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Old 09-18-2012, 10:17 AM   #1
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Installing a plumbing vent on a basement bathroom


Hi there,

I'm new to the forum and have a plumbing question.

I'm installing a bathroom in my basement - the builder had originally installed a 2-piece rough-in which I am taking out and replacing with a 3-piece bathroom (toilet, shower and sink).

I've broken the concrete floor and exposed a five foot section of the 4" PVC pipe. The upstream end of this pipe is fed by a bathroom on the 2nd floor.

When the builder had installed the 2-piece rough-in, he had installed a tee-wye on this section of PVC. Feeding into the wye was the toliet rough-in and a 2" vent pipe, which came out from the wye below the concrete and then vertically up the adjacent wall. Feeding into the vertical part of the vent is a 1.5" sink drain.

My questions is this: I will cut the PVC and remove a 3 foot section. At the downstream end, I'll install the rough-in for the toilet - a sanitary tee and 3" ABS coming up to connect the flange. At the upstream end, I will rough in the shower drain and connect the air vent just slightly downstream from the shower drain. Do I need to connect another vent for the toilet, or can I get away with just the one vent?

Any help is appreciated.

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Old 09-18-2012, 01:50 PM   #2
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Installing a plumbing vent on a basement bathroom


a drawing or pictures would help a lot.

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Old 09-18-2012, 02:28 PM   #3
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Installing a plumbing vent on a basement bathroom


Here is a quick sketch - hope it helps.Installing a plumbing vent on a basement bathroom-basement-bathroom-rough-.jpg
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Old 09-21-2012, 11:22 AM   #4
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Installing a plumbing vent on a basement bathroom


Any suggestions from anyone?
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Old 09-21-2012, 08:18 PM   #5
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Installing a plumbing vent on a basement bathroom


1) A general rule according to IPC code is as long as a fixture is within 8ft of linear pipe it will be properly vented

2) Your vent needs to be at least 2 in i.d. to provide the needed amount of air

3) I cannot tell if you drawing is oriented vertically or laid down horizontally, san-tees CANNOT be laid on their sides or on their backs! In this situation a wye or combination fitting must be used!

4) ABS AND PVC ARE NOT COMPATABLE! I highly recommend you keep materials consistant.

5) All rubber couplings must be of the type with the sheilded bands, and tightened to the specs of the given coupling
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