Home Roofing and False ceiling Galvanized Iron Corrugated Sheet New Stainless Steel Sheet Metal Galvanized Iron As A Fence Corrugated Galvanised Roofing Sheets 意味 Specification Sizes
Brief description from Galvanized Iron Corrugated Sheet above :
Stone lintels have been used to support roofs since prehistoric times, but cannot bridge large distances. The stone arch came into extensive use in the ancient Roman period and in variant forms could be used to span spaces up to 140 feet (43 m) across. The stone arch or vault, with or without ribs, dominated the roof structures of major architectural works for about 2,000 years, only giving way to iron beams with the Industrial Revolution and the designing of such buildings as Paxton's Crystal Palace, completed 1851.
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