Vent branch in concrete slab

[Herbie123]

Hello everyone,

I believe I have plumbing problem and see if this can be resolved in a easy way,
for starters I have a superior wall foundation that is 4 ft high for a concrete slab I would like to know if the dashes represent a vent line underneath the slab to connect to a vertical vent pipe connection meaning can I come off a fixture with a drain and run the vent pipe on a 45 degree angle instead of running all my pipe in the walls? Kinda hard to explain but I can draw it out if need be,

Thanks.

 

[wwhitney]

I don't precisely follow the question, and the diagram is too small to make out, but perhaps this will help: a dry vent takeoff must connect to the top half of the horizontal trap arm pipe, and it must rise at least 45 degrees above horizontal until reaching an elevation at least 6" above the fixture flood rim.

So if the trap arm is below a concrete slab, and you want the vent to enter a wall without being exposed above the slab outside the wall, how close the trap arm has to travel to that wall before the vent takeoff occurs will depend on how deep the trap arm is below the slab. If it's 12" deep, then getting to closer than 12" from the wall should be sufficient.

Cheers, Wayne

 

[Sponsor]

 

[Herbie123]

I guess what I am trying to ask is can a went pipe run under a concrete slab? I have marked what I’ll call for now a circuit vent I have marked it in blue to show where it is, there is also a spot to bring it up thru a wall but the vent itself will serve a few fixtures.

 

[Herbie123]

I have been thinking about making sure the drain pipe was deep enough, but looking at the picture again there will be no drain line where the vent line is so it could just come up in a wall and not be exposed If I explained it correctly thanks for all your help in advance,

Herb.