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Old 02-12-2012, 10:42 AM   #1
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Dumb Question


walked out back of house today, saw an icicle hanging from my pvc furnace vent coming through the sill plate of my house. not big at all, was NOT obstructing the pipe whatsoever. i assume this is common? this something i need to have my furnace guy look at? he does a spring A/C, fall furnace checkup for me and didn't say anything. don't want to bother him if i don't need to.
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Old 02-12-2012, 10:52 AM   #2
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Re: Dumb Question


Its normal. High efficency furnaces condense thats why they use PVC and direct vent them. I hear what your say though, it looks like it can eventually build up and block the whole vent.

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Old 02-12-2012, 11:35 AM   #3
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Re: Dumb Question


I think the pvc pipe should slope back to the furnace to prevent this. Could it be a drip from the roof line that hits the pipe and forms the ice?
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Old 02-12-2012, 11:39 AM   #4
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Re: Dumb Question


Its most likely the sloping away from the furnace that is causing the slow drip to freeze up as it closer to the outdoors.
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Old 02-12-2012, 12:15 PM   #5
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Re: Dumb Question


yep, I had my 90+ heater for about the last 12 years - every year same icicle and I'll just knock it off when it gets to big. Pipe is configured correctly and install was top notch.

No worries though...if it blocks you'll be the first to know when the heater shuts off...least i assume so anyway with the newer equipment
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Old 02-19-2012, 04:02 AM   #6
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Re: Dumb Question


There is supposed to be a pitch in the pipe, but in very cold climates the water doesn't have a chance to drain back to furnace and it starts building icicles. We've had to go to jobsites to clear this ice as sometimes it builds up and it renders the furnace from working properly or at all.

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