I'm roughing in the plumbing for my two story house before pouring the slab.
The downstairs bathroom will have a toilet, laundry sink, clothes washer
drain and shower. Everything drains to the 3" main under the slab.
Question: Can I combine the laundry sink 2" drain, with the clothes washer
drain shower drain or should it have it's own 2" pipe going to the 3"?
Combining all 3 on a 2" is probably going too far. Since you're
putting this in concrete I'd err on the conservative side. If you
have a toilet in that location it's not like you have far to go to get
to the 3". You don't have space to make the bath separate from the
laundry? From a resale perspective a lot of buyers like a 1/2 bath in
the downstairs more towards the front entrance. That's why when you
look on many plans it is very common to see them off halls near the
Take your plans down to your local building inspector or code
enforcement office and ask them if you're doing it right. It's their
job to make sure you don't do something really dumb. Most people in
those offices have a lot of practical knowledge, so take advantage of
it and you'll save time and money.
Does the part of your question "clothes washer drain shower drain" mean you
have a shower tied into your washer drain somehow ?
If so, I wouldn't ADD a laundry sink to it as well.
Combining a washer drain with a laundry sink drain (no shower) is done all
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