wood blocking details (i.e., expansion joints, area
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
FASTENERS AND PLATES
Coated, corrosion-resistant fasteners as recommended by the modified
bitumen sheet manufacturer's printed instructions and meeting the
requirements of FM AS 4470 and FM P7825c for Class I roof deck construction
and the wind uplift resistance specified. For fastening of membrane or
felts to wood materials, provide fasteners driven through 25 mm (1 inch)
diameter 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.
2.9.1
Masonry or Concrete Walls and Vertical Surfaces
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, modified bitumen sheets, metal items, and accessories to masonry or
concrete walls and vertical surfaces. Use power-driven fasteners only when
approved in writing by the Contracting Officer.
2.9.2
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.
Discs shall be formed to prevent dishing or cupping.
[2.10
PRE-MANUFACTURED ACCESSORIES
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NOTE: Edit, delete, and insert accessory materials
requirements as required for the specific project
and components to be installed.
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Pre-manufactured accessories shall be manufacturer's standard for intended
purpose,[ comply with applicable specification section,] compatible with
the membrane roof system and approved for use by the modified bitumen
membrane manufacturer.
[2.10.1
Vapor Pressure Relief Vents
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NOTE: Venting of roof insulation may be advisable
SECTION 07550
Page 20
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