plumbing question for basement bath (floors, washer, heater, sink)

[SuperDave72]

We are putting a bathroom in our basement.

Question about the plumbing vent. There is a plumbing vent already present for the utility sink and washer. Is it acceptable to tie into that for the toilet and sink in the bathroom we are building?

[K'ledgeBldr]

It depends what size it is, and how far from the new fixtures.

Was the basement not roughed-in for a bath?

[SuperDave72]

Originally Posted by K'ledgeBldr

It depends what size it is, and how far from the new fixtures.

Was the basement not roughed-in for a bath?

No, it was not.

The new bath is right next to the laundry area. Maybe ~6' max away from the existing vent.

[K'ledgeBldr]

6' is the MAX for a toilet. And, a 2" vent is the bare minimum at that distance- but I'd do 3" if possible. The sink could run 3-1/2' with standard 1-1/2"; or go to 2" and it can run 5'.

Again, what size is the vent/drain you are looking to tap?

[SuperDave72]

Originally Posted by K'ledgeBldr

6' is the MAX for a toilet. And, a 2" vent is the bare minimum at that distance- but I'd do 3" if possible. The sink could run 3-1/2' with standard 1-1/2"; or go to 2" and it can run 5'.

Again, what size is the vent/drain you are looking to tap?

Looks like 1.5”.

[K'ledgeBldr]

Originally Posted by SuperDave72

Looks like 1.5”.

That ain’t happenin’!

[SuperDave72]

All right. I’m just not sure how to get a vent pipe through two finished floors up to the roof.

May have to actually call a plumber for this one.

[dijkstra]

Use an air admittance valve in the wall. You may hear them called "cheater valves" and they are used for just this sort of circumstance.

[carcrazy67]

Although a lot of people do it, an AAR (air admittance valve) should not be used for a toilet!!! A lot of jurisdictions do not allow their use for a toilet. Think about what happens if the AAR fails!

[dijkstra]

Originally Posted by carcrazy67

Although a lot of people do it, an AAR (air admittance valve) should not be used for a toilet!!! A lot of jurisdictions do not allow their use for a toilet. Think about what happens if the AAR fails!

You get air suction through the toilet itself if it fails in the closed position. If it fails in the open position, you will may get sewer vapor/smell back flow into the area. In that case, you will smell it and simply replace the AAR with a new one. Been there done that and it is really no big deal. Takes maybe two minutes to replace one.