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Author:
scooty (IN)
We get a sewer gas smell once in awhile. I finally opened up the wall and looks like the vent is directed back to drain line above the trap. What are my options to fix this.....can I let it vent into the wall?
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Author:
bernabeu (SC)
no
depending on local code you may either:
vent to atmosphere above roofline (best practice)
or
install an AAV (air admittance valve) in a serviceable location
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
Doug E. (CA)
not sure from your description on how this is plumbed.
But NO....do not leave your vent open in your wall!!
you can use an Air Admittance valve there as long as it is left accessible for change out when needed.
post a pic for better responses.
Edited 1 times.
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Author:
m & m (MD)
A photo would be helpful, but you seem to be describing a "loop" type of fixture vent.
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Author:
scooty (IN)
Not sure how to post a picture. Drain line goes into a trap and then there is a vent line coming off the drain line below the trap which is then plumbed back into the drain line above the trap. So basically it is making the trap useless. Sounds like the aav is what I need how often do those need replaced or serviced?
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Author:
North Carolina Plumber (NC)
Expect 20 years or more. Just cut the vent pipe after the trap, extend it up in the wall to a height above the opening of the standpipe and put your AAV there. Replace the drywall and use a small grill to provide access and fresh air for the AAV.
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Author:
bernabeu (SC)
there are good quality code approved AAVs and there are 'big box store' junk
get the AAV from a plumbing supply
==============================================
"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
Edited 1 times.
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Author:
scooty (IN)
Gentlemen thank you for your input and knowledge! I appreciate it very much.
Edited 1 times.
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Author:
hj (AZ)
Your description, if accurate, implies that the system was installed by an incompetent DIYer or handyman. You have to disconnect if from the standpipe riser and cap the opening in the riser. Then assuming you cannot install a proper vent, you can attach an AAV to the pipe you disconnected.
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Author:
hj (AZ)
"Loop vents" do NOT connect back ahead of the trap.
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Author:
scooty (IN)
Not easily possible to direct vent this line so leaning towards the AAV.
However wanted everyone's opinion if that is my best option or if you see other solutions.
This wall does not have access to the roof.
Thank you
Edited 5 times.
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Author:
bernabeu (SC)
ABSOLUTELY WRONG - bordering on insanity
Use the existing vertical from the 'stack' for the AAV (as high in wall as possible leaving room for 'grill access')
remove the 'abortion' from the standpipe and redo w/ plain PVC
voila, done
==============================================
"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
Edited 6 times.
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Author:
sum (FL)
wow, very interesting.
sort of defeating the purpose of the p-trap, you should be smelling sewer gas from that loop.
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Author:
bernabeu (SC)
The OP WAS smelling sewer gas, that was his problem
==============================================
"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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