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flashing
A method of sealing joints on buildings, especially around roofs, chimneys,
gutters, and valleys, in order to render them water-tight. It consists of
using strips, or shingles, of flashing material which are worked into the
normal roof surface and turned over the joint. Where the flashing turns
up, as along a brick wall, it is necessary to counter-flash, that is to
let a strip of flashing material into the brickwork and bend it down over
the other flashing. A sloped shingle roof flashed against a brick wall requires
flashing shingles which are worked under the top course of the regular shingles
and turned up along the bricks. Corresponding counter-flashing let into
the brick is bent down over these flashing shingles. A joint between the
gutter and cornice is made weather-proof by flashing. Usually the flashing
extends from under the lowermost course of shingles and is turned down over
the edge of the gutter. The most common flashing materials are tin-coated
sheet iron and copper. Lead and zinc are used to a limited extent.
Related category
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BUILDING AND ARCHITECTURE
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