Yes, exactly like this. When I took the picture it was during my pre-drywall inspection. The wall is finished now so I will need to cut into the sheetrock. I really do not care about any inspections as it will be my home for a long time. I just want to make sure it will drain correctly.You mean like this?
View attachment 35180
You don't indicate where you are, but in Ontario Canada, this is apparently legal. I wanted to do this very thing, but I couldn't find in the various codes in the US where this is allowed. And like you, I would think a wye instead of a sanitee would be more appropriate for the connection to the washer standpipe. I've also seen some references that limit the tub drain line to 30 inches, which seems a little strange as there is no P-trap in that line to keep filled. Logic would also say that the tub drain line could be at a slope more than 1/4 inch/foot as there is not P-trap to worry about siphoning dry, and perhaps should be at a steeper slope for better drainage and to reduce washing machine backup into that line during the washing machine pump out cycle.
Maybe some other member can answer this question with specific references, as I would be most interested.
Enter your email address to join: