Proper use of DWV fittings for venting
This is a question mostly for Illinois guys, but curious about practices in other areas as well.
I came across an installation recently where I questioned 2 vent connections in the attic. The first was a 2 x 1-1/2 x 2 san tee on it's side, with the branch going toward the vent stack and both ends of the run picking up vents from below. (See first pic). On the other, there was a 3" combo directly below the VTR. The inlet of the run was bushed down to 2", again picking up vents from below. (See 2nd pic).
Am I wrong in thinking that these fittings are installed incorrectly?? If the 2" on the run on the tee and the 3" outlet of the combo are pitched down, then the inlets of these are pitched up (even if the pipe is flexed enough to pitch down). He said it was common practice. His argument was that any water in the vents still drains back to the waste stack.
Thoughts?
I came across an installation recently where I questioned 2 vent connections in the attic. The first was a 2 x 1-1/2 x 2 san tee on it's side, with the branch going toward the vent stack and both ends of the run picking up vents from below. (See first pic). On the other, there was a 3" combo directly below the VTR. The inlet of the run was bushed down to 2", again picking up vents from below. (See 2nd pic).
Am I wrong in thinking that these fittings are installed incorrectly?? If the 2" on the run on the tee and the 3" outlet of the combo are pitched down, then the inlets of these are pitched up (even if the pipe is flexed enough to pitch down). He said it was common practice. His argument was that any water in the vents still drains back to the waste stack.
Thoughts?
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