Odors vent pipe

Published on August 22nd, 2017 | by Henri

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Sewer odor after heavy rain

Q.  Thank you for the help in the past! I have a new issue that I would appreciate your help with. I have a 2 story house with well and septic. For about the past 2 years, I have noticed what seems to be sewage odor in both floors. It seems to happen more frequently after several days of heavy rain. But, sometimes not. And to further the cause, we won’t smell an odor for several months. Every fixture drains adequately and the tank gets cleaned every 12–14 months. The toilet and wax ring have been recently replaced. What are your thoughts about this problem?
Thank you!

A.  Is the sewer odor only smelled during the season when the windows are opened? If so, it is likely to be coming from outside through the roof vent when the atmospheric pressure changes, common during periods of rain and low pressure. The odor enters the house through the lower windows and rises throughout the house by means of the stack effect – warm air rises and exits the second floor windows while outside air enters through the first floor windows.

In that case, try having a 90 degree collar installed over the roof’s vent stack and turning it facing into the prevailing winds. Do not cement this collar to the vent as you may want to adjust it if the original positioning does not correct the problem.

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