Make Roof Penetrations Watertight
Learn how to make penetrations in a roof membrane, such as pipes or vent stacks, watertight in this step-by-step process.
A vent stack or other pipe penetration is a common spot for a roof leak. The process for detailing a pipe penetration with a low-slope roof relies on redundant seals and compatible products. Here’s how to make a pipe penetration watertight on a EPDM membrane roof.
Commercial roofing systems have tested methods for sealing common roof penetrations like pipes, ducts, chimneys, and skylights. In addition to multiple skylights—including a 6-ft. round one—this roof had plumbing and mechanical penetrations and an 8-ft.-wide masonry chimney with leaky flashing. Methods vary for dealing with penetrations, but a skilled roofer should be able to solve most problems with tested assemblies. Detail drawings are often available from the roofing manufacturer.
- Critical Roof Flashings Keep Water Out
- Time-Tested Approach to Chimney Flashing
- Vent Flashing Done Right