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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 ...
Cinder block or concrete block; Noxer block; Stone dry stacked or mortar set; Urbanite – broken-up concrete; Category:Masonry. Category:Bricks; also: "Concrete Masonry Units" (CMU) Category:Stone (material) Metals. Structural steel: I-beam and column; Rebar; Wire rope and cables; Metal joist, decking, framing, trusses; Metal fabrications
Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure.
In a typical 8-inch wall panel the concrete wythes are each 2-3/8 inches thick), sandwiching 3-1/4 inches of high R-value insulating foam. The interior and exterior wythes of concrete are held together (through the insulation) with some form of connecting system that is able to provide the needed structural integrity.
Cast iron was not useful for items in tension like beams, where the more expensive wrought iron was preferred. Improvements in production saw the costs decrease at the same time as cast iron gained popularity. The puddling process, patented in 1784, was a relatively low cost method for producing a structural grade wrought iron.
Patrick said his state put boots on the ground to investigate the sale: "Texas sent a representative to Arizona, and the auctioneers told him they pulled the wall panels from being auctioned off ...
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