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"?
Thanks, Bob