indicated. Fasteners shall not be over-torqued and shall develop full
capacity of attachment clips.
2.3.2.1
Screws
Provide not less than 0.242 mm No. 14 diameter for self-tapping type and
not less than 0.216 mm No. 12 diameter for self-drilling and self-tapping.
2.3.2.2
Bolts
Provide not less than 6 mm 1/4 inch diameter, shouldered or plain shank as
required, with proper nuts.
2.3.2.3
Automatic End-Welded Studs
Provide shouldered type with a shank diameter of not less than 5 mm 3/16
inch and cap or nut for holding covering against the shoulder.
2.3.2.4
Explosive Driven Fasteners
Provide fasteners to be driven with explosive actuated tools and with a
shank diameter of not less than 13 mm 1/2 inch for fastening to steel and
not less than 25 mm one inch for fastening to concrete.
2.3.2.5
Rivets
Blind rivets shall be aluminum with 5 mm 3/16 inch nominal diameter shank
or stainless steel with 3 mm 1/8 inch nominal diameter shank. Rivets shall
be threaded stem type if used for other than fastening trim. Rivets with
hollow stems shall have closed ends.
2.3.3
Sealant
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.
2.3.4
Sealant Tape
Polyvinyl chloride closed cell foam tape or composed of 99 percent solids
in a base of butyl polyisobutylene rubber with the following properties and
characteristics:
a.
Webbing and Elongation:
100% minimum at 25 degrees C 77 degrees F
b.
Adhesion:
Excellent to surfaces used
c.
U-V light exposure:
No effect
d.
Ozone: No effect
e.
Weathering: 1000 hours in QUV Test Apparatus - Excellent, no
cracking, bleeding, or significant changes.
f.
Moisture Transmission: 0.05 to 0.15 grams per 62500 square mm 100
square inches in 24 hours.
SECTION 07612N
Page 17
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