Furnace Vent Roof Leak

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Furnace vent roof leak. But some roof air vents sit fairly flat to the roof with a mushroom style hood and unprotected sides. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. When the vent is withdrawing air from the house it expels the gas outside through the vent. Roof leaks around vent pipes is relatively common.

Here s what to look for. Steps for fixing a leaking rooftop vent 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. There are many possible parts of the roof potentially leaking but one of the most common ones is the area around the roof vent.

Use the knife blade to scrape the pipe clean and smooth. If your roof vent leaks during heavy rain the rain may be blowing up under the hood and into the vent. 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. Another problem is that flue pipes that go through the roof tend to be less efficient.

I had a small leak from the vent pipe in the last rain so used some pl roof flashing sealant to fix it. Also known as the type b this vent is operating on the natural air convection. Use a pocketknife to scrape rough edges and sharp points from upper end of plastic vent pipe. If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof.

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. This old house general contractor tom silva shows how to create a watertight seal around a vent pipe. 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.