2.4.1.2
Ridge Closures
Metal-clad foam or metal closure with foam secondary closure matching panel
configuration for installation on surface of roof panel between panel ribs
at ridge and headwall roof panel flashing conditions and terminations.
Foam material shall not absorb water.
2.4.2
Fasteners
Zinc-coated steel, corrosion resisting steel, zinc cast head, or nylon
capped steel, type and size specified below or as otherwise approved for
the applicable requirements. Design the fastening system to withstand the
design loads specified. Exposed fasteners shall be gasketed or have
gasketed washers on the exterior side of the covering to waterproof the
penetration. Washer material shall be compatible with the covering; 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.
2.4.2.1
Screws
Not smaller than 4.75 mm No. 14 diameter if self-tapping type and not
smaller than 4 mm No. 12 diameter if self-drilling and self-tapping.
2.4.2.2
Bolts
Not smaller than 6 mm 1/4 inch diameter, shouldered or plain shank as
required, with proper nuts.
2.4.2.3
Automatic End-Welded Studs
Automatic end-welded studs shall be shouldered type with a shank diameter
of not smaller than 5 mm 3/16 inch and cap or nut for holding covering
against the shoulder.
2.4.2.4
Explosive Driven Fasteners
Fasteners for use with explosive actuated tools shall have a shank diameter
of not smaller than 4 mm 0.145 inch with a shank length of not smaller than
13 mm 1/2 inch for fastening to steel and not smaller than 25 mm one inch
for fastening to concrete.
2.4.2.5
Rivets
Blind rivets shall be stainless steel with 3 mm 1/8 inch nominal diameter
shank. Rivets shall be threaded stem type if used for other than the
fastening of trim. Rivets with hollow stems shall have closed ends.
2.4.3
Sealants
Elastomeric type containing no oil or asphalt. Exposed sealant shall cure
to a rubberlike consistency. Concealed sealant shall be the non-hardening
type. Seam sealant shall be factory-applied, non-skinning, non-drying, and
shall conform to the roofing manufacturer's recommendations.
Silicone-based sealants shall not be used in contact with finished metal
panels and components unless approved otherwise by the Contracting Officer.
SECTION 07611N
Page 19
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