Term: Flashing

Flashing refers to thin continuous pieces of sheet metal or impervious material installed to prevent the passage of water into a structure from an angle or joint. Flashing generally operates on the principle that, for water to penetrate a joint, it must work itself upward against the force of gravity, or, in the case of wind-driven rain, it would have to follow a tortuous path during which the driving force would be dissipated…Flashing may be exposed or concealed.”

Source: Building Construction Illustrated, p. 7.18, 4th Edition, Francis D.K. Ching

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