Furnace Roof Exhaust Pipe Leaking

There are many possible parts of the roof potentially leaking but one of the most common ones is the area around the roof vent.

Furnace roof exhaust pipe leaking.

Roof leaks around vent pipes is relatively common. If your furnace exhaust pipe or flue pipe is leaking it can be a sign of a much bigger problem. Cut away the old caulk from around the vent pipe. Steps for fixing a leaking rooftop vent pipe.

The pipe leading to the main roof vent is called the vent stack. The plumbing vent pipe is a vertical pipe that attaches to the drain line and runs through the roof of a home. Vent pipes penetrate all the way through the roof in several locations of the house and each one needs to be maintained to keep water out. To be more specific the pipe that comes out of the unit is attached to this leaking section which is attached to a pvc elbow then another piece of pipe.

Apply a thick bead of lap seal caulk around the seam between the vent pipe and old rubber gasket. Use the knife blade to scrape the pipe clean and smooth. A standard efficiency furnace extracts some heat from the combustion gases and quickly vents them out the exhaust or flue pipe. The roof vent pipe is installed cut through the roof and around the pipe attached to the roof is surrounded with rubber boot as insulation for the gap between the pipe and roof.

If you have a condensation leak with a standard efficiency then its exhaust or flue pipe may be incorrectly sized. Today i noticed water leaking from a section of the pvc exhaust pipe which travels upward from the furnace across the ceiling and out of basement wall where it vents into my backyard. The leaking may first be seen in the attic but if you don t catch it right away you may see water coming into the house dripping on the floor. It helps maintain proper atmospheric pressure in a building s waste system and channels the exhaust gasses to the vent.

Vent pipe leaks during heavy rain can occur if you have cracks in your vent pipe boot or flashing. There should be no water involved with a standard efficiency furnace.