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Author:
sum (FL)
I have a situation where a bath didn't have a vent except an AAV and it was buried inside the cavity of an exterior block wall.
If I can extend the vent pipe upward through the voids of the block wall as high as possible, just before it reaches the tie beam, I punch a hole so the pipe turns and exits on the outside of the wall, then it I extend it further out past the roof overhang, then turn a 90 to go up say another 24" or so.
Is this allowed, to not run the pipe through the narrow attic space and through the roof, but extend beyond the roof overhang then go up? Other than it may be an eye sore what is the drawback?
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Author:
bernabeu (SC)
discounting eyesore and assuming proper 'backpitch' you are good-to-go
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
hj (AZ)
It will work in Florida, it would not work in Maine.
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Author:
sum (FL)
Why not in Maine? Because a lobster could crawl up the vent line and drop down the pipe?
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Author:
hj (AZ)
No, because in a cold area, with that much pipe exposed to the elements, hoar frost would build up and close the vent. In those areas there are three factors at work to minimize the risk.
1. The pipe size is increased going through the roor so there is more area that would have to be covered
2. The "heat", even as little as there might be, rising from the attic reduces the accumulation of hoar frost. and,
3. The amount of pipe exposed above the roof is very small/short.
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Author:
packy (MA)
The amount of pipe exposed above the roof is very small/short.
18 to 24 inches thru the roof is minimum in MA. too short and it will be covered by a deep snowfall.
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Author:
hj (AZ)
The warm sewer gases should melt it away. In Chicago it was 12".
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Author:
bernabeu (SC)
in NYC used to be 24" and 4" pipe (if memory serves)
if roof was 'populated' then 7' tall
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
hj (AZ)
The standard that I grew up with was "increased one size going through the roof and minimum 4 inch".
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