I'm currently doing some work on the basement bathroom. I am relocating the shower drain a few inches for these reasons:
1. increasing shower size and moving drain will keep it centered
2. you really hear water in the drain when a toilet upstairs is flushed. I believe the venting to be inadequate
When I first opened the walls, I found these two stacks with the cleanout buried behind the drywall. The lav is 1.5" copper and tees into the 2" CI tee. Around 5' or so above the floor, the piping transitions to copper. My first thought was this 2" line was wet venting the bathroom group. Okay..no problem. However, you can see from the drawing that I did that I have a major fixture discharging past this unvented shower drain. The 3" stack that is near the condensate line receives discharge from 2 WCs, 2 lavs, and a shower/tub combo.
So, the next thought is just do a dry vent for the shower and connect 6" above the flood rim of the lav into that 2" line. However, it turns out that 2" "vent" is also the drain for a pair of lavs on the 2nd floor (not sure why they didn't use the nearby 3" for the 2nd floor lav drains). I know that having a wet vent between different floor levels is not code here.
I could turn that 2" wet vent into a dry vent by draining the two 2nd floor lavs into the 3" line, but that would be down the road when I renovate the 2nd floor bath. Running a new vent to the attic would be very difficult is it would have to run from the basement on a two storey house. There is a dry vent at the kitchen sink above this area, but again that would require tearing up the kitchen walls to tie into the vent.
AAVs are legal here, but would prefer a normal vent. I just don't know if there is a easy way to do so.
Could I come up and tie into the 2" above the flood rim of the basement lav (6") using a tee and maybe putting a AAV on the tee? I know the AAV needs to have ventilation and be accesible. Then when I turn that 2" into a true dry vent, I can remove the AAV and plug off that part of the tee to make a normal vent.
I don't know if this makes sense. I can try to add some more pics or diagrams if something is not clear.
Thanks!
Kent
1. increasing shower size and moving drain will keep it centered
2. you really hear water in the drain when a toilet upstairs is flushed. I believe the venting to be inadequate
When I first opened the walls, I found these two stacks with the cleanout buried behind the drywall. The lav is 1.5" copper and tees into the 2" CI tee. Around 5' or so above the floor, the piping transitions to copper. My first thought was this 2" line was wet venting the bathroom group. Okay..no problem. However, you can see from the drawing that I did that I have a major fixture discharging past this unvented shower drain. The 3" stack that is near the condensate line receives discharge from 2 WCs, 2 lavs, and a shower/tub combo.
So, the next thought is just do a dry vent for the shower and connect 6" above the flood rim of the lav into that 2" line. However, it turns out that 2" "vent" is also the drain for a pair of lavs on the 2nd floor (not sure why they didn't use the nearby 3" for the 2nd floor lav drains). I know that having a wet vent between different floor levels is not code here.
I could turn that 2" wet vent into a dry vent by draining the two 2nd floor lavs into the 3" line, but that would be down the road when I renovate the 2nd floor bath. Running a new vent to the attic would be very difficult is it would have to run from the basement on a two storey house. There is a dry vent at the kitchen sink above this area, but again that would require tearing up the kitchen walls to tie into the vent.
AAVs are legal here, but would prefer a normal vent. I just don't know if there is a easy way to do so.
Could I come up and tie into the 2" above the flood rim of the basement lav (6") using a tee and maybe putting a AAV on the tee? I know the AAV needs to have ventilation and be accesible. Then when I turn that 2" into a true dry vent, I can remove the AAV and plug off that part of the tee to make a normal vent.
I don't know if this makes sense. I can try to add some more pics or diagrams if something is not clear.
Thanks!
Kent
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