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rainscreen
A rainscreen is an exterior wall detail where the siding (wall cladding) stands off from the moisture-resistant surface of an air barrier applied to the sheathing (sheeting) to create a capillary break and to allow drainage and evaporation. The ''rain screen'' is the siding itself〔(Micheal J. Lough and David Altenhofen, "The Rain Screen Principle" )〕 but the term rainscreen implies a system of building. Ideally the rain screen prevents the wall air/moisture barrier on sheathing from getting wet. In some cases a rainscreen wall is called a ''pressure-equalized rainscreen'' wall where the ventilation openings are large enough for the air pressure to nearly equalize on both sides of the rain screen,〔Brown, W. C, Rousseau, M. Z., and Dalgliesh, W. A., "Field Testing of Pressure-Equalized Rain Screen Walls," Donaldson, Barry, ed.. ''Exterior wall systems: glass and concrete technology, design, and construction''. Philadelphia, PA: ASTM, 1991. 59. Print.〕 but this name has been criticized as being redundant〔Rousseau, M.Z., "Facts and Fictions of Rain-Screen Walls", ''Construction Canada'', 1990.〕 and is only useful to scientists and engineers.
==Definitions==
A ''screen'' in general terms is a barrier.〔"Screen" def. 2. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009〕 The rainscreen in a wall is sometimes defined as the first layer of material on the wall, the siding itself.〔 Also, rainscreen is defined as the entire system of the siding, ''drainage plane'' and a ''moisture/air barrier''.〔(''Pressure Equalization in Rainscreen Wall Systems'', National Research Council of Canada ). Retrieved 2013-12-01〕〔(''The Rainscreen Principle in Design'', National Research Council of Canada ). Retrieved 2013-12-01〕 A veneer that does not stand off from the wall sheathing to create a cavity is not a rainscreen. However, a masonry veneer can be a rainscreen wall if it is ventilated.
Many terms have been applied to rain screen walls including basic, open, conventional, pressure-equalized, pressure-moderated rainscreen systems or assemblies. These terms have caused confusion as to what a rain screen is but all reflect the ''rainscreen principle'' of a primary and secondary line of defense. One technical difference is between a plane, a gap of or less and a channel, a gap of more than .
In general terms a rainscreen wall may be called a ''cavity'' or ''drained wall''.〔("Building Envelope Design Guide - Wall Systems" in ''Whole Building Design Guide'' )〕 The two other basic types of exterior walls in terms of water resistance are ''barrier walls'' which rely on the one exterior surface to prevent ingress and ''mass walls'' which allow but absorb some leakage.〔
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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