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Building material
Building material is any material which is used for construction purposes. Many naturally occurring substances, such as clay, rocks, sand, and wood, even twigs and leaves, have been used to construct buildings. Apart from naturally occurring materials, many man-made products are in use, some more and some less synthetic. The manufacture of building materials is an established industry in many countries and the use of these materials is typically segmented into specific specialty trades, such as carpentry, insulation, plumbing, and roofing work. They provide the make-up of s and structures including homes.〔"building" def. 2 and 4, "material" def. 1. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0)© Oxford University Press 2009〕
==The total cost of building materials==
In history there are trends in building materials from being: natural to becoming more man-made and composite; biodegradable to imperishable; indigenous (local) to being transported globally; repairable to disposable; and chosen for increased levels of fire-safety. These trends tend to increase the ''initial'' and ''long term'' economic, ecological, energy, and social costs of building materials.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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