2.1.1
Material
Zinc-coated steel conforming to ASTM A 653/A 653M, Z275 G90coating
designation or aluminum-zinc alloy coated steel conforming to ASTM A 792/A
792M, AZ 165 AZ 55 coating. Minimum thickness to be 0.6 mm 0.023 inch
thick (24 gage) minimum except when mid field of roof is subject to design
wind uplift pressures of 3 kPa 60 psf or greater, entire roof system shall
have a minimum thickness of 0.8 mm 0.030 inch (22 gage). [Prior to
shipment, treat mill finish panels with a passivating chemical and oil to
inhibit the formation of oxide corrosion products. Dry, retreat, and
re-oil panels that have become wet during shipment or storage but have not
started to oxidize.]
2.1.2
Texture
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NOTE: Stucco embossing is a mechanical process that
imparts some structural strength to the steel and
reduces the visual effect of oil-canning. Embossed
texture is slightly more expensive than smooth
texture but should be considered for use on high
visibility projects.
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[Stucco embossed.]
[Smooth.]
[Smooth with raised intermediate ribs for
added stiffness.]
2.1.3
Finish
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NOTE: Choose finish appropriate for the project.
In general, hangars, warehouses, and other
utilitarian structures may use unpainted finish to
reduce cost. ASTM A 792/A 792M (Galvalume) should
be specified only for corrosive environments when
unpainted finish is required. Delete paragraph
"Laboratory Tests for Panel Finish" and reference to
finishes when unpainted finish is specified. Some
paint colors are substantially more costly than
others, due to scarcity of pigments.
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[Unpainted] [Factory color finish].
[2.1.3.1
Factory Color Finish
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NOTE: Provide clear edge coating on all metal
panels for projects within the salt spray area of
the ocean (within 300 feet of the water).
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NOTE: Check with the facility regarding color
selection. Use only manufacturer's standard colors.
Delete this subparagraph if unpainted finish has
been selected. Specify 0.050 mm 0.2 mil prime coat
if undersides of panels are to be field painted, the
SECTION 07611N
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