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 ROOFING / WATERPROOFING STANDARDS (page 1 of 3)
Building Codes
- IBC (International Building Code) 2003
- IPC (International Plumbing Code) 2003
- ASCE 7 (American Society of Civil Engineers) Minimum Design Loads for Buildings and Other Structures
Directives, Standards, and NPS Guidelines
- National Roofing Contractors Association – Roofing and Waterproofing Manual
- Factory Mutual Global
- Underwriters Laboratories
- Wind load as calculated using ASCE 7
- Determination of fire rated roof Classification
- Roof drainage as calculated using IPC or other established sources
- Determine dew point location in roof assembly and vapor barrier needs
Professional Guidance
Single–Ply Membrane Roofs
- Specify roofing products, all manufactured in the United States, supplied by a single manufacturer which has been successfully producing the specified types of primary products with the same materials without making adjustments, modifications or alterations to the chemical or physical composition of the products for not less than the warranty period.
- Specify a 20 year system and require a 15-year System Roofing Manufacturer’s Warranty for labor and material, without monetary limitation, to correct defects in materials or workmanship. Warranty shall contain no exclusions for random occurrences of ponding water.
- Specify PVC (60 mil minimum thickness) and EIP (45 mil minimum thickness) systems to be mechanically attached. Roof membrane is visible from ground shall be fully adhered.
- EPDM systems shall be fully adhered 60 mil thickness, using 7” wide tape seams, and be warranted for 20 years.
- TPO membranes shall not be specified.
- Specify single-ply roof system when foot traffic is minimal,
roof shape is complex or when numerous roof penetrations
are present.
- Specify a dense, fire and water resistance cover board made from gypsum or other man made materials to be placed
over the deck or insulation board. Use adhesive to attach cover board to insulation.
- Specify a pre-manufactured 2-piece counterflashing;
coping system; roof edge/fascia system; and mechanical equipment curbs.
- Minimum roof pitch of ¼”/ft and 1/8”/ft along valleys
SBS Modified Bitumen Roofs
- Specify 2-ply system where roofing products, including each type of sheet, are all manufactured in the United States, supplied by a single manufacturer which has been successfully producing the specified types of primary products with the same materials without making adjustments, modifications or alterations to the chemical or physical composition of the products for not less than the specified warranty period.
- Specify a 20 year system and require a 15-year System Roofing Manufacturer’s Warranty for labor and material, without monetary limitation, to correct defects in materials or workmanship. Warranty shall contain no exclusions for random occurrences of ponding water.
- APA systems are not permitted
- Specify SBS roof systems where high puncture resistance, exposure to abuse or frequent access is needed on the roof to maintain mechanical equipment.
- Specify torch down and adhesive systems, avoid hot
mop asphalt.
- Specify a dense, fire and water resistance cover board made from gypsum or other man made materials to be placed over
the deck or insulation board. Use adhesive to attach cover board to insulation.
- Specify cant strips and curbs to be pressure treated wood unless metal curbs are used. Fiber products are not permitted.
- Specify a pre-manufactured 2-piece counterflashing;
coping system; roof edge/fascia system; and mechanical equipment curbs.
- Minimum roof pitch of ¼”/ft and 1/8”/ft along valleys
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