Sewer Smell Outside Home from Roof Vent


Old 06-11-01, 10:10 PM
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Our sewer system is vented through the roof at 2 places (2 toilets) by way of 3" PVC. We have sewer smells which pool around the front of our house due to shape of roof and prevailing winds.

We've tried, at the recommendation of some plumbers, running a 5 foot offset in the attic (didn't work), and adding an additional lenght of pipe to raise above peak (we added 5 feet which took it about 2 feet above the peak) but that, too, failed.

It has been suggested to run the line through the attic to the back of the house and then up through the roof. That is doable.

I have thought about somehow slowing the venturi effect by adding a baffle or maybe adding a 90 degree elbow and aiming into southerly prevailing winds to reduce the venturi effect.

Do any of these sound workable or would they cause problems with the venting system?

With Kind Regards, Roy Graham
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Old 06-12-01, 05:34 AM
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are you on town sewarage or do you have a septic ?
you may be able to put in a back water valve which would be located right before everthing goes out of the house inexpensive and will keep you out of a hot attic!
check with the local plumbing inspector but it it a very common way to solve your problem .
mj boston plumber
Old 06-12-01, 10:29 AM
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install an air admittance valve

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