I want to move the toilet and shower drains in the concrete slab. I have broken up the concrete slab and will extend the 3" toilet drain about 48" to one side with a 90 elbow.
I would like the new 2" shower drain to tie into the toilet drain connecting right at the 90 elbow. Do I need to add a 1.5" vent pipe anywhere? If so how and where do you do this under a concrete slab?
Edmonton, Alberta
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