How to repair a cracked drain vent collar

Written by philip schmidt
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Rubber vent collars, or boots, are easy to install and do a good job of sealing around vent pipes to keep rain and melted snow from penetrating the roof. But as with most materials, exposure to weather and UV light eventually leads to cracks in the rubber and, ultimately, a failed seal. Fixing an aged and cracked collar with gobs of roofing cement might stop the leaks for awhile, but there’s a better solution: installing a new rubber repair collar over the top of the old one. It’s a no-mess fix that you can perform in a rainstorm, if necessary.

Skill level:

Things you need

  • Rag
  • Vent pipe repair collar

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  1. 1

    Measure the diameter of the vent pipe, and purchase a rubber repair collar rated for your size of vent. Vent collars are designed to seal around pipes without caulk, so a proper fit is critical. Some collars are adjustable and can fit a limited range of pipe sizes.

  2. 2

    Clean off any dirt or debris from the outside of the vent pipe, using a rag.

  3. 3

    Fit the collar over the vent pipe so the convex side is pointing up. Slide the collar down the pipe until it is firmly seated over the original collar.

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