Furnace exhausting is freezing up

01-18-2009, 07:57 PM	#1
garbageman1 Newbie   Join Date: Jan 2009 Posts: 2	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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01-18-2009, 10:50 PM	#2
Dr Heat Member     Join Date: Jan 2009 Location: Northern Central IL Posts: 94	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?

01-20-2009, 03:39 PM	#3
garbageman1 Newbie   Join Date: Jan 2009 Posts: 2	Furnace exhausting is freezing up It ices up on the exterior of the house. Eventually water (ice melt) or condensate is leaking BR ceiling.

01-20-2009, 11:14 PM	#4
Dr Heat Member     Join Date: Jan 2009 Location: Northern Central IL Posts: 94	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.