PREFAB DC/PREFAB SUB-STATION ROOF H

INSPECTION CHECKLIST Te
For Galaxy NICTIB II Kano State Data Center
BACKGROUND PROCESS
Roof systems can deteriorate from: normal wear; severe Regional maintenance personnel are to:
weather conditions (e.g., wind and snow loads); building
movement (e.g., settlement, material contraction/ • Perform annual formal visual roof inspections when
expansion); and improper design, construction and roofs are free of snow and materials, and informal
maintenance. Any roof repairs not dealt with after the first inspections after every severe wind or rain condition.
signs of failure can result in increased damage to the • Review, learn and follow roof safety procedures,
building envelope and interior finishes, and loss of occupant including those in the Fall Prevention and Roof Safety
productivity, if damage causes interruption in client services pamphlet; learn about problem roof conditions and
and program delivery. Failure of structural integrity can terminologies.
endanger occupant safety.
• Before performing a roof inspection, review: past
inspection reports and photographs; construction
PURPOSE documents; particulars of any repair/maintenance/
replacement, and the most current Roof Snow Overload
Regular inspection of building roof systems will lead to Risk Assessment checklist.
early detection of roof problems, protection of Government
• Include non-destructive investigation (e.g., infrared
capital assets, and maintenance of safe working thermography) if moisture infiltration is suspected.
environments for building occupants.
• Obtain approval of PW&S Regional Superintendent
prior to any demolition detection work on any wall,
OBJECTIVES ceiling, or roof cavity.
• Include photographs and test data in the report, so that
• To determine if the roof system is performing according changes in roof condition can be verified, and so that a
to its intended function.
historic record of roof condition is available to future
• To identify signs of weakness, deterioration or hazard. inspectors.
• To identify needed repairs. • Keep and maintain records of all: inspections
(including this checklist); test investigations
(thermographic readings); and roofing repairs and
GENERAL APPROACH replacements.
• Develop a maintenance workplan to correct deficient
• Inspect exterior for: continuity of roof covering; conditions in a timely manner.
deterioration of fascias, gutters and soffits; and
performance of flashings. • Monitor the snow loading on roofs. When the snow
loading on High Risk Roofs exceeds the usual winter
• Inspect interior finishes (ceilings and walls) for signs of
water penetration, frost buildup and structural distress. accumulation, steps are to be taken to remove the
excess snow. Inform the PW&S Regional
• Record and report inspection findings. Superintendent when usual winter snow accumulations
• Initiate maintenance and repair projects. are exceeded on High Risk Roofs. Removal of snow
must be done in such a manner as to ensure the safety of
• Report any unsafe working conditions or potential maintenance personnel and minimize damage to the
system failures immediately to the PW&S Regional roof structure and membrane.
Superintendent.

PUBLIC WORKS AND SERVICES

 ROOF INSPECTIONS

INSPECTION CHECKLIST
General Roof Conditions
Item Remarks
Ceiling Conditions
Item Remarks
Debris on Roof
Cracks
Drainage
Physical Damage
Water Staining OCCUPANT
Water Leaks
Attic Conditions
Seasonal Change RESPONSIBILITIE
Structural Deformation
Other
Other S
Flat / Membrane Roof
Item Remarks
Condition of Coating
Granular Loss
Punctures
Exterior Wall Surfaces
Item Remarks
Cracks / Alligatoring
Deformed Finish
Blisters / Fishmouths
Surface Deterioration
Ponding
Staining
Other
Other
Sloped Roof
Item Remarks
Roof Material
Interior Wall Surfaces
Item Remarks
Condition of Surface
Cracks
Deformed Edges
Water Staining
Shingle: Buckled
Water Leaks
Curled
Deformed Finish
Missing Tabs
Seasonal Change
Granular Loss
Window Leaks
Other
Door/Window Alignment
Metal: Corrosion
Other
Fasteners
Other
Roof Features Summary/Comments
Item Remarks
(Highlight areas of concern and any
Fascia
rapid degradation in roof system)
Soffit
Flashing
Gutters / Drains, etc.
Skylights
Chimneys / Vents
Fall Arrest Anchors
Control Zone Access
Drains / Vents
Other

• Immediately report signs of envelope movement, and degradation,

especially after extreme weather conditions.
• Immediately report signs of roof damage, structural anomalies and/or
leaks to PW&S Regional maintenance personnel.
• Coordinate impacts on facility program activities, once PW&S regional
maintenance staff informs occupants about planned roof inspection,
maintenance and repair programs.

ROOF INSPECTIONS
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 ROOF INSPECTIONS

Comment on changes from previous inspections, and overall roof condition. Indicate recommended action of roof repair and/or further
assessment, and estimated remaining life expectancy of roof system. Include any photographs and thermography records in this report.

ROOF PLAN AND DETAILS

USE THIS AREA ONLY IF DEFICIENCIES ARE OBSERVED.

Sketch roof plan. Include north arrow, the location of the items listed below, approximate dimensions of building, roofing materials, and
other relevant items located on the roof. Show changes in roof elevations in a separate sketch.

Identification Code
A – Access Hatch E – Expansion Joint Cover R – Roof Vent V – Vent Pipe
B – Base Flashing F – Fascia and Gravel Stop U – HVAC Unit L – Ladder
C – Cap Flashing G – Gutter System J – Flag Pole S – Skylight
D – Roof Drain H – Vent / Fan Hood W – Ponded Water T – Walkway
K – Chimney P – Parapet or Fire Wall

PWS RESPONSIBILITIES
• Develop and implement a maintenance program, including using the Roof Inspection Checklist.
• Perform annual visual roof inspections for all GNWT operated facilities, and complete a report based on the checklist.
• Interview occupants concerning building performance.
• Recommend actions to repair unsatisfactory conditions, including developing a maintenance workplan based on the urgency of required upgrades.
• Maintain a history of roof inspection reports for each GNWT owned/operated facility at the Regional PW&S office in order to monitor changes in
roof system performance.
• Report rapidly deteriorating roofs and/or water damage to the PW&S Regional Superintendent.
• The PWS Regional Superintendent is to notify the PW&S Deputy Minister of significant roof deterioration when the risk of a major failure
becomes apparent.
• Inform Technical Support Services of significant roof degradation for their review related to failed building system performance and consideration
of changes to building design standards.

ROOF INSPECTIONS
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 ROOF INSPECTIONS

GLOSSARY OF ROOFING TERMS USED IN THIS CHECKLIST

Alligatoring Shrinkage cracking of the bituminous surface of built- Fascia The finish member covering the edge or eaves of a flat or sloping roof or
up or smooth surface roofing, producing a pattern of roof overhang.
deep cracks resembling an alligator hide.
Fishmouth An opening of the lapped edge of applied felt in built-up roofing due to
Asphalt A highly viscous hydrocarbon produced from the adhesion failure.
residuum left after the distillation of petroleum; used
as a waterproofing agent of a built-up roof. Flashing Connecting devices that seal membrane joints, drains, gravel stops and
other places where membrane is interrupted. Base flashing forms the
Ballast An anchoring material (such as rock, gravel, pavers) upturned edges of the watertight membrane. Cap or counter flashing
used to resist wind uplift forces of roof membrane. shields the exposed edges and joints of the base flashing.

Bitumen A generic term for asphalt or coal tar pitch roofing. Gravel Stop Flanged device, normally metallic, designed to prevent loose aggregate
from washing off roof. It also provides a finished edge detail for built-up
Blister A spongy raised portion of roofing membrane as a roofing assembly.
result of pressure of entrapped air or water vapour.
High Risk A roof which scores 15 or greater out of 20 using the Snow Overload
Built-up A continuous, semi-flexible roof covering consisting Roof Risk Assessment checklist.
Roofing of laminations or plies of saturated or coated felts
(BUR) alternated with layers of bitumen. Modified Asphalt with the addition of polymer modifiers to increase cold
Bitumen temperature flexibility and warm temperature flow resistance and
Cant Strip A continuous strip of triangular cross-section, fitted stability.
into the angle formed by a structural deck and a wall
or other vertical surface, and used to provide gradual PVC A generic term for single ply plastic sheet membrane (poly vinyl
transition for base flashing and horizontal roof chloride); seams are fused by solvent or hot-air welding techniques.
membrane.
Parapet The part of the wall entirely above the roof.
Crack A break in a roofing membrane as a result of flexing,
often occurring at a ridge or wrinkle. Ponding The collection of water in shallow pools on the roof surface.

EPDM A synthetic rubber sheet used in single ply roof Slope The ratio between the measures of the rise and the horizontal span.
membrane (ethylene propylene diene monomer).
Soffit The finish on the underside of a roof overhang.
Expansion A deliberate separation of two roof areas to allow
Joint expansion and contraction movements of the parts.

Eaves The protective overhang at the lower edge of a sloped

roof.

Facility Name: TCA#:

Community:

Type of Roof: Flat / Membrane:

Sloped: Slope: in 12

Construction / Re-roofing / Repair Dates:

Roof Snow Overload Risk Assessment out of 20

Checklist (copy attached)

Inspected by: Date:

For further information, please contact

Preventive roof maintenance Technical Support Services
Asset Management Division
Proper roof maintenance will: Public Works and Services
Box 1320, Yellowknife, NT, X1A 2L9
• increase the life expectancy of your roof
• save you the high cost of roof replacement Tel: (867) 920-8088
Fax: (867) 873-0226
• protect your assets from costly damage http://www.pws.gov.nt.ca/