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Old 12-01-2011, 05:06 PM   #1
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Bathroom Venting/Waste design outline

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.
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Old 12-01-2011, 11:11 PM   #2
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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


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Old 12-02-2011, 01:38 PM   #3
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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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