sheet in the run shall extend over three or more supports. Sheets longer
than 30 m 100 feet may be furnished if approved by the Contracting Officer.
Width of sheets shall provide not more than 600 mm 24 inches of coverage
in place. SSSMR system with roofing panels greater than 300 mm 12 inches
in width shall have standing seams rolled during installation by an
electrically driven seaming machine. Height of standing seams shall be not
less than [_____] mm inches for rolled seam and [_____] mm inches for seams
that are not rolled.
2.1.1
Steel Panels
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NOTE: When a factory color finish is specified,
remove last two sentences from this paragraph. AZ
50 coating is allowed for factory-color-finish and
not for mill finish. Remove this paragraph when
steel panels are not used in the project.
**************************************************************************
Steel panels shall be zinc-coated steel conforming to ASTM A 653/A 653M;
aluminum-zinc alloy coated steel conforming to ASTM A 792/A 792M, AZ [55]
[50] coating; or aluminum-coated steel conforming to ASTM A 463/A 463M,
Type 2, coating designation T2 65. Zinc, zinc-aluminum alloy or aluminum
coated panels shall be 0.584 mm 0.023 inch thick minimum. Panels shall be
within 95 percent of reported tested thickness as noted in wind uplift
resistance testing required in paragraph PERFORMANCE REQUIREMENTS. Prior
to shipment, mill finish panels shall be treated with a passivating
chemical to inhibit the formation of oxide corrosion products. Panels that
have become wet during shipment and have started to oxidize shall be
rejected.
2.1.2
Aluminum Panels
**************************************************************************
NOTE: Remove this paragraph when aluminum panels
are not used in the project.
**************************************************************************
Alloy conforming to ASTM B 209M ASTM B 209, temper as required for the
forming operation, minimum 0.8 mm 0.032 inch thick.
2.2
CONCEALED ANCHOR CLIPS
Concealed anchor clips shall be the same as the tested roofing system.
Clip bases shall have factory punched or drilled holes for attachment.
Clips shall be made from multiple pieces with the allowance for the total
thermal movement required to take place within the clip. Single piece
clips may be acceptable when the manufacturer can substantiate that the
system can accommodate the thermal cyclic movement under sustained live or
snow loads.
2.3
ACCESSORIES
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NOTE: Select either die cast metal closures or
molded closure strips as appropriate.
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Flashing, trim, metal closure strips, caps and similar metal accessories
SECTION 07416A
Page 16