Acceptable Drain & Venting Solution?

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Acceptable Drain & Venting Solution?

Author: jasonc90 (CO)

Hi,

I have main level toilet, shower, tub & sink in 1 bathroom that I want to re-route how they drain in the basement. The tub & shower are pvc(which connect to the lead drain) but the toilet & sink are lead that go into the original cast iron DWV. My question is: If I change the toilet drain to pvc and route it like the diagram in the below picture link, is it acceptable for the toilet vent to go back and down to connect to the existing vent for proper venting?

Thanks,

Jason

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Re: Acceptable Drain & Venting Solution?
Author: steve (CA) Vents can not go down(except island vent) and you can't vent the toilet out the back of the tee. You can wet vent the toilet.
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Re: Acceptable Drain & Venting Solution?
Author: jasonc90 (CO) Thank you for your reply. Would it be acceptable to run a horizontal side vent out through an exterior wall window approximately 5-6 feet from the toilet slope drain?
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Re: Acceptable Drain & Venting Solution?
Author: steve (CA) I'm not fully understanding your question. Local code might require the vent pipe to extend above the roof and if it doesn't, there will be measured clearance distances that the vent pipe opening needs to be from any opening into the structure.
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