Home Roofing and False ceiling Material Plastic Sheets 2440x1220mm 3mm 4mm Polypropylene Corrugated Plastic Sheet Flute Pp Material Data Sheets Properties Hips Reliance Raw Specification Abs Safety Eva Pom
Brief description from Material Plastic Sheets 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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