Pat L
New Member
Hi,
I recently needed to move one of my basement stacks by a few inches during a remodel. I took the opportunity to bring the washer drain up to code, and replace the 1-1/2" ABS with 2"ABS. Not wanting to break open the entire wall in my main floor laundry, I used a reducing coupling to connect to the 1-1/2" vent. Now, the p-trap is siphoning at the beginning of a cycle (I can smell sewer gas). At the start of the drain cycle after the wash, the trap re-fills and the smell disappears. It's fine until the next time the washer is used. I didn't change anything else about the run to the stack (angles, slopes, etc.).
The standpipe is 30", runs into a p-trap, into the wall, 2 x 22.5 separated by 2 fingers, 4" into a sanitary tee, into the floor, 45 to a horizontal wye w/cleanout, then 7' @ 1/4" slope into another 45, then into the stack via a wye.
I'm thinking about disconnecting the 1-1/2" vent and installing an AAV rated for a washing machine a few inches above the weir.
Before I cut another hole in the wall, any thoughts on what might be causing this, and other potential solutions?
Thanks!
I recently needed to move one of my basement stacks by a few inches during a remodel. I took the opportunity to bring the washer drain up to code, and replace the 1-1/2" ABS with 2"ABS. Not wanting to break open the entire wall in my main floor laundry, I used a reducing coupling to connect to the 1-1/2" vent. Now, the p-trap is siphoning at the beginning of a cycle (I can smell sewer gas). At the start of the drain cycle after the wash, the trap re-fills and the smell disappears. It's fine until the next time the washer is used. I didn't change anything else about the run to the stack (angles, slopes, etc.).
The standpipe is 30", runs into a p-trap, into the wall, 2 x 22.5 separated by 2 fingers, 4" into a sanitary tee, into the floor, 45 to a horizontal wye w/cleanout, then 7' @ 1/4" slope into another 45, then into the stack via a wye.
I'm thinking about disconnecting the 1-1/2" vent and installing an AAV rated for a washing machine a few inches above the weir.
Before I cut another hole in the wall, any thoughts on what might be causing this, and other potential solutions?
Thanks!