A-A-52313A
3.4. Out-of-square. The ends of the corrugated steel sheets shall not be out-of-square more than 5/16-inch in the full width.
3.5 Covering width. The covering width of each corrugated sheet shall be 24 inches ± 1 inch. The nominal 2-1/2 inch corrugation is 2.66 inches in actual width because nine corrugations measure 24 inches in cover width.
3.6 Type I, roofing sheet. The type I roofing sheet shall be of the following dimensions and shall be corrugated with one longitudinal edge turned up and the other turned down.
3.6.1 Width. The width of the roofing sheet after corrugation shall be 27-1/2 inches with a tolerance of + 1/2 inch or -0 inch.
3.6.2 Length. The roofing shall be of the following lengths:
a. 96 inches – tolerance +3/4-inch, -0 inch
b. 132 inches – tolerance +1-1/4 inch, -0 inch
c. 144 inches – tolerance +1-1/4 inch, -0 inch.
3.7 Type II, siding sheet. The type II siding sheets shall be corrugated with both longitudinal edges turned in the same direction.
3.7.1 Width. The width of the siding sheet after corrugation shall be 26 inches with a tolerance of +1/2 inch or -0 inch.
3.7.2 Length. The siding sheet shall be of the following lengths:
a. 60 inches – tolerance +1/2 inch, -0 inch
b. 108 inches – tolerance +1 inch, -0 inch
c. 144 inches – tolerance +1-1/4 inch, -0 inch
3.8 Thickness. The unpainted sheets shall be of the following nominal thickness:
a. 0.0149-inch (28 gauge)
b. 0.0299-inch (22 gauge).
3.9 Treatment and painting. When specified, the corrugated steel sheets shall be cleaned, treated, and painted in accordance with DoD-P-15328 (pretreatment), MIL-P-53022 (primer), and MIL-DTL-53039 (topcoat). The top coat shall be the color and gloss as specified in the contract or purchase order. Finish shall be identified as:
a. U – unpainted
b. P – painted.
3.10 Salt resistance of coating. The coating applied in treatment and painting shall withstand 300 hours of salt fog treatment in accordance with ASTM B117 without any
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