adjusted properly to install particular type and size of screw as
recommended by manufacturer's literature. Improper or mislocated drill
holes shall be plugged with an oversize screw fastener and gasketed washer;
however, sheets with an excess of such holes or with such holes in critical
locations shall not be used. Exposed surfaces and edges shall be kept
clean and free from sealant, metal cuttings, hazardous burrs, and other
foreign material. Stained, discolored, or damaged sheets shall be removed
from the site.
3.1.1
Field Forming of Panels for Unique Area
When roofing panels are formed from factory-color-finished steel coils at
the project site, the same care and quality control measures that are taken
in shop forming of roofing panels shall be observed. Rollformer shall be
operated by the metal roofing manufacturer's representative. In cold
weather conditions, preheating of the steel coils to be field formed shall
be performed as necessary just prior to the rolling operations.
3.1.2
Subpurlins
Unless otherwise shown, subpurlins shall be anchored to the purlins or
other structural framing members with bolts or screws. Attachment to the
substrate (when provided) or to the panels is not permitted. The subpurlin
spacing shall not exceed 750 mm 30 inches on centers at the corner, edge
and ridge zones, and 1500 mm 5 foot maximum on centers for the remainder of
the roof. Corner, edge, and ridge zones are as defined in ASCE 7.
3.1.3
Roof Panel Installation
Roof panels shall be installed with the standing seams in the direction of
the roof slope. The side seam connections for installed panels shall be
completed at the end of each day's work. Method of applying joint sealant
shall conform to the manufacturer's recommendation to achieve a complete
weather-tight installation. End laps of panels shall be provided in
accordance with the manufacturer's instructions. Closures, flashings, EPDM
rubber boots, roof curbs, and related accessories shall be installed
according to the manufacturer's drawings. Fasteners shall not puncture
roofing sheets except as provided for in the manufacturer's instructions
for erection and installation. Expansion joints for the standing seam roof
system shall be installed at locations indicated on the contract drawings
and other locations indicated on the manufacturer's drawings.
3.1.4
Concealed Anchor Clips
Concealed anchor clips shall be fastened directly to the structural framing
members. Attachment to the substrate (when provided) or to the metal deck
is not permitted. The maximum distance, parallel to the seams, between
clips shall be 750 mm 30 inches on center at the corner, edge, and ridge
zones, and 1500 mm 5 feet maximum on centers for the remainder of the roof.
3.2
INSULATION INSTALLATION
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NOTE: Choose one paragraph and delete the other.
Use rigid or semirigid board insulation with a roof
deck. Use blanket insulation without a roof deck.
A maximum of 100 mm (4 inches) of batt insulation
may be compressed at purlins. Thermal blocks should
be shown where required for thermal efficiency.
SECTION 07416A
Page 26
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