New Roof Details:
Installing Shingles Around A Roof Penetration
A Vent Flange Provides A Flexible And Water-Tight Seal Between The Roof And A Plumbing Vent Pipe
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In This Article:
Shingles are cut to fit around the plastic vent flange that fits over a plumbing vent pipe. |
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Skill Level:
2-3 (Basic + )
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Time Taken:
About 10 Minutes
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Author:
Bruce W. Maki, Editor
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Project Date:
October 2000
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When the rows of shingles reached the plumbing vent penetration, the vent flange (red arrow) was set in place.
The shingles were cut with a pair of tin snips. (This shingle was laid over top just for purposes of measuring.)
The first row of cut shingles was nailed in place. The flange goes over top of these shingles.
The next row of shingles were cut to fit around the dome of the flange.
I set the notched shingle in place to test the fit over the vent flange.
This row of shingles goes over top of the flange.
In essence, the flange acts like a shingle itself... it lays on top of the shingles below it, and underneath the shingles above.
We applied a bead of roofing tar near the edge of the U-shaped cut in this shingle.
We also applied a bead of tar between the cut edge and the dome of the vent flange.
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We installed another row of shingles above the vent flange.
Some roofers prefer to apply shingles over the black plastic space below the dome. My belief is that putting shingles there only slows down the flow of water and might contribute to a leak someday. I'd sooner leave the area below the dome free and clear so water can exit quickly.
The completed vent flange in a roof full of shingles.
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Tools Used:
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Materials Used:
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