Venting basement bathroom
Hi all,
First time here. I am finishing my basement in Milwaukee. The washer dumps into a sink which has a 2" line that y's into a 4" drain that is stubbed up from the slab. This is not the main stack. The 4" ties to the main 4" about 12' away under the slab.
The 4" stub rises from the floor about 4' and is then reduced to a 2" which is the drain from the kitchen sink. From the sink it becomes a dry vent which is tied to the main stack vent in the attic.
I want to put in a toilet, shower and sink. The toilet will Y into the 4" in the horizontal run about 4' from where the pipe turns and comes up. The shower would be the same. The sink would tie into the 4" above the slab.
From what I have read, the 2" from the sink would be a wet vent for the sink.
My question is can I vent the toilet and shower into the 2" wet vent from the kitchen? A second option would be to tie them into the dry side of the vent in the kitchen above where the sink ties in? The best option would be that the below grade ties would be vented from the 4 to 2 wet vent and no additional venting would be required. If I am not making sense, I can post a dwg that may clarify. Thanks for any input.
Scoot
Venting basement bathroom
Quote:
Originally Posted by SCOOT
Hi all,
First time here. I am finishing my basement in Milwaukee. The washer dumps into a sink which has a 2" line that y's into a 4" drain that is stubbed up from the slab. This is not the main stack. The 4" ties to the main 4" about 12' away under the slab.
The 4" stub rises from the floor about 4' and is then reduced to a 2" which is the drain from the kitchen sink. From the sink it becomes a dry vent which is tied to the main stack vent in the attic.
I want to put in a toilet, shower and sink. The toilet will Y into the 4" in the horizontal run about 4' from where the pipe turns and comes up. The shower would be the same. The sink would tie into the 4" above the slab.
From what I have read, the 2" from the sink would be a wet vent for the sink.
My question is can I vent the toilet and shower into the 2" wet vent from the kitchen? A second option would be to tie them into the dry side of the vent in the kitchen above where the sink ties in? The best option would be that the below grade ties would be vented from the 4 to 2 wet vent and no additional venting would be required. If I am not making sense, I can post a dwg that may clarify. Thanks for any input.
Scoot
Hey Scoot,
Let me solve your venting questions right now. For openers you can not wet vent a kitchen sink or a bath room lavatory. To do so would be to install a "S" trap and "S" traps are outlawed in every plumbing code going. What you may do, however, is to tie the toilet into the 4" wye and the vented lavatory downstream into the 4' horizontal pipe from the toilet and tie the shower drain back into the lavatory drain so it will be wet vented. The lavatory vent can revent back into the dry side of the kitchen vent at least 6" over the flood rim of the sink. Or if that's not handy consider a spring loaded mechanical vent to vent your bath group. This way your job will be vented legally. Good luck on a major project. Tom
