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Old 01-18-2009, 06:57 PM   #1
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Furnace exhausting is freezing up


My parents live in a very cold weather area. Every winter ice forms on the exhaust vent from the gas furance. In addition water leaks on the bedroom ceiling. I assume this is from condensation or from the ice. I had them insulate the the exhaust vent in the attic. Didn't work.

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Old 01-18-2009, 09:50 PM   #2
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Furnace exhausting is freezing up


is the ice inside the pipe are the pipes leaking or is the ice forming on the outside of the pipe?

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Old 01-20-2009, 02:39 PM   #3
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Furnace exhausting is freezing up


It ices up on the exterior of the house. Eventually water (ice melt) or condensate is leaking BR ceiling.
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Old 01-20-2009, 10:14 PM   #4
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Furnace exhausting is freezing up


The PVC should totally sealed and pitched toward the furnace; therefore, no leaks should exist.

When a flue is run though an unconditioned space it needs to be insulated so the temp in the flue will stay high enough to vent properly.

I use pre formed rubiflex and tape the seams with mastic tape.
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