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Standing seam metal roof. A metal roof is a roofing system featuring metal pieces or tiles exhibiting corrosion resistance, impermeability to water, and long life. It is a component of the building envelope. The metal pieces may be a covering on a structural, non-waterproof roof, or they could be self-supporting sheets.
Corrugated galvanised iron (CGI) or steel, colloquially corrugated iron (near universal), wriggly tin (taken from UK military slang), pailing (in Caribbean English), corrugated sheet metal (in North America), zinc (in Cyprus and Nigeria) or custom orb / corro sheet (Australia), is a building material composed of sheets of hot-dip galvanised ...
A study by Ducker International in 2005 identified the average cost per year of a metal roof to be US$3.2 per square metre ($0.30/sq ft) while single-ply roofs stood at $6.1/m 2 ($0.57/sq ft) and built-up roofing at $4.0/m 2 ($0.37/sq ft).
Cold-rolled carbon structural steel sheet A611 A 25 42 1.68 26 B 30 45 1.50 24 C 33 48 1.45 22 D 40 52 1.30 20 Zinc-coated or zinc-iron alloy-coated steel sheet A653 SS Gr. 33 33 45 1.36 20 Gr. 37 37 52 1.41 18 Gr. 40 40 55 1.38 16 50 Class 1 50 65 1.30 12 50 Class 3 50 70 1.40 12 HSLAS Type A 50 50 60 1.20 20 60 60 70 1.17 16 70 70 80 1.14 12 80
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Manufacturers' Standard Gauge for Sheet Steel is based on an average density of 41.82 lb per square foot per inch thick, [11] equivalent to 501.84 pounds per cubic foot (8,038.7 kg/m 3). The older United States Standard Gauge is based upon 40 lb per square foot per inch thick.
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