shall be the manufacturer's standard products. Exposed metal accessories
shall be finished to match the panels furnished. [Molded closure strips
shall be bituminous-saturated fiber, closed-cell or solid-cell synthetic
rubber or neoprene, or polyvinyl chloride premolded to match configuration
of the panels and shall not absorb or retain water.] [Die cast metal
closures shall be installed with double bead tape sealant and fasteners
that stitch the panel to a 2 mm 16 gage preformed backer plate to ensure a
positive compression of the tape sealant.] The use of a continuous angle
butted to the panel ends to form a closure will not be allowed.
2.4
FASTENERS
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NOTE: Fasteners that are not color coated may be
limited to 400-series corrosion resisting steel when
justified by atmospheric exposure conditions.
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Fasteners for steel roof panels shall be zinc-coated steel, aluminum,
corrosion resisting steel, or nylon capped steel, type and size specified
below or as otherwise approved for the applicable requirements. Fasteners
for aluminum roof panels shall be aluminum or corrosion resisting steel.
Fasteners for structural connections shall provide both tensile and shear
ultimate strengths of not less than 3340 N 750 pounds per fastener.
Fasteners for accessories shall be the manufacturer's standard. Exposed
roof fasteners shall be sealed or have sealed washers on the exterior side
of the roof to waterproof the fastener penetration. Washer material shall
be compatible with the roofing; have a minimum diameter of 10 mm 3/8 inch
for structural connections; and gasketed portion of fasteners or washers
shall be neoprene or other equally durable elastomeric material
approximately 3 mm 1/8 inch thick. Exposed fasteners for factory color
finished panels shall be factory finished to match the color of the panels.
2.4.1
Screws
Screws for attaching anchor devices shall be not less than No. 14. Actual
screw pull out test results shall be performed for the actual material gage
and yield strength of the structural purlins or subpurlins to which the
clip is to be anchored/attached. Other screws shall be as recommended by
the manufacturer to meet the strength design requirements of the panels.
2.4.2
Bolts
Bolts shall be not less than 6 mm 1/4 inch diameter, shouldered or plain
shank as required, with locking washers and nuts.
2.4.3
Structural Blind Fasteners
Blind screw-type expandable fasteners shall be not less than 6 mm 1/4 inch
diameter. Blind (pop) rivets shall be not less than 7 mm 9/32 inch minimum
diameter.
2.5
SUBPURLINS
Cold formed supporting structural members/subpurlins shall have a minimum
thickness of 1.5 mm 0.059 inches and a minimum tensile yield strength of
345 MPa 50000 psi. Hot rolled structural members shall have a minimum
thickness of 6 mm 0.25 inches and a minimum tensile yield strength of 248
MPa 36000 psi. Subpurlins shall be [galvanized] [shop painted].
SECTION 07416A
Page 17
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