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How to Fix a Leaky Gas Flue Roof Vent – Part 4

This repair is continued from Part 3. The HVAC contractor began the work by disconnecting the old vent pipe at the first joint below the roof deck in the attic. To disconnect the pipe, just slide the retaining collar up and wiggle/lift the pipe to separate. The shiny new pipe sections are shown in this [...]

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How to Fix a Leaky Gas Flue Roof Vent – Part 3

This project is continued from Part 2. The right vent stack in this photo continues to have a slow leak only when it rains. Resealing the storm collar didn’t fix the leak. I learned after the roofer resealed the vent stacks there was severe rusting under the rain cap that couldn’t be seen from the [...]

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How to Fix a Leaky Gas Flue Roof Vent – Part 2

This repair is continued from Part 1. The attic leak is believed to be caused by a bad seal around the storm collar. The storm collar acts like an umbrella to prevent moisture from entering the joint where the flashing cone meets the vent pipe. Bookmark It!

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How to Fix a Leaky Gas Flue Roof Vent – Part 1

My home is heated by natural gas. Two ‘Type B’ gas flue vents convey the exhaust gases to vents on the roof from the furnace and water heater. I noticed rain water was leaking down the gas flue pipe into the attic. This project explains how to diagnose and fix the leak. The two gas [...]

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