[Crowe09]

I have a slab house and am updating a bathroom which will include a washer/dryer in it. I have a 1 1/2 inch drain available for both the sink and washer to use. The washer is a high efficiency/low water model, and the faucet uses 1.5 gpm. Should I be OK to put both drains into the 1 1/2 inch pipe?

[speedball1]

Neither the sink or the washer should discharge into a 1 1/2" drain line. The newer codes mandate a 3" line for the kitchen and the washer should tie into that with a 3 X 2 wye or combo. Do it right the first time and you won't be going back the second. Good luck. Tom

[Crowe09]

Well, with it being slab, it is not in the budget to go ripping up the concrete, and the washer drains into that 1 1/2 inch now. There will be no inspection on the project and it just needs to work, not be up to current code. Being an electrician for 10 years, I am well aware that most codes are over the top and not necessary for things to actually function properly. It is only a small 1000 sqft single bath dwelling, what issues might I run into if I proceed?

[speedball1]

well, with it being slab, it is not in the budget to go ripping up the concrete, and the washer drains into that 1 1/2 inch now. there will be no inspection on the project and it just needs to work, not be up to current code. Being an electrician for 10 years, i am well aware that most codes are over the top and not necessary for things to actually function properly. it is only a small 1000 sqft single bath dwelling, what issues might i run into if i proceed?

I see your problem. If there's no backups from the washer then you should be OK. Good luck Tom.