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Learn About Roof Flashing

Flashing helps direct the flow of water around openings. Learn how to correctly install flashing when constructing a new house or altering the exterior of a house.

Excerpted from Do It Yourself Home Improvement

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Slide Flashing Over Pipe Vent and Under Shingle
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Pipe Vent Flashing

When you are roofing around a pipe vent (also called a pipe stack), you will need to cut out the shape of the pipe from the row of shingles. Fit the shingle row around the bottom part of the pipe. Then, slide pipe flashing over the pipe so that it extends 4 inches (100 mm) below the pipe, 8 inches (200 mm) above the pipe, and 6 inches (150 mm) to the right and left. The bottom part of the flashing will overlap the shingle row, as shown.



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