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#929891 - 01/02/18 06:11 PM Re: Sewer Vents Freezing Over [Re: FredDwyer]
CabinConnection Offline
Bigfoot
Carpal Tunnel

Registered: 01/20/04
Posts: 52860
Loc: The Indianhead's Left Nostril....
Originally Posted By FredDwyer
OK. I incorrectly assumed that snow fall was plugging the pipe.

Actually, snow buildup around the O.D. of the vent pipe acts as an insulator, helping to prevent the internal frost from closing things off.

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#929895 - 01/02/18 07:06 PM Re: Sewer Vents Freezing Over [Re: bearman]
dora Offline
Search and Rescue
Carpal Tunnel

Registered: 02/16/02
Posts: 22500
Loc: Somewhere under the sun
Maybe try increasing the diameter of the piping that's just below the roofline and above by installing a piece of 4".
_________________________
Life is about using the whole box of crayons!

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#930421 - 01/10/18 10:33 AM Re: Sewer Vents Freezing Over [Re: CabinConnection]
CabinConnection Offline
Bigfoot
Carpal Tunnel

Registered: 01/20/04
Posts: 52860
Loc: The Indianhead's Left Nostril....
I've been meaning to post these photos of a 2" vent that was prone to closing over from frost. Essentially I insulated the exposed 12" of vent. Seems to be working great.



Original:





Scrap 3" pipe cut to be flush with top of original:





Spray foam between 2" and 3" pipe (be careful not to overfill!):





Foam backer installed above spray foam (spray foam will deteriorate with sunlight):





There is also a 3" cap (the flat style, not the domed one) that goes over this, to further protect the foam from the elements. Center of the cap is cut out with a 2" hole saw.



If I were to do anything differently, I'd use black ABS pipe instead. Black will warm up more in sunlight, further aiding frost prevention.

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#930729 - 01/14/18 03:31 PM Re: Sewer Vents Freezing Over [Re: CabinConnection]
bearman Offline
member

Registered: 12/04/04
Posts: 115
Thanks for the photos, that's a big help. I do have a tin frost pipe over my vent pipe that is supposed to keep it frost free. It doesn't. I will add the insulation between the two pipes.
Thanks again.

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