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Steep roof materials are roofs that are only recommended where water can freely and openly drain off the edge of the roof without retaining water for too long. [1] The aim is to drain off water completely due to the high water permeability of most of these materials, for instance: the Thatched roofs.
In 1940, the U.S. Justice Department filed suit against USG and six other wallboard manufacturers, charging them with price fixing under §§ 1 and 2 of the Sherman Act. The claim stemmed from US Gypsum's 1929 cross-licensing agreements for its patented wallboard, which set prices at which the wallboard must be sold.
Perforated hardboard. Perforated hardboard, also called pegboard, is tempered hardboard that has a uniform array of 1 ⁄ 8-or-1 ⁄ 4-inch (3.2 or 6.4 mm) holes in it, into which tool-hanging hooks or store fixtures can be placed.
Various sized cuts of 1 ⁄ 2 in (13 mm) drywall with tools for maintenance and installation . Drywall (also called plasterboard, dry lining, [1] wallboard, sheet rock, gib board, gypsum board, buster board, turtles board, slap board, custard board, gypsum panel and gyprock) is a panel made of calcium sulfate dihydrate (), with or without additives, typically extruded between thick sheets of ...
GRC (Glass fibre-reinforced concrete) ceramic consists of high-strength, alkali-resistant glass fibre embedded in a concrete & ceramic matrix. [1] In this form, both fibres and matrix retain their physical and chemical identities, while offering a synergistic combination of properties that cannot be achieved with either of the components acting alone.
Perforated wood is more labor-intensive to manufacture and will warp and splinter under heavy loads, but is sometimes selected for aesthetic reasons. An inexpensive wood such as pine is often used, and it may be chemically treated for strength and fire retardant characteristics or turned into plywood first.
A gypsum block is made of gypsum plaster and water. The manufacturing process [1] is automated at production plants where raw gypsum (CaSO 4 ·2H 2 O) is ground and dried, then heated to remove three-quarters of the bound water and thus transformed into calcium sulfate hemihydrate (CaSO 4 ·½H 2 O), also known as gypsum plaster, stucco, calcined gypsum or plaster of Paris.
In August 2005, BPB received a hostile takeover bid from Saint-Gobain, which set a price of 720 pence per share. The BPB initially resisted this strongly, but eventually accepted a revised bid of 775 pence per share, which valued the company at £3.9billion (US$6.7 billion). [4] BPB was delisted in December 2005.