I am wondering if a 1.5" vent is adequate for a single water closet. The vent is in the wall immediately behind the water closet, goes vertical into the upstairs story and turns above the ceiling to tie in with a 2" vent before traveling over to the 3" stack. I know the code says 1/2 the size of the drain, and this is the only fixture on this vent before it ties in to the 2". The MN state code has a note in the table where a 1.5" vent capable of 8 units, is noted with 'except water closets'.
The upstairs wall travel and turning above the ceiling upstairs would be so much less difficult with a 1.5", and I could make a 2" work. My question is really about the adequacy of the venting. I want the flow out of that water closet to be optimized - so would a 1.5" versus a 2" vent make ANY difference? Thank you.
The upstairs wall travel and turning above the ceiling upstairs would be so much less difficult with a 1.5", and I could make a 2" work. My question is really about the adequacy of the venting. I want the flow out of that water closet to be optimized - so would a 1.5" versus a 2" vent make ANY difference? Thank you.