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Drywall (also known as plasterboard, wallboard, gypsum board) is a panel made of gypsum plaster pressed between two thick sheets of paper. It is used to make interior walls and ceilings.〔http://www.merriam-webster.com/dictionary/plasterboard〕 Drywall construction became prevalent as a speedier alternative to traditional lath and plaster. In many places, the product is sold under the trademarks Sheetrock,〔Trademark of USG Corporation〕 Gyproc.〔Trademark of Compagnie de Saint-Gobain〕〔("Why can't I put my leftover gyproc/drywall in the garbage?" ), RECYCLING COUNCIL OF BRITISH COLUMBIA〕〔(''"...the name of the relevant company's product is commonly used to designate the product itself ("gyproc" in Belgium..."'' ), website of the European Union〕 In the United Kingdom, Australia and New Zealand the category is known as plasterboard and proprietary brands include Gib®.〔A registered trademark of Winstone Wallboards〕〔("Making Gib® board by hand, 1927" ), Te Ara〕〔("A plasterboard called Gib® board became the most common material..." ), Te Ara〕 ==History== The first plasterboard plant in the UK was opened in 1888 in Rochester, Kent. Sackett Board was invented in 1894 by Augustine Sackett and Fred Kane. It was made by layering plaster within four plies of wool felt paper. Sheets were 36" × 36" × 1/4" thick with open (untaped) edges.〔http://www.gypsum.org/mediaguide.html Gypsum Association History of Gypsum Board〕 Gypsum Board evolved between 1910 and 1930 beginning with wrapped board edges, and elimination of the two inner layers of felt paper in favor of paper-based facings. In 1910 United States Gypsum Corporation bought Sackett Plaster Board Company and by 1917 came out with a product they called ''Sheetrock''.〔Powell, Jane, and Linda Svendsen. ''Bungalow details: interior''. Salt Lake City: Gibbs Smith, 2006. Print. 53-54.〕 Providing efficiency of installation, it was developed additionally as a measure of fire resistance. Later air entrainment technology made boards lighter and less brittle, then joint treatment materials and systems also evolved.〔 Rock Lath (gypsum lath) was an early substrate for plaster. An alternative to traditional wood or metal lath, it was a panel made up of compressed gypsum plaster board that was sometimes grooved or punched with holes to allow wet plaster to key into its surface. As it evolved, it was faced with paper impregnated with gypsum crystals that bonded with the applied facing layer of plaster. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Drywall」の詳細全文を読む スポンサード リンク
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