Metal valley flashing - alternate application

Roofing · Valley Flashings · printed page 18 (PDF page 19)

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Book index entries

Alternate Application for Metal Valley Flashings Alternate Applications Valley Flashing On Roofs

Text in the illustration

nails not more than 18" O.C. and located 1" away from edges
metal valley flashing with total width of at least 24"- centered in valley
ice and water shield extending under edge of metal flashing to:
A make nail holes more watertight
B extend width of flashing by 18" on each side
C provide some extra adhesion of the metal flashing to the roof
at least 12" on each side of the valley

Generated explanation

The illustration shows an open metal valley between two intersecting shingle-covered roof slopes. Metal flashing is centered in the valley, with a total width of at least 24 inches and at least 12 inches on each side. Nails are specified at no more than 18 inches on center and 1 inch from the flashing edges. Ice and water shield extends beneath the metal edges to improve nail-hole watertightness, extend flashing coverage by 18 inches on each side, and provide additional adhesion to the roof.

Components

metal valley flashing roof shingles ice and water shield flashing nails roof valley

Materials

sheet metal roofing shingles ice and water shield membrane