2.6
FASTENERS
Flush-driven through flat round or hexagonal steel or plastic plates. Steel
plates shall be zinc-coated, flat round not less than 35 mm 1 3/8 inch
diameter or hexagonal not less than 0.4 mm 28 gage. Plastic plates shall
be high-density, molded thermoplastic with smooth top surface, reinforcing
ribs and not less than 75 mm 3 inches in diameter. Fastener head shall
recess fully into the plastic plate after it is driven. Plates shall be
formed to prevent dishing. Do not use bell-or cup-shaped plates. Fasteners
shall conform to insulation manufacturer's recommendations except that
holding power, when driven, shall be not less than [178 N 40 pounds] [534 N
120 pounds] each in steel deck. Fasteners for steel or concrete decks
shall conform to FM P7825c for Class I roof deck construction, and shall be
spaced to withstand an uplift pressure of [2.87] [4.3] [_____] kPa [60]
[90] [_____] pounds per square foot.
2.6.1
Roofing Nails for Wood Decks
Barbed 3 mm 11 gage, zinc-coated nails with 11 to 16 mm 7/16 to 5/8 inch
diameter heads or annular ring shank, square head, one-piece composite
nails. Nails shall be long enough to penetrate wood deck at least 16 mm
5/8 inch but shall not protrude through underside of decking.
2.6.2
Fasteners for Plywood Decks
Annular ring shank, square head, one-piece composite nails long enough to
penetrate into plywood decks approximately 13 mm 1/2 inch but not protrude
through underside of decking.
2.6.3
Fasteners for Steel Decks
Approved hardened penetrating fasteners or screws conforming to FM AS 4470
and listed in FM P7825c for Class I roof deck construction. Quantity and
placement to withstand a minimum uplift pressure of [2.87] [4.31] [_____]
kPa [60] [90] [_____] psf conforming to FM P7825.
2.6.4
Fasteners for Poured Concrete Decks
Approved hardened fasteners or screws to penetrate deck at least 25 mm one
inch but not more than 38 mm 1 1/2 inches, conforming to FM AS 4470, and
listed in FM P7825 for Class I roof deck construction. Quantity and
placement to withstand an uplift pressure of [2.87] [4.31] [_____] kPa [60]
[90] [_____] psf conforming to FM P7825.
2.7
WOOD NAILERS
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NOTE: When roof slope exceeds one in 24 1/2 inch
per foot, insulating materials beneath built-up
roofing should be both mopped and held in place by
treated wood nailers. Non-nailable decks should be
provided with surface-applied nailing strips of same
thickness as insulation. See built-up bituminous
roofing specifications for requirements on nailing
of roofing felts. For all insulated roof decks,
treated wood nailers should be applied at eave
edgings and sides of roofs and around curbs and
elsewhere as necessary to provide nailing for gravel
stops and flashings. Refer to FM Loss Prevention
SECTION 07220
Page 17
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