slope]. Individual panels shall be of continuous length sufficient to
cover the entire length of any unbroken roof slope with no joints or seams,
except where indicated or approved otherwise by the Contracting Officer.
Panels shall be formed without warping, waviness, or ripples that are not a
part of the panel profile and shall be free of damage to the finish coating
system. Provisions shall be made for thermal expansion and contraction
consistent with the type of system to be used. All sheets shall be either
square-cut or miter-cut.
2.1.1
Steel Panels
**************************************************************************
NOTE: Delete this paragraph when steel panels are
not used in the project.
When a factory color finish is specified, remove
last two sentences from this paragraph.
AZ 50 coating is allowed for factory-color-finished
and not for mill finish.
Consider aluminum-coated steel materials for Army
projects only.
**************************************************************************
Zinc-coated steel conforming to ASTM A 653/A 653M, Structural Grade 40 and
minimum G90 galvanized smooth metallic coating; 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]. Prepainted steel sheet shall also comply with ASTM A
755/A 755M. Roof panel material shall be minimum [0.60 mm (24 gage)][0.76
mm (22 gage)] thick prior to coating application, and as required to meet
wind uplift requirements. Panels shall be within 95 percent of the nominal
thickness. Prior to shipment, mill finish panels shall be treated with a
passivating chemical and oiled 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: Delete this paragraph when aluminum panels
are not used in the project.
**************************************************************************
Alloy 3003 or 3004 conforming to ASTM B 209 ASTM B 209M, temper as required
for the forming operation; minimum [0.80 mm (0.032 inch)][1.0 mm (0.040
inch)] thick, and as required to meet wind uplift requirements.
2.1.3
Texture
[Smooth][Stucco embossed][Smooth with raised intermediate stiffening
ribs][as shown on drawings].
2.2
ROOF PANEL FACTORY COLOR FINISH
**************************************************************************
NOTE: Factory color finish shall be specified
except when the buildings are to be used for
temporary purposes or where mill finish aluminum or
SECTION 07412
Page 15
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