Furnace Roof Exhaust Pipe Leaking

There should be no water involved with a standard efficiency furnace.

Furnace roof exhaust pipe leaking. 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. Vent pipe leaks during heavy rain can occur if you have cracks in your vent pipe boot or flashing. It helps maintain proper atmospheric pressure in a building s waste system and channels the exhaust gasses to the vent. Roof leaks around vent pipes is relatively common.

There are many possible parts of the roof potentially leaking but one of the most common ones is the area around the roof vent. Cut away the old caulk from around the vent pipe. A roof that leaks around a vent pipe is a common cause of small water stains on a ceiling or water leaking into a home. 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.

Here s what to look for. The pipe leading to the main roof vent is called the vent stack. If your furnace exhaust pipe or flue pipe is leaking it can be a sign of a much bigger problem. 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.

The plumbing vent pipe is a vertical pipe that attaches to the drain line and runs through the roof of a home. If you have a condensation leak with a standard efficiency then its exhaust or flue pipe may be incorrectly sized. Use the knife blade to scrape the pipe clean and smooth. 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.

A standard efficiency furnace extracts some heat from the combustion gases and quickly vents them out the exhaust or flue pipe. Apply a thick bead of lap seal caulk around the seam between the vent pipe and old rubber gasket.