not to
exceed 3mm
3.5. Joint alignment: Alignment of joints between adjacent panels: deviation of panel corner from
protected lines of edges of adjacent panels not to exceed 3mm
3.6. Panel faces: Alignment of faces to adjacent panels - Deviation of panel edge under a 1m
straight edge placed across adjacent panel not to exceed 3mm
390 Air permeability generally

1. The average air leakage rate through the listed wall(s) at a differential pressure of 50 pascals
must not exceed 10m3/hr/m2
410 Air permeability

1. Permeability class to BS EN 12152: A2
1.1. Peak test pressure: 300 Pa
420 Water penetration

1. Watertightness class to BS EN 12154: R5
1.1. Peak test pressure: 300 Pa
2. Additional requirements: Mineral wool insulation attached to backing wall not to be wetted at peak
test pressure
450 Air and Vapour control layer

1. Condensation risk within rainscreen wall: Determine using the method described in BS 5250,
Annex D. Where required, provide a suitable air and vapour control layer to ensure that damage
and nuisance from condensation is reduced.
470 Fire performance of rainscreen cladding

1. Standard: In accordance with the CWCT 'Standard for systemised building envelopes', section 6
and TN 98.
2. Reaction to fire
2.1. External surfaces: To BS EN 13501-1, Class A2-s1, d0 or better
2.2. Internal (cavity) surfaces: To BS EN 13501-1, Class A1
3. Verification of fire performance: In accordance with BRE BR 135 and BS 8414-2
485 Internal reaction to fire of backing wall

1. Class (minimum): BS EN 13501-1, Class A1

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490 Fire resistance of cavity fire barriers

1. Standard: To BS EN 13501-2
2. Requirement: To resist the passage of flame and smoke for not less than 60 minutes' integrity, 60
minutes' insulation.
495 Durability
1. Design life of the rainscreen cladding system: Not less than 30 years
2. Secondary components: Submit details together with required maintenance regime, replacement
periods and methods of replacement.
Testing
500 Testing general
1. The Centre for Window and Cladding Technology have developed “The Standard for Testing of
Ventilated Rainscreen” and “Test Methods for Ventilated Rainscreen” Sotech have commissioned
and passed the following tests which are required by these standards for rainscreen systems.
1.1. Dynamic water pressure test - weather tightness and water penetration
1.2. Wind loading – Serviceability (positive and negative)
1.3. Wind loading – Safety (load applied as serviceability test x 1.5 for safety factor)
1.4. Wind resistance – Cyclic loading as test regime defined in “Standard for Walls with
Ventilated Rainscreen” section 2.8.2 and BRE digest 346 part 7 (load applied as wind
loading, serviceability test level)
1.5. Soft body impact test.
2. Other tests required are detailed in clauses below.
510 Comparison (type) testing

1. Commencement of fabrication and installation of rainscreen cladding: Not until test results and
reports showing compliance with this specification have been submitted.
595 Air permeability test - Air barrier

1. To CWCT “Standard for testing of ventilated rainscreen”, clause 3.3 and 3.3.1
2. Peak test pressure: As clause 410
3. Allowable leakage rates: As clause 390
Products
710 Aluminium alloy framing sections
1. Standards: To BS EN 755 alloy EN AW-6063 and suitable for the specified finish.
2. Structural members: To comply with BS EN 1999-1-1, -3 and -4.
712 Aluminium alloy sheet

1. Standards: To BS EN 485, BS EN 515 and BS EN 573.
2. Alloy, temper and thickness: Suitable for the application and specified finish.
715 Carbon steel framing sections/ Reinforcement

1. Standards: To the relevant parts of BS 7668, BS EN 10029, BS EN 10025 or BS EN 10210.
2. Thickness: Suitable for the application, and for galvanizing or other protective coating.

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717 Carbon steel sheet

1. Standards: To the relevant parts of BS 1449-1, BS EN 10048, BS EN 10051, BS EN 10111, BS
EN 10131, BS EN 10132, BS EN 10139, BS EN 10140, BS EN 10149-1, -2, -3, BS EN 10209, or
BS EN 10268.
2. Grade and thickness: Suitable for the application, and for galvanizing or other protective coating.
720 Stainless steel sheet

1. Standards: To the relevant parts of BS EN 10029, BS EN 10048, BS EN 10051, BS EN 10095 or
BS EN ISO 9445-1 and -2.
2. Grade: To BS EN 10088-2, -4, -5, austenitic 1.4301 (304) generally, 1.4301 (316) when used
externally or in severely corrosive environments.
3. Thickness: Suitable for the application.
730 Mechanical fixings – material requirements

1. Stainless steel: To BS EN ISO 3506 grade A2 generally, grade A4 when used in severely
corrosive environments.
2. Carbon steel: To BS 4190 and suitable for galvanizing or other protective coating.
3. Aluminium: To BS EN 755.
732 Adhesives
1. General: Not degradable by moisture or water vapour.
735 Fixings and fasteners

1. Type and use: Reviewed and approved by manufacturers. Submit confirmatory information on
request.
2. Dimensions: Not less than recommended by their manufacturers.
3. Adjustment capability: Sufficient in three dimensions to accommodate primary support structure
and rainscreen cladding fabrication/ installation tolerances.
760 Gaskets
1. Material
1.1. Noncellular rubber to BS 4255-1.
1.2. Cellular rubber to ASTM-C509-06.
2. Durability: Resistant to oxidation, ozone and UV degradation.
770 General sealants

1. Selection: In accordance with BS 6213 from:
1.1. Silicone.
1.2. One part polysulfide.
1.3. Two part polysulfide.
1.4. One or two part polyurethane.
2. Classification and requirements: To BS EN ISO 11600.
3. Reaction to contact products and finishes: Stable and compatible.
Finishes
810 Protective coating of carbon steel framing sections/ Reinforcement
1. Treatment: All surfaces to one of the following:
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1.1. Hot dip galvanized to BS EN ISO 1461.

1.2. An appropriate equivalent coating to BS EN ISO 12944 and BS EN ISO 14713-1 and -2.
820 Protective coating of carbon steel mechanical fixings

1. Treatment: All surfaces to one of the following:
1.1. Hot dip galvanized to BS EN ISO 1461.
1.2. Sherardized to BS EN ISO 17668, Class 30 coating thickness and passivated.
1.3. Zinc plated to BS EN ISO 2081, coating designation of FE//Zn//C for an iridescent (yellow
passivate) chromate conversion coating or FE//Zn//D for an opaque (olive green) chromate
conversion coating.
830 Powder coating

1. Requirement: As section Z31.
Fabrication and installation

910 Generally
1. Electrolytic corrosion: Take necessary measures to prevent.
2. Identification of products: Mark or tag to facilitate identification during assembly, handling, storage
and installation. Do not mark surfaces visible in the complete installation.
3. Installers: Employ competent rainscreen cladding operatives and provide records of their
experience to the C.A upon request.
4. Appearance: Select and align all products to ensure uniformity.
5. Joints: Match existing locations and ensure joint widths are uniform.
6. Cuts: Machine cut and drill in workshop wherever possible.
912 Metalwork
1. Requirement: As section Z11, unless specified otherwise in this section.
922 Fixings/ Adhesives application

925 Sealant application

930 Assembly
1. Location: Carry out as much assembly as possible in the workshop.
2. Joints: Other than movement joints and designed open joints, must be rigidly secured, reinforced
where necessary and fixed with hairline abutments.
3. Displacement of components in assembled units: Submit proposals for reassembly on site.
960 Preliminary rainscreen cladding installation

1. Requirement: Complete an area of cladding as set out below for inspection and approval of
appearance.
2. Wall areas to recessed terrace to check interface with other building components .
970 Rainscreen cladding installation

1. Tightening mechanical fasteners: To manufacturer's recommended torque figures. Do not
overtighten fasteners intended to permit differential movement.
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2. Protective coverings: Remove only where necessary to facilitate installation and from surfaces
which will be inaccessible on completion.
975 Welding
1. In situ welding: Not permitted
980 Interfaces
1. Installation: Locate flashings, closers etc. correctly and neatly overlap cladding to form a
weathertight junction.
985 Damage
1. Repairs: Do not repair cladding without approval.
1.1. Approval: Will not be given where the proposed repair will impair performance or
appearance.
2. Record of repairs: Prepare schedule or record on drawings for inclusion in the maintenance
manual.
995 Maintenance
1. Maintenance manual: Incorporate details within the Building Manual in accordance with CWCT
'Standard for systemised building envelopes', clause 7.6.1.
1.1. Materials certification and test reports to be included:
Ω End of Section

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J42
Single layer polymeric sheet roof coverings
Types of roof covering - Not Used
Performance - Not Used
Products
320 A Primer
1. Manufacturer: Sika Sarnafil
1.1. Web: www.sarnafil.co.uk
1.2. Email: sarnafilroofing@uk.sika.com
2. Product Reference: Primer 610
3. Colour: Black
325 A Adhesive
2. Product Reference: Sarnacol 2170
345 A Perimeter trims

2. Product Reference: Sarnafil G/S Metal Coil
3. Top surface colour: Light grey as existing
4. Size: As existing but able to accommodate the increased 35mm wall build depth below.
355 Mechanical fasteners, washers, pressure plates, etc.

1. Type: Point fastener
1.1. Material: As membrane manufacturer's/ supplier's recommendations
2. Manufacturer: Submit proposals
2.1. Product reference: Submit proposals
400 A Waterproof membrane

2. Product Reference: Sarnafil® G410-EL SA
Execution generally
510 Adverse weather
1. General: Do not lay membrane at temperatures below 5°C or in wet or damp conditions unless
effective temporary cover is provided over working area.
M D Bithrey Chartered Surveyors J42

Ltd Single layer polymeric sheet roof coverings
14-03-2021 Page 11 of 44
2. Unfinished areas of roof: Keep dry and protect edges of laid membrane from wind action.
520 Incomplete work

1. End of working day: Provide temporary seal to prevent water infiltration.
2. On resumption of work: Cut away tail of membrane from completed area and remove from roof.
530 Applying primers

1. Coverage per coat (minimum): As membrane manufacturers recommendations
2. Surface coverage: Even and full.
3. Coats: Fully bonded. Allow volatiles to dry off thoroughly between coats.
550 Control samples

1. Type of covering: Reinstatement of kerb edge drip detail
2. Sample area (minimum): 1-2m in length to drip edge
2.1. Location: Select one recessed terrace location
2.2. Features: Edge drip detail
3. Approval of appearance: Obtain before proceeding with remaining work.
Substrates/ air and vapour control layers/ warm deck roof insulation
610 Suitability of substrates
1. Surfaces to be covered: Secure, clean, dry, smooth, free from frost, contaminants, voids and
protrusions.
2. Preliminary work: Complete, including
2.1. Grading to correct falls.
2.2. Formation of upstands, kerbs, box gutters, sumps, grooves, chases and expansion joints.
2.3. Fixing of battens, fillets and anchoring plugs/ strips.
3. Moisture content and stability of substrate: Must not impair integrity of roof.
620 Renewing existing coverings

1. Areas to be renewed: Drip edge detail to perimeter of recessed terraces only to allow replacement
of cladding fascia detail.
2. Substrate: Do not damage.
3. Timing: Remove only sufficient coverings as will be renewed and made weathertight on same
day.
625 Removing existing coverings

1. Mechanical stripping: Not permitted
2. Exposed substrate: Do not damage.
Waterproof membranes/ accessories

710 Mechanical fixing of waterproof membrane
1. Setting out: To match existing allowing for 35mm increased wall depth build below to kerb edge.
2. Laying: Loose, do not wrinkle or stretch.
3. Installing fasteners
3.1. Use manufacturer's/ supplier's recommended methods and equipment.
3.2. Insertion: Correct and consistent.
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4. Washers/ Pressure plates/ Bars

4.1. Distance from fixed edge (minimum): 10 mm.
4.2. Fixing: Flush with membrane.
5. Sheet overlaps: Extend beyond washers/ pressure plates by minimum 50 mm.
6. Surface condition at completion: Fully sealed, smooth, weatherproof and free draining.
720 Adhesive bonding of waterproof membrane

1. Setting out: To match existing allowing for 35mm increased wall depth build below to kerb edge.
2. Attachment: Fully adhered on a continuous even coating of adhesive
2.1. Do not wrinkle or stretch.
3. Surface condition at completion: Fully sealed, smooth, weatherproof and free draining.
730 Welded jointing of waterproof membrane

1. Side and end joints
1.1. Laps (minimum): As membrane manufacturers recommendations.
1.2. Preparation: Clean and dry surfaces beyond full width of joint.
1.3. Sealing: Weld together.
2. Seam sealant: As membrane manufacturers recommendations.
3. Condition at completion: Fully sealed, smooth, weatherproof and free draining.
760 Perimeter of membrane

1. General: Secure membrane at roof edge conditions, changes of plane, curb flashings, upstands
to roof lights, etc. with mechanical fasteners.
765 Perimeter details for thermoplastic membranes

1. Upstands, edge trims, drips, kerbs, etc.: Secure preformed metal sections to roof structure with
mechanical fasteners.
2. Roof membrane: Dress over perimeter profile. Overlap beyond fasteners by minimum 50 mm.
2.1. Sealing: Weld together.
Surfacing - Not Used

Completion
910 Inspection
1. Interim and final roof inspections: Submit reports.
940 Completion
1. Roof areas: Clean.
1.1. Outlets: Clear.
2. Work necessary to provide a weathertight finish: Complete.
3. Storage of materials on finished surface: Not permitted.
4. Completed membrane: Do not damage. Protect from traffic and adjacent or high level working.
Ω End of Section

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K11
Rigid sheet flooring/ sheathing/ decking/ sarking/ linings/
casings
Types of flooring/ sheathing/ decking/ sarking/ lining/ casings
795 A Wall lining on metal framing
1. Manufacturer: RCM - Roofing and Cladding Materials Ltd
1.1. Web: www.buildingboards.co.uk
1.2. Email: info@rcmltd.biz
2. Product Reference: Y–Wall
3. Size: 1200 x 2400 mm
4. Thickness: 12 mm
5. Accessories: RCM Foil Tape
6. Description: Flexible cement/ calcium building board
6.1. Nominal Density: 1200 kg/m³
6.2. Weight: 14.6 KG/m2
7. Fire performance
7.1. Reaction to fire: Class A1 reaction to fire to BS EN 13501-1 or better
8. Substrate: Existing metal light weight steel frame.
9. Fixing lining to supports
9.1. Fasteners: As manufacturers instructions using 41mm long self driving screws with a
10.4mm diameter head, 4.2mm diameter shaft.
10. Joint treatment: Fully tape all joints at completion using self adhesive aluminium foil tape
798 Render backing board of soffits on metal framing

1. Manufacturer: Siniat or equal approved
1.1. Web: www.siniat.co.uk/en
2. Product Reference: Siniat Bluclad Board
3. Size: 1200 x 2400 mm
4. Thickness: 10 mm
5. Description: Flexible cement/ calcium building board
5.1. Nominal Density: 1180 kg/m3
6. Fire performance
6.1. Reaction to fire: To BS EN 13501-1, Class A2-s1, d0
7. Substrate: Existing metal light weight steel frame.
8. Framing
8.1. Manufacturer: Contractor's choice. provide new support channels fitted to primary framing
ready to receive new lining boards and render finish.
9. Fixing lining to supports
9.1. Fasteners: As manufacturers instructions using 41mm long self driving s/s screws with a
10.4mm diameter head, 4.2mm diameter shaft.
10. Joints: 3mm gap
M D Bithrey Chartered Surveyors K11

Ltd Rigid sheet flooring/ sheathing/ decking/ sarking/ linings/
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Page 14 of 44
Workmanship
910 Installation generally
1. Timing: Building to be weathertight before fixing boards internally.
2. Moisture content of timber supports (maximum): 18%.
3. Joints between boards: Accurately aligned, of constant width and parallel to perimeter edges.
4. Methods of fixing, and fasteners: As section Z20 where not specified otherwise.
940 Board moisture content and conditioning

1. Moisture content of boards at time of fixing: Appropriate to end use.
2. Conditioning regime: Submit proposals.
960 Fixing generally

1. Boards/ sheets: Fixed securely to each support without distortion and true to line and level.
2. Fasteners: Evenly spaced in straight lines and, unless otherwise recommended by board
manufacturer, in pairs across joints.
2.1. Distance from edge of board/ sheet: Sufficient to prevent damage.
3. Surplus adhesive: Removed as the work proceeds.
975 Metal wall framing

1. Setting out: Framing accurately aligned, vertical and securely fixed to surrounding structure at
maximum 600 mm centres. All board edges supported.
976 Mineral wool insulation to metal framing

1. Installation: Neat and secure with butted joints and no gaps. Where insulation is not self-
supporting, fixed at head of frame using clips or other suitable proprietary fixings.
980 Open joints

1. Perimeter joints, expansion joints and joints between boards: Free from plaster, mortar droppings
and other debris.
2. Temporary wedges and packings: Removed on completion of board fixing.
990 Access panels

1. Size and position: Agree before boards are fixed.
2. Additional noggings/ dwangs (Scot), battens, etc.: Provide and fix as necessary.
Ω End of Section
M D Bithrey Chartered Surveyors K11

Ltd Rigid sheet flooring/ sheathing/ decking/ sarking/ linings/
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M21
Insulation with rendered finish
General/ system requirements
120 Survey of structural substrate
1. Timing: Before starting work covered in this section.
2. Objective: To confirm suitability for application of external wall insulation system. This is to include
an assessment by the contractors own appointed Structural Engineer to ensure that the building
structure is capable of transferring the dead, imposed and wind loads to the ground safely.
3. Survey report: Submit, covering:
3.1. The form and condition of the structural substrate.
3.2. Structural Engineers Assessment to demonstrate that the existing building structure is
capable of transferring the dead, imposed and wind loads to the foundations. This section
must also be submitted by the contractor to the Approved Inspector.
3.3. Provide wind Loading assessment carried out to BS EN 1991-1-4: 2005 to the system
manufacturer to allow completion of fixing analysis.
3.4. Provide on-site pull-out test date to the system manufacturer to allow completion of the
fixing analysis.
3.5. A schedule of repairs and/ or additional works necessary to render the substrate suitable to
receive the system.
3.6. A schedule of services, fixtures and fittings requiring removal to facilitate installation of the
system.
3.7. Proposals for treatment of thermal bridges that may occur as a result of installing the
system, e.g. at door and window reveals, concrete floor edges, movement joints.
3.8. Any other relevant information.
160 Remedial work

1. Remedial work shown to be necessary by survey: Must be completed prior to installation of new
EWI system. Where defects are found seek instructions from C.A.
180 Structural substrate - Lightweight steel frame

1. Description: 150mm Lightweight Steel Frame (LWSF) with new 12mm RCM Y wall sheathing
board specified under clause K11/795a
2. Preparation: As stated in schedule of works
180 A Structural substrate - Masonry substrates

1. Description: Cast concrete and dense concrete block substrates in car park area.
2. Preparation: Drench apply weber CL150 wash and leave for 48 hours. Brush down to remove all
moss/growth. Make good bossed areas using weberend aid and weberend TUC to achieve an in-
plane surface.
210 A External wall insulation system - To new sheathing board

1. Manufacturer: Saint-Gobain Weber
1.1. Web: www.uk.weber
1.2. Email: mail@netweber.co.uk
1.3. Specification manager: Julian Still Email: julian.still@netweber.co.uk Tel: 07976158094
2. Product reference: webertherm XM FM224P (High Rise) an external wall insulation system for
use in areas of high exposure. The system is mechanically fixed to the substrate using suitable
M D Bithrey Chartered Surveyors M21
Ltd Insulation with rendered finish
14-03-2021 Page 16 of 44
fixings at the specified rate (determined by onsite pull out test/wind load calculations). Refer to
Clause 120, 416A and 440. webertherm XM FMR (MFD) is protected with a 6mm thick
meshcloth reinforced coat of weberend LAC rapid, which gives ‘Category II' impact resistance
and good weather protection, and a coat of webersil TF textured finish.
3. Building height: 20m maximum
4. Preparation: As schedule of works
5. Fire classification: Reaction to Fire (system): Classification when part of webertherm XM
comprising of webersil TF = A2 – s1, d0 classified in accordance with BS EN 13501-1.
6. Impact resistance: Category ii (ETAG 004) See clause 335A
7. Wall substrate: New 12mm RCM Y wall linings as clause K11/795a
8. Secondary weathering's to substrate: EPDM to openings and penetrations as clause P10/311
9. Breather membrane: Tyvek Firecurb as clause P10/320A
10. Insulation:
10.1. Type: webertherm MFD (Mineral fibre duel-density) insulation slabs. Euro class A1 (non-
combustible)
10.2. Thickness: Thickness varies to some locations but is typically 100mm
10.3. Fixings: EJOT SW8-R Fixing - self drilling case hardened carbon steel with Climadur organic
coating. Shaft diameter 4.8mm, head diameter 12mm used in conjunction with EJOT SBH-T
65/25 washer (65mm diameter polyethylene fixing head
10.3.1. Fixing number & spacing: To be confirmed on-site by pull out tests in accordance with
BS EN 1991-1-4: 2005
10.4. Density: Nominal Density: First 15mm 160kg/m³ Balance 100kg/m³
10.5. Compressive strength: (at 10% deformation): ≥40kN/m2
10.6. Thermal conductivity: 0.036 W/mK. CFC/HCFC free
10.7. Vapour resistivity: ≥ 5.9MNs/gm
10.8. Initial restraining fixings: Where required to be confirmed via pull-out data
10.9. Fixings through meshcloth coat: If required to be confirmed by fixing analysis
10.10. Fire Fixings: Provide 1 per m² (Stainless Steel)
10.11. Glass fibre reinforcement: webermesh woven glass reinforcing mesh 3.8 x 3.5mm
with a polymer coating and nominal weight of 160g/m2. Use webermesh heavy duty to
anticipated high impact areas - Defined for the purposes of this tender as all surfaces
accessible from adjacent ground areas and balcony decks.
10.12. Adhesive: Not required as mechanical fix only
11. Sealant joints: Low modulus silicone
12. Movement joints: Replicate all movement, expansion, deflection and structural joints. Where
possible locate horizontal expansion joints behind balcony frames and other features
13. Render:
13.1. First coat: weberend LAC Rapid - polymer modified cementitious basecoat mortar applied in
two passes for overall thickness of 6mm at a rate of 6.5kgm2 as clause 416A.
13.2. Finishing coat:
13.2.1. Type: webersil TF - Silicone bonded textured render applied at a rate of 2.7kg/m2.
Thickness 1.5mm - stippled finish as clause 417A.
13.2.2. Colour: White to match existing - submit samples for approval
13.2.3. Render thickness: Overall thickness 7.5mm (minimum)
14. Accessories/ Other requirements: The contractor must comply with the manufacturers standard
details and installation instructions. Whilst selection of appropriate details is is the contractors
design responsibility the following site specific details and requirements should to be reflected in
contractors design.

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14.1. Base bead detail: Provide Full system base bead (Aluminium box profile
with clip on nosing) to base of render as detail K-02-15 over retained rendered insulation
below DPC
14.2. Beads: Render only drip and corner beads to be plastic.
14.3. Window head detail: Insulated heads with render only plastic stop bead and mastic as detail
K-07-03
14.4. Window reveal detail: Insulated reveals with render only plastic stop bead and mastic as
detail K-06-03
14.5. Compression joints: Proprietary three-part, render only horizontal movement joint bead
(includes render only) drip bead as detail K-08-11
14.6. Vertical movement joint: Proprietary render only movement bead as detail K-09-11
14.7. Step in insulation system: As detail K-08-14. Aluminium profile as schedule of works.
14.8. Abutment details: Render only stop bead with mastic seal as detail K-09-41
14.9. Coping detail: As detail K11-11
14.10. Roof junction: As detail K-11-21
14.11. Compressible sealing tape: As recommended by EWI manufacturer.
210 B Thin render system to substrate board - Rendered soffit areas

2. Product reference: Weberend MTR 124P
3. Render substrate board: Siniat Bluclad as clause K11/798
4. Preparation: As schedule of works
5. Fire classification: Reaction to Fire (system): Classification when part of weberend MT comprising
of Weberend LAC rapid/webersil TF = A2 – s1, d0 classified in accordance with BS EN 13501-1.
7. Finish: webersil TF textured finish to suit adjacent EWI areas.
8. Sealant joints: Low modulus silicone where required
9. Render:
9.1. Reinforcement coat: weberend LAC Rapid - polymer modified cementitious basecoat mortar
applied in two passes for overall thickness of 6mm at a rate of 6.5kgm2 as clause 416A.
9.2. Reinforcement: webermesh standard. Standard duty, balanced, open weave, glass fibre
meshcloth, coated for alkaline resistance, in 1m x 50m roll
9.3.1.Type: webersil TF - Silicone bonded textured render applied at a rate of 2.7kg/m2.
Thickness 1.5mm - textured finish as clause 417A.
9.3.2.Colour: White to match existing - submit samples for approval
9.3.3.Render thickness: Overall thickness 7.5mm (minimum)
10. Support frame:
10.1. Existing: Existing metal frame structure including support rails. Contractor to assess
suitability following removal of existing finishes as specified to receive new render substrate
boards in accordance with manufacturers recommendations.
10.2. Support frame requirements: Provide an in-plane and of adequate thickness for appropriate
support and stiffness (limit mid span deflections L/200 and cantilever deflections to L/150.
Board mid-span deflections should be limited to L/500) to receive weberend MT reinforced

14-03-2021 Page 18 of 44
render system within the stated deflection limits or edge protrusions. Contact Weber for an
up to date list of recommended boards tested for this system.
contractors design.
210 C External wall insulation system - To masonry walls in underground car

park
2. Product reference: webertherm XM FM224 external wall insulation system. The system is fully
adhesive bonded and mechanically fixed to the substrate using suitable fixings at the specified
rate (determined by onsite pull out tests). Refer to Clause 440 and 416A. webertherm XM FMR
(MFD) is protected with a 6mm thick meshcloth reinforced coat of weberend LAC rapid, which
gives ‘Category II' impact resistance and good weather protection, and a coat of webersil TF
textured finish. - 30 Year System Required
3. Building height: N/A - Underground carpark walls
4. Preparation: Weber CL150 Fungicidal Masonry Wash as clause 180A.
5. Fire classification: Reaction to Fire (system): Classification when part of webertherm XM
comprising of webersil TF = A2 – s1, d0 classified in accordance with BS EN 13501-1.
7. Insulation:
7.1. Type: webertherm MFD (Mineral fibre duel-density) insulation slabs. Euro class A1 (non-
combustible)
7.2. Thickness: Thickness varies to some locations but is typically 100mm
7.3. Fixings: As recommended by manufacturer and detailed on BBA Certificate 91/2691 Product
Sheet 3.
7.3.1.Fixing number & spacing: To be confirmed on-site by pull out tests in accordance with
BS EN 1991-1-4: 2005
7.4. Density: Nominal Density: First 15mm 160kg/m³ Balance 100kg/m³
7.5. Compressive strength: (at 10% deformation): ≥40kN/m2
7.6. Thermal conductivity: 0.036 W/mK. CFC/HCFC free
7.7. Vapour resistivity: ≥ 5.9MNs/gm
7.8. Initial restraining fixings: Where required to be confirmed via pull-out data
7.9. Fixings through meshcloth coat: If required to be confirmed by fixing analysis
7.10. Fire fixings: Provide 1 per m² (Stainless Steel)
7.11. Glass fibre reinforcement: Use webermesh heavy duty throughout car park areas.
7.12. Adhesive: weberend LAC Rapid
8. Sealant joints: Low modulus silicone
9. Movement Joints: Replicate all movement, expansion, deflection and structural joints.
10. Render:

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10.1. First coat: weberend LAC rapid - polymer modified cementitious basecoat mortar applied in
two passes for overall thickness of 6mm at a rate of 6.5kgm2 as clause 416A.
10.2.1. Type: webersil TF - Silicone bonded textured render applied at a rate of 2.7kg/m2.
Thickness 1.5mm - textured finish as clause 417A
10.2.2. Colour: White to match existing - submit samples for approval
10.2.3. Render thickness: Overall thickness 7.5mm (minimum)
contractors design.
11.1. Base bead detail: Provide Full system base bead (Aluminium box profile
with clip on nosing) to base of render as detail K-02-15 over retained rendered insulation
below DPC
11.3. Door head detail: Insulated heads with render only plastic stop bead and mastic as detail K-
07-03
11.4. Door reveal detail: Insulated reveals with render only plastic stop bead and mastic as detail
K-06-03
11.5. Vertical movement Joints: Proprietary render only movement bead as detail K-09-11
307 Completion of design

1. Description: For EWI system to all areas
2. Description: The contractor shall utilise the manufacturers standard installation details and shall
novate said details to provide a full pack of site specific design details for C.A approval.
3. Requirement: Complete the detailed design to satisfy specified performance criteria and
coordinate with the detailed design of related and adjacent work.
4. Structural requirements: N/A.
5. Additional requirements: The contractor shall within their design detail upon the elevation
drawings provided the proposed location of Movement joints for C.A approval. Where required
such joints should where possible be located behind building features to minimise their visual
impact
6. Design and production information: As Preliminaries section A31
7. Timing of submissions: As Preliminaries section A31
335 A Impact resistance

1. Hard body impact loads
1.1. Category: Category II ETAG 004 Table 8
360 Samples
1. Procedure: Submit samples/ examples of designated items for approval. Keep approved samples
on site for the duration of the contract for inspection/ comparison purposes.
2. Designated items: Texture of proposed finish; 1m2 panel
380 Uniformity of colour and texture of coating mixes

1. Type/ proportion of constituent materials: Unchanged once samples of coatings have been
approved.

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2. Supplies of materials: Sufficient to give consistent and uniform colour and texture.
Installation
410 A Installation
1. Installer: The system manufacturer, or a contractor approved by the system manufacturer and
registered as a High Rise installer with SWIGA taken from the list of accredited installers
appended to the specification.
2. System installation: To be in strict accordance with Saint-Gobain Weber specification, typical and
bespoke details and installation/application guide for weberthem XM system. Consult with Saint
Gobain for latest literature.
3. SWIGA guarantee: Obtain and provide a 10 year insurance backed warranty for the works to
facade areas from SWIGA. (Exclude car park areas) The contractor must ensure full compliance
with any additional requirements as set out by SWIGA over and above those required by the
system manufacturer.
415 A Insulation
1. Within car park areas mix and apply weberend LAC rapid to back of the webertherm insulation.
weberend LAC rapid should be combed with a suitable 8mm notched trowel to allow bedding.
Break bond and butt joint webertherm insulation boards and position board on wall, press into
position to reconcile edges and as far a reasonably practicable ensure full contact and positive
adhesion.
2. Mechanically fix each slab with the specified number of fixings in the specified pattern in to the
masonry substrate to required depth using Weber specified fixings in accordance with Weber
specified pattern.
3. Additional fixings will be required through the mesh cloth coat; pattern must be confirmed with
Saint-Gobain Weber before work commences. Number and location of fixings may vary upon
receipt of wind loading criteria and calculation of fixing analysis.
416 A Reinforcing Coat

1. Mix 20kg of weberend LAC rapid with approximately 5 litres potable water and apply 2-3mm
thick incorporating weber meshcloth standard glass fibre meshcloth as specified. Insert specified
system fixings through the meshcloth at the specified rate then cover the fixing heads with a
meshcloth patch (nominal 100 x 100mm). Allow for partial take-up then apply further 3mm to form
a nominal 6mm thick monolithic coat. weberend LAC rapid must be finished with a sponge float;
leaving the work flat off the trowel or finishing with a spatula or steel trowel will inhibit bond of the
two materials.
2. For temperatures between 12oC and 30oC, a period of 24 hours must pass before progressing
with the system installation from the finishing of the weberend LAC rapid to the application of
finish coat. Longer curing periods, minimum 48 hours, will be necessary for temperatures
between 5oC and 12oC. Do not apply in temperatures below 5°C or above 30°C.
3. Fixing pattern must be confirmed with Saint Gobain Weber before work commences. Number and
location of fixings may vary upon receipt of wind loading criteria and calculation of fixing analysis
417 A Finishing Coat

1. Apply and work webersil TF to an acceptable texture using a stainless steel / thin plastic float, all
in accordance with manufacturer's printed instructions.
420 Adverse weather

1. Materials/ surfaces: Do not use frozen materials and do not apply materials to frost-bound
surfaces.
2. Adhesives/ mortars/ renders: Do not apply when air temperature is:

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2.1. At or below 5°C on a falling thermometer or below 3°C on a rising thermometer, or when
temperature of the air or wall surface is above 30°C and the surface is not protected.
2.2. Outside range recommended by manufacturer, if different from above.
3. Temperature of the work: Maintain above minimum level recommended by manufacturer until
adhesive/ mortar/ render has fully hardened.
4. Newly rendered surfaces: Protect against adverse weather conditions.
5. Render coatings damaged by adverse weather: Replace.
429 A Site Storage

1. Site storage and protection of Saint-Gobain Weber materials must be in accordance with the
manufacturer’s instructions.
430 Substrates
1. Condition before pretreatment/ application of insulation system: Structurally sound, adequately
true and level, dry, free from contamination by dirt, dust, efflorescence, organic growths or other
deleterious substances and in a suitable condition to receive specified insulation system.
2. Board Substrates: Must be clean, sound and dry and securely fitted to support frames without
deflection.
435 Removal of existing components

1. Requirement: Remove all necessary components as detailed upon the schedule of works.
440 On-site pull-out tests on fixing pins

1. Objective: To prove suitability of structural substrate and determine size and number of fixings
required.
2. Pull-out test load: 2 x design load
3. Notice: Give notice of testing timetable to Contract administrator.
3.1. Period of notice: Five working days
449 A Admixtures
1. Do not use admixtures of any type with proprietary mixes unless otherwise instructed by Saint
Gobain Weber.
459 A Contamination
1. Do not allow contamination of one type of material by another, or by any set material.
2. Only use clean cold water and mix in non-contaminated mixing tubs. Ensure only full bags are
used when mixing.
461 A Mixing
1. Mixing for weberend products are as follows: Use only materials directed in correct quantity.
Discard suspect materials, which are damp or contaminated. Don't over mix. Only mix sufficiently
to combine materials - then use immediately. Once material has been mixed do not attempt to re-
temper it to a workable consistency by adding more water.
481 A Initial Set

1. Do not use mixes after initial set has taken place. Do not re-temper or reconstitute mixes.
490 Construction/ movement joint installation

1. Location: Coincident with movement joints in substrate and at abutments with dissimilar materials.

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2. Formation: Accurately to bridge joint, with a constant projection.

3. Modifications to joint locations/ design: Agree revisions before proceeding.
520 Supports/ sleeves for services/ fittings

1. Service/ fitting: Lightweight items, maximum 5kg static load, such as: CCTV cameras, Security
lighting, Intercom units, Rainwater pipes, Soil pipes
2. Type of support: Spiral Fixings, static loads up to 5kg only, installed as shown on Typical Details.
Position to be marked to avoid drilling through render finish.
3. Service / Fitting: Heavy Items: Hanging baskets, Satellite dishes, TV aerials, cast iron rain pipes
and the like.
4. Type of support: Fixing brackets as shown on Typical Details or in accordance with supplier
recommendations. Position to be marked to avoid drilling through render finish
530 Sealant joints

1. Locations: At junctions with dissimilar materials
2. Sealant: Low modulus silicone
3. Joints: Formed in accordance with section Z22 and system manufacturer's recommendations
using any necessary joint fillers, backing strips, etc.
540 A Curing
1. Allow undercoats to dry out thoroughly before applying subsequent coats.
2. Take all necessary precautions to prevent newly rendered surfaces from drying out too rapidly.
3. Protect from frost.
550 Inspection of completed installation

1. Timing: As soon as possible after completion of the work and before removing scaffolding.
2. Notice for inspection (minimum): Five working days Three working days
3. Submit : Description of inspection and remedial works carried out.
Ω End of Section

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M60
Painting/clear finishing
Coating systems
130 Gloss paint
1. Description: Rain pipes to West Block
2. Manufacturer: Sherwin Williams Tel: 01204 521771 or email paula.williams@sherwin.com or
equal approved.
2.1. Product reference: Acrolon 7300 Gloss or Semi Gloss high performance fast drying two
pack acrylic urethane gloss
3. Surfaces: Cast Iron Pipe and hoppers
3.1. Preparation: Areas of damage which exhibit surface rusting shall be prepared by mechanical
means to ensure all residual rust is removed to BS EN ISO 8501-1:2007 Grade St3.
Surrounding paint coatings shall be removed back to a firm sound edge and then feathered
over a distance of 50mm in the region of the affected area
4. Initial coats: Prime bare areas using Macropoxy M902 brushing aluminium primer. Note: For older
cast iron pipes stippling on the M902 will aid adhesion.
4.1. Number of coats: As neccessary to suit existing dry film thickness
5. Undercoats: Macropoxy M905 high build undercoat
5.1. Number of coats: Dry Film Thickness: 100 microns nominal as defined in BS EN ISO 12944-
5
6. Finishing coats: Acrolon 7300 Gloss
6.1. Number of coats: Dry Film Thickness: 50-75 microns nominal as defined in BS EN ISO
12944-5
6.2. Colour: Black to match existing.
200 Chemical clean to powder coated aluminium

1. Description: Following completion of test sample panel and approval from C.A allow to clean all
pre-finished existing retained external powder coated aluminium frames and cladding as detailed
below:
2. Manufacturer: Tensid uk plc. Aquila House, 70a Wheatash Road, Addlestone, Surrey KT15 2ES.
Tel No: 01932 564133. Fax No: 01932 562046 E-mail info@tensid.com Web: www.tensid.com or
equal approved
2.1. Product reference: Cladex LD diluted with water 1:1 or equal approved.
3. Surfaces: Powder coated aluminium.
3.1. Preparation: Protect surrounding surfaces and avoid wind drift.
4. Test Panel: As Clause 310
5. Application: Establish the strength of cleaner required with the use of test panels, dilute with up to
5 parts water to one part concentrate as required. Apply as manufacturers instructions.
6. Rinse Clean: Rinse cleaning to be undertaken in accordance with the manufactures instructions.
Typically, large surface areas (away from windows and/or openings) to be pressure washed
whereas framed areas or locations in proximity to windows and/or openings to be wiped down by
hand.
7. Lime/calcium deposits: Clean locally using Cladex AC to remove .
8. Completion: Contractor to use Cladex Restore acrylic polymer in accordance with manufacturers
instructions.

Ltd Painting/clear finishing
14-03-2021 Page 24 of 44
Generally
215 Handling and storage
1. Coating materials: Deliver in sealed containers, labelled clearly with brand name, type of material
and manufacturer's batch number.
2. Materials from more than one batch: Store separately. Allocate to distinct parts or areas of the
work.
220 Compatibility
1. Coating materials selected by contractor
1.1. Recommended by their manufacturers for the particular surface and conditions of exposure.
1.2. Compatible with each other.
1.3. Compatible with and not inhibiting performance of preservative/fire-retardant pretreatments.
240 Surfaces not to be coated

1. Decoration is limited to redecoration of the existing rain pipes and hoppers to the flank and rear
elevations of the West Stand. All other facade elements are not to be coated..
250 Surfaces to be cleaned but not coated

1. Pre-Finished powder coated aluminium window and door Frames and cills and any retained
powder coated aluminium cladding are to be chemically cleaned as detailed under clause 200
subject to satisfactory completion of test panel as clause 310 below.
280 Protection
1. 'Wet paint' signs and barriers: Provide where necessary to protect other operatives and general
public, and to prevent damage to freshly applied coatings.
300 Control samples

1. Sample areas of finished work: Carry out, including preparation, as follows:
2. Location/Extent: L/L section of rain pipe to be prepared to reflect the three main stages of work as
defined below for C.A approval:
2.1. Preparation: Prepare and spot prime bare metal as clause 130
2.2. Undercoat: As Clause 130
2.3. Finish: As Clause 130
3. Approval of appearance: Obtain before commencement of general coating work.
310 Supervised control samples

1. Sample areas of finished work: Carry out, including preparation, as follows:
2. Chemical Cleaning: Existing powder coated window frames to be cleaned down as clause 200.
Contractor to establish strength using a 1:1 dilution of the Cladex LD with water.
3. Inspection: Give minimum 5 working days notice of specialist contractor attendance for sample
panels. Cleaning is to be completed under the supervision of the C.A with reference to the
manufacturers requirements.
4. Approval of appearance: Obtain and seek instructions before undertaking further specialist
cleaning works.
320 Inspection by coating manufacturers

1. General: Permit manufacturers to inspect work in progress and take samples of their materials
from site if requested.
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321 Inspection of work stages

1. Programme for inspections: Submit as follows:
2. Types of coating Inspection at completion of
3. M60/ 130. Preparation of substrate with a further inspection following application of undercoat.
4. Inspection: Give prior notice when each stage is ready for inspection.
Preparation
400 Preparation generally
1. Standard: In accordance with BS 6150.
2. Refer to any pre-existing CDM Health and Safety File.
3. Refer to CDM Construction Phase Plan where applicable.
4. Suspected existing hazardous materials: Prepare risk assessments and method statements
covering operations, disposal of waste, containment and reoccupation, and obtain approval
before commencing work.
5. Preparation materials: Types recommended by their manufacturers and the coating manufacturer
for the situation and surfaces being prepared.
6. Substrates: Sufficiently dry in depth to suit coating.
7. Efflorescence salts: Remove.
8. Dirt, grease and oil: Remove. Give notice if contamination of surfaces/ substrates has occurred.
9. Surface irregularities: Remove.
10. Joints, cracks, holes and other depressions: Fill flush with surface, to provide smooth finish.
11. Dust, particles and residues from preparation: Remove and dispose of safely.
440 Previously coated surfaces generally

1. Preparation: In accordance with BS 6150, clause 11.5.
2. Contaminated or hazardous surfaces: Give notice of:
2.1. Coatings suspected of containing lead.
2.2. Substrates suspected of containing asbestos or other hazardous materials.
2.3. Significant rot, corrosion or other degradation of substrates.
3. Suspected existing hazardous materials: Prepare risk assessments and method statements
covering operations, disposal of waste, containment and reoccupation, and obtain approval
before commencing work.
4. Removing coatings: Do not damage substrate and adjacent surfaces or adversely affect
subsequent coatings.
5. Loose, flaking or otherwise defective areas: Carefully remove to a firm edge.
6. Alkali affected coatings: Completely remove.
7. Retained coatings
7.1. Thoroughly clean to remove dirt, grease and contaminants.
7.2. Gloss-coated surfaces: Provide key.
8. Partly removed coatings
8.1. Additional preparatory coats: Apply to restore original coating thicknesses.
8.2. Junctions: Provide flush surface.
9. Completely stripped surfaces: Prepare as for uncoated surfaces.
490 Previously coated steel

1. Defective paintwork: Remove to leave a firm edge and clean bright metal.
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2. Sound paintwork: Provide key for subsequent coats.

3. Corrosion and loose scale: Take back to bare metal.
4. Residual rust: Treat with a proprietary removal solution.
5. Bare metal: Apply primer as soon as possible.
6. Remaining areas: Degrease.
622 Organic growths

1. Dead and loose growths and infected coatings: Scrape off and remove from site.
2. Treatment biocide: Apply appropriate solution to growth areas and surrounding surfaces.
3. Residual effect biocide: Apply appropriate solution to inhibit re-establishment of growths.
640 External pointing to existing frames

1. Defective sealant pointing: Remove.
2. Joint depth: Approximately half joint width; adjust with backing strip if necessary.
3. Sealant
3.1. Manufacturer: Geocel Ltd or equal approved
3.1.1.Product reference: Dow Corning 796 Sealant or equal approved
3.2. Preparation and application: As section Z22.
651 A Existing Hoppers

1. Dirt and debris: Remove from inside of gutters.
2. Defective joints: Clean and seal with suitable jointing material.
Application
711 Coating generally
1. Application standard: In accordance with BS 6150, clause 9.
2. Conditions: Maintain suitable temperature, humidity and air quality during application and drying.
3. Surfaces: Clean and dry at time of application.
4. Thinning and intermixing of coatings: Not permitted unless recommended by manufacturer.
5. Overpainting: Do not paint over intumescent strips or silicone mastics.
6. Priming coats
6.1. Thickness: To suit surface porosity.
6.2. Application: As soon as possible on same day as preparation is completed.
7. Finish
7.1. Even, smooth and of uniform colour.
7.2. Free from brush marks, sags, runs and other defects.
7.3. Cut in neatly.
Ω End of Section

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N16
Bird and vermin control systems
General
110 Bird control
1. Description: West stand high level stepped ledges in location of existing bird spikes.
2. Species: Feral pigeon
3. System manufacturer: Contractor's choice. Submit design and cost proposals
4. Detection: None
5. Prevention: Roost inhibitors, spikes as clause 340
6. Other requirements: Sealant for fixing as clause 400
System performance
210 General requirements
1. Standard: In accordance with BPCA members' information manual
1.1. Documentation. Submit certification of training and experience for operatives.
2. Survey: Identify nature, source and extent of infestation and/ or damage.
3. Report content
3.1. List pest species detected.
3.2. Factors affecting execution of the work: Identify problematic site conditions and restrictions,
including the presence of protected species.
3.3. Associated work: Identify nature of repair and/ or replacement work required to building
fabric in order to avoid re-infestation
3.4. Other contaminants: Notify.
4. Control measures: Submit proposals for:
4.1. Prevention measures.
5. Proposals: Include:
5.1. Drawings, schedules, technical information, calculations and manufacturers’ literature.
5.2. Method statements.
5.3. Maintenance procedures and logbook.
6. Mesh, nets, roost inhibitors, traps and guards: Capable of resisting temporary and permanent
loads.
Products
340 Roost inhibitors
1. Description: Bird spikes
2. Manufacturer: Contractor's choice
3. Material: Composite plastics base with galvanized carbon steel spikes
3.1. Number of rows: 1
3.2. Special fixings: None
4. Installation: Silicone adhesive bonded as clause 400 and section Z22 generally to new powder
coated aluminium capping's to ledges
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400 Sealant
1. Description: To bond pigeon spikes detailed under clause 340 to substrate.
2. Type: Silicone
3. Manufacturer: Contractor's choice
4. Colour: White
Fabrication - Not Used

Execution
610 Workmanship generally
1. Preparation
1.1. Water supplies: Do not contaminate.
1.2. Existing building services and components: Protect, and leave undamaged.
2. Timing: Coordinate with other related trades.
3. Damaged building components: Obtain instructions.
4. Contaminants: Remove and leave affected area clean.
5. Coatings
5.1. Suitability of substrates: Sufficiently dry and sound, to suit coatings.
5.2. Preparation and application: As section M60, and in accordance with BS 6150.
6. Fasteners and adhesives: As section Z22.
6.1. Material: Compatible with building components and substrate.
6.2. Metals: Isolate dissimilar metals to avoid electrolytic corrosion.
7. Thermal and building movement: Allow for, where appropriate.
7.1. Movement joints: Do not bridge.
8. Roost inhibitors, nets and mesh screens: Correctly fitted and tensioned.
620 Decontamination
1. Bird droppings and other detritus: Remove.
Completion
940 Documentation
1. General: Submit:
1.1. Manufacturer’s maintenance instructions.
1.2. Recommendations for measures to prevent re-infestation.
1.3. General product information.
1.4. Installation information.
1.5. Guarantees, warranties, test certificates, record schedules and log books.
2. Number of copies: Two
3. Submission: 2 weeks prior to date when principal contractor expects work to be practically
complete
Ω End of Section
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P10
Sundry insulation/ proofing work
Types of insulation
190 A Insulation fitted between LWSF
1. Manufacturer: Knauf Insulation Ltd.
1.1. Web: www.knaufinsulation.co.uk.
1.2. Email: technical.uk@knaufinsulation.com.
2. Product Reference: Earthwool® Flexible Slab.
3. Thickness: 140 mm.
4. Material: Rock wool to BS EN 13162.
4.1. Facing: Not required.
4.2. Slab Size: 1200 x 600mm.
5. Fire Classification: Euroclass A1 to BS EN ISO 13501-1.
6. Thermal Conductivity: 0.037 W/mK
7. Installation requirements
7.1. Joints: Butted, no gaps.
7.2. Fasteners: Use where necessary to retain insulation and/ or prevent slumping.
217 Insulation slabs fixed to new sheathing boards

1. Manufacturer: ROCKWOOL Ltd
1.1. Web: www.rockwool.co.uk
1.2. Email: info@rockwool.com
2. Product Reference: Rainscreen Duo-Slab
3. Thickness: 75 mm unless otherwise stated within the schedule of works.
4. Material: Rock wool to BS EN 13162 Dual density.
4.1. Sheet Size: 1000 x 600mm
4.2. Fire Classification: A1 to BS EN 13501-1.
4.3. Thermal Conductivity: 0.034 W/m·K.
5.1. Joints: Butted, no gaps. Fit insulation tightly between/ around cladding supports. Fill all voids
within insulation zone.
5.2. Fasteners: Stainless steel with minimum 70 mm diameter retaining head to centre and 1
matching polypropylene fixing top and bottom to horizontal joints as per the manufacturers
details.
218 Insulation slabs fixed to concrete walls and soffits

2. Product Reference: Rainscreen Duo-Slab
3. Thickness: 100 mm
4. Material: Rock wool to BS EN 13162 Dual density.
4.1. Sheet Size: 1000 x 600mm
4.2. Fire Classification: A1 to BS EN 13501-1.
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4.3. Thermal Conductivity: 0.034 W/m·K.

5.1. Joints: Butted, no gaps.
5.2. Fasteners: Stainless steel with minimum 70 mm diameter retaining head. Number and
spacing of fasteners as per the manufacturers details to suit application.
219 Insulation slabs fixed to concrete frame

2. Product Reference: ROCKWOOL RWA45
3. Thickness: Allow 60 mm for tender purposes. Product must be installed between face of concrete
frame and back face of sheathing board under minimum 10mm compression. Contractor to check
void depths prior to order.
4. Facing: Plain, unfaced
5. Material: Rock wool to BS EN 13162.
6. Fire Classification: Euroclass A1 to BS EN 13501-1.
7. Thermal Conductivity: 0.035 W/mK.
8. Sheet Size: 1200 x 600mm. Cut into strips 300mm wide and install to face of concrete frame for
fire stopping to voids.
9.1. Joints: Butted, no gaps. Fit insulation tightly between/ around cladding supports.
9.2. Fasteners: Stainless steel with minimum 70 mm diameter retaining head
311 EPDM Secondary weatherings

1. Description: To new sheathing board to SFS Frame to perimeter of all openings ad penetrations.
2. Manufacturer: Obexuk or equal approved.
2.1. Product reference: Cortex EPDM system or equal approved.
3. Material: 0860 EPDM membrane system adhesive fixed.
4.1. Width:: Minimum 250mm all round openings, 150mm to pipes and vents.
4.2. Method of fixing: Prime surfaces and adhesive fix and dress around all openings and
penetrating vents/pipes.
4.2.1.Primer:: Cortex 0787 Non-Flammable EPDM primer .
4.2.2.Adhesive:: 0765 Paste Adhesive.
4.3. Joints: At supports only, lapped 150 mm minimum.
4.4. Openings: Membrane fixed to frames and penetrations.
320 A Breather membrane

1. Manufacturer: DuPont Tyvek
1.1. Web: www.construction.tyvek.co.uk
1.2. Email: tyvek.construction@dupont.com
2. Product Reference: Tyvek Firecurb Housewrap
2.1. Type:: Flash-spun-bond HDPE with flame retardant coating.
2.2. Fire classification: (EN13501-1) - B-s1,d0 .
2.3. Dimensions/weight: 1.5m x 50m/5.5kg per roll.

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3. Accessories: Tyvek® Double Sided Tape, Tyvek® FlexWrap NF and Tyvek® Butyl Tape as
detailed under installation requirements.
4.1. Setting out: Joints minimized. Membrane to form a continuous barrier to prevent water,
snow and wind blown dust reaching the substrate.
4.2. Method of fixing: Tyvek® Butyl Tape to secure membrane to substrate.
4.3. Joints: Lapped 100 mm minimum horizontally and 150 mm minimum vertically. Joints taped
using Tyvek® Double Sided Tape.
4.4. Openings: Dress over EPDM secondary weathering's and tape seal using Tyvek® FlexWrap
NF
4.5. Bottom edges: Membrane lapped over flashings, sills, etc. to allow free drainage to the
exterior.
5. Penetrations: Dress over EPDM secondary weathering's and tape seal using Tyvek® FlexWrap
NF.
410 A Flexible cavity barriers

1. Location: Sub-divide the voids above the soffit lining to underpass areas.
3. Product Reference: ROCKWOOL Fire Barrier
4. Thickness: 60 mm
5. Width: 1000 mm
6. Length: To suit void depth detailed in schedule of work
7. Facing: Plain
8. Mesh: 2 sides
9. Accessories: ROCKWOOL Fire Barrier Angle Support and ROCKWOOL Fire Barrier Clamping
Plate
10. Fire resistance rating: To BS EN 13501-2, EI 60
11.1. Spacing: Installed in voids so the maximum unobstructed dimension in any direction is 10 m.
11.2. Fixing: Secure at perimeters and joints with no gaps, to provide a complete barrier to smoke
and flame.
11.3. Installation:: Install and secure top and bottom using Rockwool Fire Barrier Angle Support
and Clamping Plate as manufacturers instructions.
432 Cavity barriers

1. Manufacturer: Siderise Group or equal approved.
1.1. Product reference: RV 90/60
1.2. Type: Full fill barriers with leading edge fitted against separate OSCI vertical insert installed
under 10mm compression.
3. Length: 1200mm
4. Thickness: 90 mm
4.1. Installation requirements: Continuous, with minimum joints.
4.2. Fasteners: 3nr B195 Siderise support brackets fixed at maximum 600 centres.
4.3. Joints:: Tightly butt joints and overlay joints using SIDERISE foil tape RFT 120/45.

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5. Other requirements: Install Cavity barrier to substrate. Install OSCI insert to the inside face of the
panel allowing to compress into tray returns ensuring alignment with vertical barrier . Oversize
section fitted to wall to ensure smaller section to panel is installed under 10mm compression in
full accordance with manufacturers instructions.
435 Ventilated cavity barriers

1. Manufacturer: Siderise Group or equal approved.
1.1. Product reference: RH25G 90/60 to provide 25mm ventilation gap with galvanised steel
brackets.
1.2. Type: Open State with continuous high performance intumescent strip to leading edge fitted
against separate 50mm thick OSCI horizontal insert.
2. Material: Aluminium foil faced non-combustible stonewall lamella core with Intumescent face.
3. Length: 1200mm
4. Thickness: 90mm
6. Free air provision: 25mm
7. Installation requirements: Install Cavity barrier to substrate. Install OSCI insert to the inside face
of the panel allowing to compress into tray returns ensuring alignment with horizontal barrier in full
accordance with manufacturers instructions.
7.1. Fasteners: 3nr RS350G Siderise support brackets fixed at maximum 400 centres
7.2. Joints:: Tightly butt joints and overlay top surface of joints using SIDERISE foil tape RFT
120/45.
8. Other requirements: Where required notch to vertical framework ensuring continuity of the
intumescent seal across the face of the metal frame.
437 Ventilated cavity barriers Type B

1. Manufacturer: Tenmat or equal approved.
1.1. Product reference: Fix FF102/50 installed with non-combustible stainless steel nails or
screws.
1.2. Type: Open State intumescent strip mechanically fixed to substrate.
2. Material: The FF102/50 Ventilated Fire Barrier is a rigid, high expansion intumescent strip
encased in aluminium foil. The FF102/50 can be mechanically fixed both horizontally and
vertically within ventilated cavities behind rainscreen or cladding systems to act as a cavity fire.
3. Size: 75mm wide x 1000mm long x 6mm thick
5. Free air provision: 19mm
6. Installation requirements: Mechanical fix to sheathing board through breather membrane using
non-combustible stainless steel screws at max 250mm centres to the centreline of the barrier.
Max screw head diameter to be 11.5mm.
6.1. Joints:: Tightly butt joints.
Ω End of Section

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Z11
Purpose made metalwork
To be read with preliminaries/ general conditions.
310 Materials generally
1. Grades of metals, section dimensions and properties: To appropriate British Standards. When not
specified, select grades and sections appropriate for the purpose.
2. Prefinished metal: May be used if methods of fabrication do not damage or alter appearance of
finish, and finish is adequately protected.
3. Fasteners: To appropriate British Standards and, unless specified otherwise, of same metal as
component being fastened, with matching coating or finish.
410 Aluminium alloy products

1. Designations
1.1. Designation system, chemical composition and forms: To BS EN 573-1, -2, -3 and -5.
1.2. Temper designations: To BS EN 515.
2. Sheet, strip and plate: To BS EN 485-1 to -4.
3. Cold drawn rods, bars and tubes: To BS EN 754-1 and -2.
4. Extruded rods, bars, tubes and profiles: To BS EN 755-1 and -2.
5. Drawn wire: To BS EN 1301-1, -2 and -3.
6. Rivet, bolt and screw stock: To BS 1473.
7. Structural sections: To BS 1161.
Fabrication
515 Fabrication generally
1. Contact between dissimilar metals in components: Avoid.
2. Finished components: Rigid and free from distortion, cracks, burrs and sharp arrises.
2.1. Moving parts: Free moving without binding.
3. Corner junctions of identical sections: Mitre.
520 Cold formed work

1. Profiles: Accurate, with straight arrises.
525 Adhesive bonding

1. Preparation of surfaces of metals to receive adhesives
1.1. Degrease.
1.2. Abrade mechanically or chemically etch.
1.3. Prime: To suit adhesive.
2. Adhesive bond: Form under pressure.
527 Welding
1. Description: Aluminium cladding panel, capping's and flashing fabrications.
2. Welding procedures
2.1. Method and standard: TIG or MIG welding to BS EN 1011-4
2.2. Welding Procedure Specification (WPS): Not required
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3. Preparation
3.1. Joint preparation: Clean thoroughly.
3.2. Surfaces of materials that will be self-finished and visible in the completed work: protect
from weld splatter.
4. Jointing
4.1. Joints: Fully bond parent and filler metal throughout with no inclusions, holes, porosity or
cracks.
4.2. Dissimilar metals: Welding not permitted
4.3. Strength requirements: Welds to achieve design loads.
4.4. Heat straightening: Submit proposals
4.5. Complex assemblies: Agree priority for welding members to minimize distortion caused by
subsequent welds.
4.6. Tack welds: Use only for temporary attachment.
4.7. Jigs: Provide to support and restrain members during welding.
4.8. Filler plates: Submit proposals
4.9. Lap joints: Minimum 5 x metal thickness or 25 mm, whichever is greater.
4.10. Weld terminations: Clean and sound.
555 Brazing
1. Standard: To BS EN 14324.
2. Testing
2.1. Destructive testing: To BS EN 12797.
2.2. Nondestructive testing: To BS EN 12799.
Finishing
710 Finishing welded and brazed joints visible in complete work
1. Standard: To BS EN ISO 8501-3.
1.1. Preparation grade:
2. Butt joints: Smooth, and flush with adjacent surfaces.
3. Fillet joints: Neat.
4. Grinding: Grind smooth where indicated on drawings.
745 Preparation for application of coatings

1. General: Complete fabrication, and drill fixing holes before applying coatings.
2. Paint, grease, flux, rust, burrs and sharp arrises: Remove.
750 Liquid organic coating for aluminium alloy components

1. Standard: To BS 4842.
Completion
910 Documentation
1. Submit
1.1. Manufacturer's maintenance instructions.
1.2. Guarantees, warranties, test certificates, record schedules and log books.

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920 Completion
1. Protection: Remove.
2. Cleaning and maintenance: Carry out in accordance with procedures detailed in fabricators'
guarantees.
Ω End of Section

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Z20
Fixings and adhesives
Products
310 Fasteners generally
1. Materials: To have:
1.1. Bimetallic corrosion resistance appropriate to items being fixed.
1.2. Atmospheric corrosion resistance appropriate to fixing location.
2. Appearance: Submit samples on request.
320 Packings
1. Materials: Noncompressible, corrosion proof.
2. Area of packings: Sufficient to transfer loads.
330 Nailed timber fasteners

1. Nails
1.1. Steel: To BS 1202-1 or BS EN 10230-1.
1.2. Copper: To BS EN 1202-2.
1.3. Aluminium: To BS 1202-3.
340 Masonry fixings

1. Light duty: Plugs and screws.
2. Heavy duty: Expansion anchors or chemical anchors.
350 Plugs
1. Type: Proprietary types to suit substrate, loads to be supported and conditions expected in use.
360 Anchors
1. Types
1.1. Expansion: For use in substrate strong enough to resist forces generated by expansion of
anchor.
1.2. Adhesive or chemical
1.2.1.For use in substrate where expansion of anchor would fracture substrate.
1.2.2.For use in irregular substrate where expansion anchors cannot transfer load on anchor.
1.3. Cavity: For use where the anchor is retained by toggles of the plug locking onto the inside
face of the cavity.
370 Wood screws

1. Type
1.1. Wood screws (traditional pattern).
1.1.1.Standard: To BS 1210.
1.2. Wood screws.
1.2.1.Pattern: Parallel, fully threaded shank or twin thread types.
2. Washers and screw cups: Where required are to be of same material as screw.

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380 Miscellaneous screws

1. Type: To suit the fixing requirement of the components and substrate.
1.1. Pattern: Self-tapping, metallic drive screws, or power driven screws.
2. Washers and screw cups: Where required to be of same material as screw.
390 Adhesives
1. Standards
1.1. Hot-setting phenolic and aminoplastic: To BS 1203.
1.2. Thermosetting wood adhesives: To BS EN 12765.
1.3. Thermoplastic adhesives: To BS EN 204.
410 Powder actuated fixing systems

1. Types of fastener, accessories and consumables: As recommended by tool manufacturer.
Execution
610 Fixing generally
1. Integrity of supported components: Select types, sizes, quantities and spacings of fixings,
fasteners and packings to retain supported components without distortion or loss of support.
2. Components, substrates, fixings and fasteners of dissimilar metals: Isolate with washers/ sleeves
to avoid bimetallic corrosion.
3. Appearance: Fixings to be in straight lines at regular centres.
620 Fixing through finishes

1. Penetration of fasteners and plugs into substrate: To achieve a secure fixing.
630 Fixing packings

1. Function: To take up tolerances and prevent distortion of materials and components.
2. Limits: Do not use packings beyond thicknesses recommended by fixings and fasteners
manufacturer.
3. Locations: Not within zones to be filled with sealant.
640 Fixing cramps

1. Cramp positions: Maximum 150 mm from each end of frame sections and at 600 mm maximum
centres.
2. Fasteners: Fix cramps to frames with screws of same material as cramps.
3. Fixings in masonry work: Fully bed in mortar.
660 Screw fixing

1. Finished level of countersunk screw heads
1.1. Exposed: Flush with surface.
1.2. Concealed (holes filled or stopped): Sink minimum 2 mm below surface.
690 Using powder actuated fixing systems

1. Powder actuated fixing tools: To BS 4078-2 and Kitemark certified.
2. Operatives: Trained and certified as competent by tool manufacturer.

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700 Applying adhesives

1. Surfaces: Clean. Adjust regularity and texture to suit bonding and gap filling characteristics of
adhesive.
2. Support and clamping during setting: Provide as necessary. Do not mark surfaces of or distort
components being fixed.
3. Finished adhesive joints: Fully bonded. Free of surplus adhesive.
Ω End of Section

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Z22
Sealants
Products
310 Joints
1. Description: Sealant to perimeter of openings.
2. Primer, backing strip, bond breaker: Types recommended by sealant manufacturer.
Execution
610 Suitability of joints
1. Presealing checks
1.1. Joint dimensions: Within limits specified for the sealant.
1.2. Substrate quality: Surfaces regular, undamaged and stable.
2. Joints not fit to receive sealant: Submit proposals for rectification
620 Preparing joints

1. Surfaces to which sealant must adhere
1.1. Remove temporary coatings, tapes, loosely adhering material, dust, oil, grease, surface
water and contaminants that may affect bond.
1.2. Clean using materials and methods recommended by sealant manufacturer.
2. Vulnerable surfaces adjacent to joints: Mask to prevent staining or smearing with primer or
sealant.
3. Backing strip and/ or bond breaker installation: Insert into joint to correct depth, without stretching
or twisting, leaving no gaps.
4. Protection: Keep joints clean and protect from damage until sealant is applied.
630 Applying sealants

1. Substrate: Dry (unless recommended otherwise) and unaffected by frost, ice or snow.
2. Environmental conditions: Do not dry or raise temperature of joints by heating.
3. Sealant application: Fill joints completely and neatly, ensuring firm adhesion to substrates.
4. Sealant profiles
4.1. Butt and lap joints: Slightly concave.
4.2. Fillet joints: Flat or slightly convex.
5. Protection: Protect finished joints from contamination or damage until sealant has cured.
Ω End of Section

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Z31
Powder coatings
To be read with preliminaries/ general conditions.
120 Powder coating materials
1. Manufacturer: Obtain from one only of the following: Contractors choice but applied coatings must
achieve a fire classification of A2-s1, d0 to BS EN 13501-1.
2. Selected manufacturer: Submit details before commencement of powder coating including:
2.1. Name and contact details.
2.2. Details of accreditation schemes.
2.3. Technical data of product including current Agrément certificates.
210 Working procedures

1. Comply with the follow following standards.
1.1. Aluminium components: To BS 6496 or BS EN 12206-1.
1.2. Steel components: To BS EN 13438.
1.3. Safety standards: To British Coatings Federation 'Code of safe practice: Powder coating.
Application of coating powders by electrostatic spraying'.
1.4. Health and safety guidance: Health and Safety Executive 'Reducing risk associated with
using coating powders - employers' web page.
220 Powder coating applicators

1. Applicator requirements
1.1. Approved by powder coating manufacturer.
1.2. Currently certified to BS EN ISO 9001.
1.3. Comply with quality procedures, guarantee conditions, standards and tests required by
powder coating manufacturer.
1.4. Selected applicator: Submit details before commencement of powder coating including:
1.4.1.Name and contact details.
1.4.2.Details of accreditation schemes.
225 Guarantees
1. Powder coating manufacturer and applicator guarantees
1.1. Submit sample copies before commencement of powder coating.
1.2. Submit signed project specific copies on completion of work.
230 Control samples

1. Sequence: Prior to ordering materials for the works, obtain approval of appearance for:
1.1. Powder coated samples: Of various grades and forms of background metal to be used,
showing any colour, texture and gloss variation.
1.2. Fabrication samples: Showing joint assembly, how powder coating is affected and how any
cut metal edges are finished and protected.
1.3. Where manual application is required, controlled samples should be coated and inspected
for colour and gloss stability.
2. Samples to include the following information
2.1. Product reference.
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2.2. Colour.
2.3. Reference number.
2.4. Name.
2.5. Gloss level.
235 Independent inspection at plant

1. Requirement: Contractors/ suppliers of the following designated components must commission an
approved Independent Inspection Authority to carry out acceptance inspections to confirm that
powder coating application complies with this specification.
1.1. Designated components: All proposed coated aluminium cladding panels
2. Acceptance inspections: Carry out for each variation of colour and finish of each component work
package at applicator's plant prior to any fabrication of units, in accordance with the following:
2.1. Where three of more production runs are required for application of coatings, not less than
three acceptance inspections must be carried out in accordance with BS 6001-1, general
inspection level 2, with an acceptance quality limit of 1%.
2.2. Where less than three production runs are required for application of coatings, one
acceptance inspection must be carried out in accordance with BS 6001-2, with a limiting
quality of 5% where the probability of acceptance is 10%.
3. Components failing inspection: Reprocess or replace and reinspect.
4. Inspection reports: Independent Inspection Authority must submit copies.
240 Qualicoat quality assurance system

1. Requirement: Powder and coating application to the following designated components is to be
tested and approved in accordance with the Qualicoat system.
1.1. Designated components: All proposed coated aluminium cladding panels
250 Component design

1. Condition of components to be powder coated
1.1. To comply with relevant recommendations of BS 4479-1, -3, and -4.
1.2. Of suitable size to fit plant capacity.
1.3. Of suitable thickness to withstand oven curing.
310 Pretreatment of aluminium components

1. Condition of components to be pretreated
1.1. Free from corrosion and damage.
1.2. All welding and jointing completed and finish off as specified.
1.3. Free from impurities including soil, grease and oil.
1.4. Suitable for and compatible with the pretreatment process.
2. Conversion coating requirements
2.1. Chromate system: To BS 6496 or BS EN 12206-1.
2.2. Chromate-free system: To BS EN 12206-1. Submit details before using.
3. Rinsing requirements: Use demineralized water. Drain and dry.
330 Pretreatment for protection in aggressive environments

1. Minimum thickness of 60 microns across significant and/ or primary surfaces.
2. Minimum thickness of 25 microns on non-significant and/ or secondary faces ensuring a coherent
film layer.
3. All cut edges, drilled holes and mitres to be fully sealed.
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4. Cleaning and maintenance: Carried out once every three to twelve months (dependent on
proximity to pollutant).
430 Extent of powder coatings

1. Application: To visible component surfaces, and concealed surfaces requiring protection. Coated
surfaces will be deemed 'significant surfaces' for relevant BS 6496 or BS EN 13438 performance
requirements.
435 Application of powder coatings

1. Surfaces to receive powder coatings: Free from dust or powder deposits.
2. Powder colours: Obtain from one batch of one manufacturer.
3. Commencement of powder coating: To be continuous from pretreatment.
4. Components to be installed on site in order of application.
5. Jig points: Not visible on coated components.
6. Curing: Controlled to attain metal temperatures and hold periods recommended by powder
coating manufacturer.
7. Stripping and recoating of components: Only acceptable by prior agreement of powder coating
manufacturer. Stripping, pretreatment and powder coating are to be in accordance with
manufacturer's requirements.
8. Overcoating of components: Not acceptable.
440 Performance and appearance of powder coatings

1. For aluminium components
1.1. Standard: To BS 6496 or BS EN 12206-1.
2. For steel components
2.1. Standard: To BS EN 13438.
3. Visual inspection after powder coating: Significant surface viewing distances to be as specified in
the relevant Standard, unless specified otherwise.
4. Colour and gloss levels: To conform with approved samples.
450 Aluminium alloy fabrications

1. Units may be assembled
1.1. Before powder coating.
1.2. From components powder coated after cutting to size.
1.3. Where approved, from components powder coated before cutting to size.
2. Exposure of uncoated background metal: Not acceptable.
3. Assembly sealants: Compatible with powder coatings. Obtain approval of colour if sealants are
visible after fabrication.
470 Fixings
1. Exposed metal fixings: Powder coat together with components, or coat with matching repair paint
system applied in accordance with the powder coating manufacturer’s recommendations.
480 Damaged components – repair or replacement

1. Before delivery to site: Check all components for damage to powder coatings. Replace damaged
components.
2. Site damage: Submit proposals for repair or replacement.

Ltd Powder coatings
14-03-2021 Page 43 of 44
510 Protection
1. Powder coated surfaces of components: Protect from damage during handling and installation, or
by subsequent site operations.
2. Protective coverings must be
2.1. Resistant to weather conditions.
2.2. Partially removable to suit building in and access to fixing points.
3. Protective tapes in contact with powder coatings must be
3.1. Low tack, self adhesive and light in colour.
3.2. Applied and removed in accordance with tape and powder coating manufacturers'
recommendations. Do not use solvents to remove residues as these are detrimental to the
coating.
4. Inspection of protection: Carry out monthly. Promptly repair any deterioration or deficiency.
520 Protection in hazardous locations

1. Minimum thickness of 60 microns across significant and/ or primary surfaces.
2. Minimum thickness of 25 microns on non-significant and/ or secondary faces ensuring a coherent
film layer.
3. All cut edges, drilled holes and mitres to be fully sealed.
4. Cleaning: Carried out once every three to twelve months (dependent on proximity to pollutant).
535 Documentation
1. Submit the following information for each batch of powder coated components
1.1. Supplier.
1.2. Trade name.
1.3. Colour.
1.4. Type of powder.
1.5. Method of application.
1.6. Batch and reference number.
1.7. Statutory requirements.
1.8. Test certificates.
1.9. Maintenance instructions.
540 Completion
1. Protection: Remove any protective coverings.
2. Cleaning and maintenance of powder coatings: Carry out in accordance with procedures detailed
in powder coating manufacturer and applicator guarantees.
Ω End of Section

Ltd Powder coatings
14-03-2021 Page 44 of 44
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FPB: 1001

M D Bithrey Chartered Surveyors Ltd

Highbury Square Management Company Ltd

M D Bithrey Chartered Surveyors H92

130 Major nonstandard components

130 A Major nonstandard components

130 B Major nonstandard components

130 C Major nonstandard components

M D Bithrey Chartered Surveyors H92

5. Material: 2-3mm Aluminium as clause 712.

General requirements/preparatory work

215 Design proposals

230 Information to be provided during detailed design

232 Quality plan

235 Information to be provided before commencement of rainscreen cladding

M D Bithrey Chartered Surveyors H92

240 Product samples

250 Samples of fixings

350 Deflection under wind load

360 Wind resistance – cyclic loading

370 Appearance and fit

M D Bithrey Chartered Surveyors H92

390 Air permeability generally

410 Air permeability

420 Water penetration

450 Air and Vapour control layer

470 Fire performance of rainscreen cladding

485 Internal reaction to fire of backing wall

M D Bithrey Chartered Surveyors H92

490 Fire resistance of cavity fire barriers

510 Comparison (type) testing

595 Air permeability test - Air barrier

712 Aluminium alloy sheet

715 Carbon steel framing sections/ Reinforcement

M D Bithrey Chartered Surveyors H92

717 Carbon steel sheet

720 Stainless steel sheet

730 Mechanical fixings – material requirements

735 Fixings and fasteners

770 General sealants

1.1. Hot dip galvanized to BS EN ISO 1461.

820 Protective coating of carbon steel mechanical fixings

830 Powder coating

Fabrication and installation

922 Fixings/ Adhesives application

925 Sealant application

960 Preliminary rainscreen cladding installation

970 Rainscreen cladding installation

M D Bithrey Chartered Surveyors H92

345 A Perimeter trims

355 Mechanical fasteners, washers, pressure plates, etc.

400 A Waterproof membrane

M D Bithrey Chartered Surveyors J42

520 Incomplete work

530 Applying primers

550 Control samples

620 Renewing existing coverings

625 Removing existing coverings