[crankcase]

Here's another pic and some clairification:

1: Yes Mike, the plan is to run a vertical 3" vent for the toilet.

2: Bathroom sink drain was changed to reflect this drawing to drain horizontally in exterior wall and dump into the 3" vent stack. Each sink was planned to have a 1.5" vertical vent, then all venting tied together in the attic.

3: Can't bust up concrete, radiant tubes in floor for heat.

4: Not concerned with passing inspection. See #5

5: A pic won't really help at this point. As there is nothing to see. All of my piping was plumbed and vertical stubs held 1" under the concrete and then capped and wrapped with a good layer of foam. Everything was precisely measured and concrete was poured. Building inspector unaware of any plumbing as building was built. This is my garage. Now I'm chipping out my plumbing and framing interior walls.

 

[crankcase]

Well if there's no way to fix it, whaddaya doin' here? :jester:

I've never installed radiant heat before, but I don't see any reason why you couldn't break open the concrete to add a vent fitting. :huh:

I guess what concerns me more than the pipes in the floor is the fact that My slab has a thickened edge, or the term around here is an "engineered slab". So I wouldnt want to bust it up at an exteror wall. My best bet if absolutely needed would be to come up in the side wall just to the right of the shower bay.

If I go thru this, will I absolutely without a doubt get better drain performance at the shower rather than wet venting from the kitchen sink to the right of the bathroom?