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Flashing (weatherproofing)
Flashing refers to thin pieces of impervious material installed to prevent the passage of water into a structure from a joint or as part of a ''weather resistant barrier'' (WRB) system.
==Definition and etymology==
The origin of ''flash'' and ''flashing'' are uncertain but these words are related to a ''pool of water'' and the word ''splash''.〔Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009. Flash, n.4, flash, v.1, flashing,〕 Usage may come from Middle English between 1350–1400 "...flasshen to sprinkle, splash (with ) ''flask''...".〔http://dictionary.reference.com/browse/flashing referenced 04/12/2013〕 Dictionary quotes refer to lead as the material used as a flash. Counter-flashing (cover flashing, cap flashing) is when there are two parallel pieces of flashing used together〔http://encyclopedia2.thefreedictionary.com/counterflashing accessed 04/12/2013〕 such as on a chimney where ''counter-flashing'' is built into a chimney and overlaps a replaceable piece of ''base flashing''. Strips of lead used for flashing an edge were sometimes called an ''apron'',〔Loudon, J. C.. An encyclopædia of cottage, farm, and villa architecture and furniture; containing numerous designs for dwelling ... each design accompanied by analytical and critical remarks .... London: Longman, Rees, Orme, Brown, Green, & Longman, 1833. 126. Print.〕 the term is still used for the piece of flashing below a chimney. The up-hill side of a chimney may have a small gable-like assembly called a cricket with ''cricket flashing'' or on narrow chimneys with no cricket a ''back flashing'' or ''back pan flashing''. Flashing may be let into a groove in a wall or chimney called a ''reglet''.
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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