Furnace exhaust pipe running through insulation?

Old 01-26-12, 08:24 AM
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Furnace exhaust pipe running through insulation?

We bought a house on foreclosure that thas a natural gas water heater and furnace. The exhaust piping for both is PVC. Both are in the basement and the basement was dug after the house was built, so the walls for the basement are two feet inside the foundation. There is about a two foot space between the walls and foundation. I would like to insulate the area behind the basement walls and around the exhaust piping. Can I put fiberglass insulation with paper backing right up against the exhaust or will this be a fire hazard?

Old 01-26-12, 08:50 AM
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I believe the PVC is also considered combustible material.
Old 01-26-12, 05:01 PM
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No fire hazzard that I know of but it's always a good idea to maintain at least a 1" clearance around the vent pipe.

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