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Author:
mcberry (MI)
I'm in the initial planning stages of putting in a basement 2 fixture bathroom. I'm in Michigan and my township follows IPC 2012.
The blue lines in my drawing represent my thinking, up to this point, on toilet and sink plumbing (sorry about my poor attempt at 3D perspective). The straight line on the floor leading to the stack is an existing waste line underneath the floor. I would like to tap into this for the toilet rough in.
The sink waste line I'm hoping to tap into the main stack. The sink vent line, as drawn, will go up and out of the basement, eventually tying in with the vent from the half bath directly above this, then up and out of the house.
Problem is - I don't know if this is logical and I don't think the toilet is vented appropriately, so looking for any other thoughts.
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Author:
steve (CA)
If you drain the sink into the horizontal pipe between the toilet and the stack, the sink drain becomes a wet vent for the toilet and then continue the vent up like you show, either tying into an existing vent pipe for an above floor fixture or running the sink vent through the roof.
I just realized the stack drains behind the toilet, so the sink tie-in would be need to be before the toilet hits the horizontal main drain from the stack. Do you know how deep the horizontal drain is? Is that an exterior wall behind the insulation?
Edited 1 times.
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Author:
hj (AZ)
The toilet is NOT vented, but it might be difficult to tie the lavatory into the toilet drain line to become its vent.
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Author:
mcberry (MI)
Thanks for the feedback. I think you're right - that it may be tough to find room to wye in a vent and wye in the toilet waste line - considering the lack of space.
I may open up the floor to get a closer look what I'm dealing with and see if I can find a way to get the toilet vented from where I want it. Worst case scenario I patch the hole and move the bathroom where there's a bit more room to work.
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Author:
steve (CA)
Was the stack going to be buried in a new wall or boxed in? What about off-setting the stack and have it tie back into the horizontal drain, close to the back wall? This will provide free space in the area behind the toilet, for the toilet drain and venting.
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