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The pitch of a roof is its vertical 'rise' over its horizontal 'run’ (i.e. its span), also known as its 'slope'. In the imperial measurement systems, "pitch" is usually expressed with the rise first and run second (in the US, run is held to number 12; [1] e.g., 3:12, 4:12, 5:12). In metric systems either the angle in degrees or rise per unit ...
Replacing the roofing felt on a Scout hall in Wales. Bituminous waterproofing systems are designed to protect residential and commercial buildings.Bitumen (asphalt or coal-tar pitch) is a material made up of organic liquids that are highly sticky, viscous, and waterproof. [1]
Bonnet roof: A reversed gambrel or Mansard roof with the lower portion at a lower pitch than the upper portion. Monitor roof: A roof with a monitor; 'a raised structure running part or all of the way along the ridge of a double-pitched roof, with its own roof running parallel with the main roof.' Butterfly roof (V-roof, [8] London roof [9]): A ...
TPO roofing systems feature strong seams that are heat-welded, providing superior seam strength and reducing the risk of leaks compared to other roofing systems with adhesive or tape seams. A TPO roof system can be fully adhered, mechanically fastened, or ballasted, although TPO roof systems are rarely ballasted, since the ballast covers up the ...
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In Scandinavia shakes, traditionally used only for roofing, are generally smaller than in North America, measuring 13–16 inches (330–410 mm) long, 4–6 inches (100–150 mm) wide and 1 ⁄ 8 inch (3.2 mm) thick, [6] while in Poland and Slovakia they are usually 36 inches (910 mm) long, 4–6 inches (100–150 mm) wide and 1–1.25 inches ...
Natural bitumen from the Dead Sea Refined bitumen The University of Queensland pitch drop experiment, demonstrating the viscosity of bitumen. Bitumen (UK: / ˈ b ɪ tʃ ʊ m ɪ n / BIH-chuum-in, US: / b ɪ ˈ tj uː m ɪ n, b aɪ-/ bih-TEW-min, by-) [1] is an immensely viscous constituent of petroleum.