Insulation shall be installed between covering and supporting members to
present a neat appearance. Fold and staple [and tape] seams unless
approved otherwise by the Contracting Officer.
]3.3.2.1
Rigid or Semi-Rigid Insulation
Install in areas where insulation is exposed to view.
Fasten securely
without loose joints or unsightly sags.
3.3.2.2
Blanket Insulation
May be used in concealed locations. Lap facing at joints and fasten in a
manner that will provide tight joints.
3.3.3
Flashings
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NOTE: In high winds, metal will vibrate and fatigue
at fasteners on "normal" spacings. For this reason,
cleated (blind fastened) flashings are not
acceptable, and attachment at 150 to 200 mm 6 to 8
inches on center is customary. Flashing should not
extend any significant distance more than one inch
beyond a support or fastener.
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Provide flashing, related closures and accessories as indicated and as
necessary to provide a weathertight installation. Install flashing to
ensure positive water drainage away from roof penetrations. Flash and seal
the roof at the ridge, eaves and rakes, and projections through the roof.
Place closure strips, flashing, and sealing material in an approved manner
that will assure complete weathertightness. Details of installation which
are not indicated shall be in accordance with the SMACNA Arch. Manual,
panel manufacturer's approved printed instructions and details, or the
approved shop drawings. Allow for expansion and contraction of flashing.
3.3.4
Flashing Fasteners
Fastener spacings shall be in accordance with the panel manufacturer's
recommendations and as necessary to withstand the design loads indicated.
Install fasteners in roof valleys as recommended by the manufacturer of the
panels. Install fasteners in straight lines within a tolerance of 13 mm
1/2 inch in the length of a bay. Drive exposed penetrating type fasteners
normal to the surface and to a uniform depth to seat gasketed washers
properly and drive so as not to damage factory applied coating. Exercise
extreme care in drilling pilot holes for fastenings to keep drills
perpendicular and centered. Do not drill through sealant tape. After
drilling, remove metal filings and burrs from holes prior to installing
fasteners and washers. Torque used in applying fasteners shall not exceed
that recommended by the manufacturer. Remove panels deformed or otherwise
damaged by over-torqued fastenings, and provide new panels.
3.3.5
Rib and Ridge Closure/Closure Strips
Set closure/closure strips in joint sealant material and apply sealant to
mating surfaces prior to adding panel.
SECTION 07611N
Page 22
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