dividers, and wall/roof intersections where roof
deck is not supported by a wall).
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Standard cant strips shall be of perlite conforming to ASTM C 728 [or
woodfiber conforming to ASTM C 208] treated with bituminous impregnation,
sizing, or waxing and fabricated to provide maximum 45 degree change in
direction of membrane. Cant strips shall be minimum 38 mm (1-1/2 inches)
thick and provide for minimum 125 mm (5 inch) face and 89 mm (3-1/2 inch)
vertical height when installed at 45 degree face angle, except where
clearance restricts height to lesser dimension. Kiln-dried
preservative-treated wood cants, in compliance with requirements of Section
06100 ROUGH CARPENTRY, shall be provided at base of wood nailers set on
edge and wood curbing and where otherwise indicated.
2.9
UNSATURATED FELT OR ROSIN-SIZED BUILDING PAPER
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NOTE: Include requirement for unsaturated felt or
rosin-sized building paper under base sheet on wood
decks substrates to prevent bitumen drippage through
deck joints.
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Minimum weight, 5 pounds per 100 square feet.
2.10
FASTENERS AND PLATES
Coated, corrosion resistant fasteners compatible with components being
attached and contact surfaces. Fasteners for attachment to deck substrate
shall conform to FM AS 4470 for Class I roof deck construction and FM P7825c
for the wind resistance specified. Use hard copper fasteners in contact
with copper; aluminum or stainless steel fasteners in contact with
aluminum; and stainless steel fasteners in contact with stainless steel.
For fastening only roofing felts, use fasteners driven through metal discs,
or one-piece composite fasteners with heads not less than 25 mm (1 inch) in
diameter or 25 mm (1 inch) square with rounded or 45-degree tapered corners.
[2.10.1
Wood Substrates and Nailers
Provide 11 gage annular threaded shank nails with 7/16 to 5/8 inch diameter
heads; or one-piece composite nails with annular threaded shanks not less
than 11 gage for securing felts and metal items. Fasteners shall be long
enough to penetrate minimum 25 mm (1 inch) into or minimum 6mm (1/4 inch)
through wood substrate materials. Fasteners shall not penetrate wood
decking exposed to view on the underside.
][2.10.2
Masonry or Concrete Walls and Vertical Surfaces
Provide hardened steel nails or screws with flat heads, diamond shaped
points, and mechanically deformed shanks not less than 25 mm (1 inch) long
for securing felts, metal items, and accessories. Use power-driven
fasteners only when approved in writing by Contracting Officer.
]2.10.3
Metal Plates
Flat corrosion-resistant round stress plates as recommended by the modified
bitumen sheet manufacturer's printed instructions and meeting the
requirements of FM AS 4470; not less than 50 mm (2 inches) in diameter.
SECTION 07511
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