Ken Dahl
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I am doing a bathroom add-on to the second floor of a two-story home. Thus, my
options are a bit limited as far as where I put the drain lines and drain stack.
This all boils down to the use of a wye to combine the toilet drain and other bathroom drains on a horizontal. I just don't know how to do it.
I have a 3 inch stack that has been prepared especially for the new upstairs bathroom. So I need to drain a toilet, lav, and shower to the same place if possible, i.e. all three draining to the same horizontal line and into a 3 inch san tee. I planned to have the toilet flange about 2 feet from this soil stack.
The stack and the 3 inch sanitee I need to dump into. Notice the 10 inch spacing:
I was going to use this stack vent for the toilet. I guess if the toilet is vented elsewhere (see below) then this vent would not be necessary.
I attached a drawing of the floorplan. The shaded red/pink area is where the soil stack is. Note the double wall there (a 2x4 and a 2x6). I also took some pictures of my dry run.
Closeup:
From the foreground:
At some point I thought that the closet bend was going to be super close to my planned 2x3x3 inch Wye. But at the current configuration, I had to cut a 9 inch pipe. I guess I should ask if this is ever a permitted situation before I ask about the 9 inch spacing. With some work, I could reduce the distance from the closet bend to the wye to virtually nothing.
If this configuration won't fly, maybe I could replace the closet bend with a side-inlet 3x3x2 elbow? And send the lav/shower into the side of that fitting?
Or if I increased the size of drain/venting for the lav to a 2 inch, would that now make the toilet wet vent back upstream through the lav's stack? I believe this would be around 4 feet of wet venting for the toilet.
I guess if the wet venting is a problem, I could start the 3 inch drain where the lav is... since I was using a 3x3x3 wye with a 2x3 bushing anyway. Does a bushing cause this type of vent to be restricted?
options are a bit limited as far as where I put the drain lines and drain stack.
This all boils down to the use of a wye to combine the toilet drain and other bathroom drains on a horizontal. I just don't know how to do it.
I have a 3 inch stack that has been prepared especially for the new upstairs bathroom. So I need to drain a toilet, lav, and shower to the same place if possible, i.e. all three draining to the same horizontal line and into a 3 inch san tee. I planned to have the toilet flange about 2 feet from this soil stack.
The stack and the 3 inch sanitee I need to dump into. Notice the 10 inch spacing:
I was going to use this stack vent for the toilet. I guess if the toilet is vented elsewhere (see below) then this vent would not be necessary.
I attached a drawing of the floorplan. The shaded red/pink area is where the soil stack is. Note the double wall there (a 2x4 and a 2x6). I also took some pictures of my dry run.
Closeup:
From the foreground:
- A 2x2 san tee with a 1 1/2" vent for the shower
- That's a 2 inch pipe horizontal, carrying shower waste
- A 2x2 combo with 1 1/2" swept in for the lav drain.
- More 2 inch pipe, carrying shower+lav waste
- A 3x3x3 wye, 2" main inlet, 3" inlet from toilet
- To the left is the toilet flange to a closet bend (hidden)
- The 3" drain continues to the waste stack, but it needs a horizontal 45 degree turn to get there
- The 3" waste stack has a 3x3x3 san tee, with a 2 inch bushing on the top for the vent.
At some point I thought that the closet bend was going to be super close to my planned 2x3x3 inch Wye. But at the current configuration, I had to cut a 9 inch pipe. I guess I should ask if this is ever a permitted situation before I ask about the 9 inch spacing. With some work, I could reduce the distance from the closet bend to the wye to virtually nothing.
If this configuration won't fly, maybe I could replace the closet bend with a side-inlet 3x3x2 elbow? And send the lav/shower into the side of that fitting?
Or if I increased the size of drain/venting for the lav to a 2 inch, would that now make the toilet wet vent back upstream through the lav's stack? I believe this would be around 4 feet of wet venting for the toilet.
I guess if the wet venting is a problem, I could start the 3 inch drain where the lav is... since I was using a 3x3x3 wye with a 2x3 bushing anyway. Does a bushing cause this type of vent to be restricted?