Rainscreen Cladding
Rainscreen Cladding
Rainscreen Cladding
CI/SfB (47) N
September 2010
Rainscreen cladding
insulation solutions
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Natura Plus, New North Apartments, London Front cover: Natura Pro, Sir Thomas Wharton College, Doncaster
Marley Eternit
Marley Eternit is committed to the cost effective
and sustainable manufacture of high quality,
high performing cladding systems.
• Natura Pro
• Natura Plus
• Textura
• Pictura
• Operal
• Cedral Weatherboard
• Lamina External
Visit www.marleyeternit.co.uk or
call 01283 722588.
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A+ it's fibre
cemen
t
E te rn n
Marley achiev
ea
g can
claddin lo west
+ ti n g for the
A r a pact in
iro n m ental im to
env Guide
Green
“
B R E
the ation*.
Specific
With the energy saving measures required
in today’s built environment, rear ventilated
cladding systems can bring unique levels of
thermal, acoustic and weather-resisting
performance to old and new buildings
through a range of sectors.
Rainscreen cladding
Marley Eternit fibre cement cladding
systems offer an unparalleled blend
of aesthetic and performance
characteristics for all types of rainscreen
applications across all sectors.
4
5
6
can be accommodated, acoustics
- Healthcare 7
enhanced, thermal bridging minimised
and weather resistance, as well as Rainscreen cladding 8-9
aesthetics improved. principles and benefits
Rainscreen and overcladding 10
The high Green Guide ratings Marley
Eternit claddings achieve will help to Rainscreen and wall insulation 11
comply with the Building Regulations Thermal design details:
and the Code for Sustainable Homes,
- Building Regulations 12
or attain a high BREEAM rating, essential
in both the public and private sectors. - Upgrading existing structures 13
and overcladding
Cladding is a fast-track, sustainable
- New structures – housing 14
solution for both refurbishment and
new build projects. It is also a dry - New structures – commercial, 15
construction process that aligns well education or healthcare
with modern methods of construction, Types of rainscreen cladding 16-17
offering both contemporary and flexible
Fixing systems 18
design options.
Services and support 20
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Location: Sheffield
Application: Commercial
Colour: Opal
Natura Pro, 3 Assembly Square, Cardiff Natura Pro, Hunslett Wharf, Leeds
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Housing
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In schools and universities, thermal performance is of With its UV coating, Natura Pro offers protection against
paramount importance, but so are other issues such as graffiti – making it ideal for educational environments.
those of impact resistance, low maintenance and ‘high
value aesthetics’ which go together to create effective and
efficient learning environments that the students respect
and enjoy. Marley Eternit cladding systems combine all of
these characteristics in a range of easy to install options.
Location: Manchester
Specifier: Britch
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Healthcare
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Rainscreen cladding
principles and benefits
The past
The rainscreen principle is not new, nor is the idea of
rainscreen applied to wall design.
Rainscreen cladding
Today’s rainscreen systems offer unique aesthetic and
performance benefits:
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• Any interstitial condensation kept to outside of structure • Insulation is external, so no thermal breaks required
to accommodate internal structural elements such
• Quickly removed via evaporation
as floors and beams
• Structure maintained at even temperature
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The aesthetic, remedial and thermal solution Embodied energy for cladding materials
One of the key ways in which rainscreen can benefit existing The table below shows embodied energy for various cladding
buildings is through overcladding. materials. Lower embodied energy will allow the designer to
achieve a higher BREEAM rating.
Apartment and office blocks, retail and commercial
establishments etc. may well require both remedial and
aesthetic work to make them suitable for today's environment. Timber
Decorative
• Remedial fibre cement
• Aesthetic Galvanised
steel
• Thermal Polyester coated
aluminium
Maintenance
Natura Plus, Atkinson’s Store, Sheffield
Building life
Whilst overcladding will not reinstate structural integrity of a
building, it will, if designed and installed correctly, extend its
life by improving weather resistance.
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Mineral wool
(rigid slab)
Glass wool
(felt or soft slab)
Glass wool
(rigid slab)
Foamed glass
insulation
Extruded
polystyrene (XPS)
Expanded
polystyrene (EPS)
GJ/m3 0 5 10 15
Cedral Weatherboard, Wansey Street, London
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Marley Eternit products, used in an SAP 2005 can be used to demonstrate that CO2 emissions
from a dwelling plus an extension taken together are no worse
external rainscreen cladding system can than that of the dwelling complying with regulations plus a
accommodate a wide range of insulation separate extension complying with regulations. This process
types and thicknesses to help meet the may involve improvements to the existing thermal elements,
such as walls, roofs and floors, which must comply with
requirements of Part L, both for new build Part L1B standards.
and refurbishment construction.
Part L2A ‘New non-dwellings’
There are 5 key criteria for compliance:
Building Regulations
The relevant documents are Approved Document L1A 1 CO2 emissions must be less than target value.
‘Conservation of fuel and power in new dwellings’; L1B
2 The thermal performance of building fabric
‘Conservation of fuel and power in existing dwellings’; L2A
and services must satisfy minimum standards.
‘Conservation of fuel and power in new buildings other than
dwellings’ and L2B ‘Conservation of fuel and power in existing 3 Summer time solar gains must be controlled.
buildings other than dwellings’ for England and Wales and
4 Pressure testing and ‘Quality of Construction’ will be
Section 6 ‘Energy’ (domestic and non-domestic) for Scotland.
mandatory.
The Building Regulations prescribe high standards of building
5 Building users should be supplied with sufficient information
fabric insulation for floors, walls and roofs as well as space
to operate the building in the most energy efficient manner.
heating, lighting and hot water controls so as to limit the heat
loss from the building. Significant improvements in carbon dioxide emissions are
required when comparing the notional and actual results.
The following sections briefly summarise the content of the
In general terms these represent the improvements to the
four parts of Part L:
levels stated in the 2002 regulations:
Part L1A ‘New dwellings’
Heated and naturally ventilated: 23.5%
The target CO2 Emission Rate for dwellings
up to 450m2 is calculated using SAP (Standard Heated and mechanically ventilated: 28%
Assessment Procedure) 2005 for a ‘notional’ Air conditioned: 28%
dwelling of the same size and shape as the
‘actual’ dwelling (based on set construction rules). Again, two phases of calculation for emissions rate are
required:
The Simplified Building Energy Model (SBEM) will be used for
larger dwellings. 1 Design calculations presented in a report to Building Control
The Dwelling Emissions Rate (DER) must be no higher than 2 Following full building pressure testing, a final calculation to
the target. Two phases of calculation for the DER are required: confirm that the building complies ‘as built’.
1 Design calculations presented in a report to Building Control Part L2B ‘Existing non-dwellings’
that defines the critical design features This applies to extensions and subsequent fit
out works, change of use, material changes,
2 Following dwelling pressure testing, a final calculation to work on controlled services etc. New building
confirm that the building complies ‘as built’ fit outs for existing buildings should comply
Part L1B ‘Existing dwellings’ with new building regulations.
This includes most extensions, material changes of use, Part L 2006 introduces ‘Consequential Improvements’ which
material alterations, provision of controlled fittings may in some situations require the upgrading of windows,
and services and provision or renovation of a boilers, air-conditioning and lighting as well as the inclusion
thermal element. The recommended maximum of energy metering systems.
U-values for an extension may be varied on
condition that it is no worse overall than a similar
extension built to the standards and that the
defined maximum U-values are not exceeded.
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80mm Rockwool
Rainscreen Duo-slab
Brickwork wall 0.35 mineral wool 3
• Ventisol fixing system Fixing system 2
Marley Eternit
cladding 5
2 3 4 5
80mm Rockwool
Rainscreen Duo-slab
mineral wool 5
Air
• Marley Eternit external cladding u-value Brickwork 3 gap 6
• Ventisol fixing system
• Air gap
upgrade
Empty cavity 2
Marley Eternit
cladding 7
2 3 4 5 6 7
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38 x 50mm batten 5
Air gap 7
Blockwork wall
• Marley Eternit external
0.25
u-value
cladding
50 x 50mm counterbatten 4
Marley Eternit
Cladding 8
4 5 2 3 7 6 8
1 2
38 x 50mm
timber batten 7
Marley Eternit
cladding 8
3 4 5 6 7 8
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Thermostop pad 7
120mm insulation 6
Lightweight
steel frame
0.23 Bluclad cement board 5
u-value
• Marley Eternit external 100 x 75mm ‘C’ Sections 4
cladding
• 125mm stone mineral wool
• Ventisol or similar framing system
• Bluclad cement board
• 100 x 75mm ‘C’ sections
90mm insulation 3
• 90mm glass mineral wool
• Vapour control layer
Vapour control layer 2
1 2 3 4 5
6mm gap 9
30mm gap 10
Marley Eternit
Cladding 11
6 7 8 9 10 11
Air gap 5
Concrete wall
construction
0.14 130mm PIR insulation 4
1 2
6mm gap 6
Marley Eternit
cladding 7
Blue/Black
3 4 5 6 7
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• Variegated fibre cement finish • Choice of through-coloured panels • Available in any factory-approved
RAL colour (subject to minimum order)
• Choice of subtly pigmented surfaces • Class 0 fire performance
• Textura panels have an installed life
• Class 0 fire performance • Economical expectancy of at least 50 years
• Economical • Secret fix system • Granular finish
• Secret fix system • Natura Plus panels have an installed life • Fully compressed fibre cement panel
expectancy of at least 50 years
• Natura Pro panels have an installed life • Class 0 fire performance
expectancy of at least 50 years • Easy to fix
• Resistant to impact damage
• Easy to fix • Incorporating ‘Swiss Pearl’ technology
• Secret mechanical fixing system
• Designed for rainscreen cladding • Designed for rainscreen cladding
systems systems • Frost proof
• Excellent weather resistance • Excellent weather resistance • Resistant to weather and atmospheric
pollutants
• Resistant to insects, mould growth • Resistant to insects, mould growth
and fungi and fungi • Excellent fire performance
• No routine maintenance necessary • No routine maintenance necessary • Will not support mould growth or fungi
• Natura Pro panels are suitable for a • Natura Plus panels are suitable for a • No routine maintenance necessary
wide range of high quality facade wide range of high quality facade • Textura cladding panels are suitable for
applications applications a wide range of high quality facade
• BBA certificate No. 06/4355 • BBA certificate No. 06/4355 applications
• BBA Certificate No. 06/4355
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* Cedral Weatherboard based on generic rating for autoclaved fibre cement (calcium silicate) cladding (Element ref: 806220701, 806220675, 806220676)
Fibre Cement Cladding based on generic rating for autoclaved fibre cement single sheet (Element ref: 80623042, 806230422, 806230447, 806230450)
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Fixing systems
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This publication is based on the latest data available at the time of printing. Due to product changes, improvements and other factors, the Company reserves the right to change or withdraw
information contained herein without prior notice. For specific applications users should refer to the Technical Advisory Service and relevant Standards and Codes of Practice for guidance.
The photography shown in the document should not necessarily be taken as recommendations of good practice. The printing process restricts the exact representation of colours. For true colour
reference, please request product samples.
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Stockist information
To find details for stockists of Marley Eternit products:
T 01283 722588 E cladding@marleyeternit.co.uk
Interlocking slates
Decorative cladding
Profiled sheeting
Customer Services
Tel 01283 722588 Fax 01283 722219 E-mail cladding@marleyeternit.co.uk
www.marleyeternit.co.uk