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-   -   Bathroom Venting/Waste design outline (http://www.diychatroom.com/f7/bathroom-venting-waste-design-outline-125261/)

AJA 12-01-2011 05:06 PM

Bathroom Venting/Waste design outline
 
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I am re-designing a bathroom and by extension the plumbing has fallen into my hands. But I have come across several questions and I am getting too many "that won't be a problem" type responses.

My main aim was to use direct venting rather then add additional venting pipes since the distances seem to adhere to code based on pipe size. I was planing on running a 3" pipe from bathtub so that distances are within code.

I can either run them separately to the main stack at different heights, or connect them to the same horizontal branch.

Can I connect two drains (bathtub/toilet) to the same vertical waste/vent stack at different heights? If so, does it matter which one is on top?

or can

Can I connect both bathtub and toilet to same horizontal branch that would lead into the vertical waste/vent stack, without an independent vent in between or before? In other words use direct venting for both running on the same branch.

I have found variations but generally I can run at least 8' vertically without a vent for a 3" pipe.

Thanks for the advice.

TheEplumber 12-01-2011 11:11 PM

Can you tell us what plumbing code you are referencing and where you live? Most of your description wouldn't fly in my neck of the woods

AJA 12-02-2011 01:38 PM

Code and Location
 
The property is located in Saint Peters Missouri.

IRC 3105.1 Maximum Distance of Fixture from Trap Vent

For 2" size trap it gives a distance of 8 feet.


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