Question about toilet venting requirements

ScottGibson · Oct 6, 2009

Hi All, I'm planning on adding a toilet in the basement of our house, The toilet will be about 24" from a vent stack. I was hoping to hook things up as indicated in the diagram below. Is this a valid way to hook it up? Or will I need an additional vent.

Thanks,

Scott

http://moddedreality.dreamhosters.com/public/plumbing%20diagram.png

jdgoodman · Oct 6, 2009

No you will need to vent the new toilet in the basement seperatly.

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Terry · Oct 6, 2009

The downstairs will need to be vented, and the waste from above needs to tie in below the first floor waste.

Helpful Plumbing Hints for Residential Construction by Bert Polk Plumbing Inspector Lincoln County

NHmaster · Oct 6, 2009

Something like this.

Gold star added by Terry

Basement_Lurker · Oct 6, 2009

If that really is a 4" stack with only one fixture on it (a shower perhaps?) on the second floor, then you could wet vent a toilet on the first floor. But a 4" line for just one fixture is overkill....you better verify what is connected to that line, otherwise, you will need to vent that toilet as nhmaster has shown.

NHmaster · Oct 7, 2009

No ya can't. You can't wet vent anything with fixtures above.

ScottGibson · Oct 7, 2009

Hey all, thanks for the feedback. My diagram simplified things a little. There is a toilet, shower and sink above. So I guess I need to find a way to tap into a vent line (I'll have to open up the wall in the floor above)

How far away from the toilet flange can I attach the 'Y' for the vent? I only have 24" before the stack.

Thanks again,

Scott

ScottGibson · Oct 7, 2009

Something like this?

hj · Oct 7, 2009

toilet

That is one way, but only a physical examination would tell if it was the best way. Where did the lavatory come from? That would have changed the above answers, even the wrong ones.

Question about toilet venting requirements

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