BuilderOKC
New Member
The attached picture is the current configuration for a back to back identical bathroom. The Horizontal main is 3" and is under a slab. My question is if all the 1.5in venting and fittings are changed out to 2" would it pass ipc? I am a GC and am working up an estimate for this remodel and just wondering if we are going to need to tear up the slab at all to bring this up to code. Thanks