New Guest Bathroom

[pinter]

Hi,
I'm moving a laundry room and installing a guest bath on a first floor. I can't drain or vent behind the toilet without pushing the wall out some 8-10 inches where I really don't have the room to lose.

I want to vent through a shared wall but I'm not sure this is OK. I attached a sketch. The back wall is over the house foundation, and both rooms are in a breezeway addition over a crawlspace. The sub-flooring is all new and I still have easy access below. The floor drain is optional, I was going to add one to the laundry area while I'm at it.

The framing is ready to go as soon as I have a plumbing plan. I would appreciate any help.

Thanks.

 

[Cacher_Chick]

A washer trap goes above the floor. Every fixture/trap must have a vent. No vent can be horizontal until it reaches a point at least 42" above the floor.

 

[Sponsor]

 

[pinter]

OK, move the washer vent to intersect with the sink vent at least 42" from the floor.

Can the washer wye into the 2" vertical?

 

[Cacher_Chick]

Maybe I am looking at your drawing wrong, but a trap's vent is always placed in it's trap arm, which is downstream of the trap.

 

[pinter]

Yeah, you're right. Not sure what I was thinking. Install the P-trap at (5), then can I run into the vertical without a dedicated vent loop?
I found a table in the UPC that says 2" can run a max of 5 feet horizontal to a vent, 1 1/2" can run 42". Can I remove the vent loop on the sink too? I left it in for now.
Thanks for all your help. Once this is designed I'll post some pics before gluing it up.

 

[Cacher_Chick]

If it is a laundry sink drain, it should be 2". Only a lavatory drain would be 1-1/2". How about venting the water closet?

 

[pinter]

OK, I put WC vent back in place and drains are on their own line again.

The sink is a lav drain, vanity or pedestal in the bathroom.