Valley flashings - cutting the points

Roofing · Asphalt Shingles · printed page 10 (PDF page 11)

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Cutting the Points – on Asphalt Shingles

Text in the illustration

water flow
clipping the shingle corners (cutting the points) is a good practice as it discourages water that is flowing down the valley from running along the top of the shingle tab

Generated explanation

The illustration shows two asphalt-shingled roof slopes meeting at an open, flashed valley, with a magnified detail of the shingle edges. The detail depicts clipping the upper corners of shingles where they border the valley flashing. Blue arrows show water flowing down the valley, while a prohibition symbol marks lateral flow along the top of a shingle tab. Cutting these points discourages valley runoff from being diverted beneath the shingles.

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