DIYer123
New Member
I am in the process of remolding our main floor bathroom and I am re-plumbing the double vanity drains. The drain originally were plumbed into a 2" drain stack via two sanitary tees, one ontop of the other. The two 2" stack continues up and ties into the main vent above the ceiling in the attic and is a vent only (this 2" does not act as a drain for anything upstairs). The three main reason for re-plumbing the sinks were:
1.) The stacked tee configuration put the traps at different elevations and the lower tee put the trap almost at the bottom of the vanity floor making trap removal a pain.
2.) There is a heating return duct in the wall directly behind one of the vanity sinks so the original plumbing had jogged into the back of the vanity at some shallow angle needing an ugly hole in the vanity back and a sloppy looking configuration at the trap.
3.) My wife wanted recessed medicine cabinets and lights above the mirrors and I had the room to build the wall out.
After doing extensive reading I decided to the following:
Per plumbing code the vent branch should be 6" above the flood rim of the fixture. so for me that 42".
Question 1: Where on the wye is that measured? I assume that is where the water would flow over the rim of the inverted wye, is this correct?
Question 2: This would put my wye into my recessed mirror still, given I could have just jogged out the drain and jogged the vent back would this really be subject to the 6" rule given the setup of the vents?
I have attached a picture of the 42" setup in its unglued state, ideally I would like to lower the inverted wye a few inches if it is a non issue to let me not worry about the mirror interference.
1.) The stacked tee configuration put the traps at different elevations and the lower tee put the trap almost at the bottom of the vanity floor making trap removal a pain.
2.) There is a heating return duct in the wall directly behind one of the vanity sinks so the original plumbing had jogged into the back of the vanity at some shallow angle needing an ugly hole in the vanity back and a sloppy looking configuration at the trap.
3.) My wife wanted recessed medicine cabinets and lights above the mirrors and I had the room to build the wall out.
After doing extensive reading I decided to the following:
- Cut the 2 - 2 x 1-1/2 sanitary tees out of the stack
- Installed a 2 x 2 wye in the vertical low to the floor to bring the 2" stack into the new wall location and continue the original stack up
- Installed a 2 x 1-1/2 double fixture tee in the jogged out drain location
- Tied the new 1-1/2 fixture vent and original 2" vent back together with an inverted 2 x 1-1/2" wye
Per plumbing code the vent branch should be 6" above the flood rim of the fixture. so for me that 42".
Question 1: Where on the wye is that measured? I assume that is where the water would flow over the rim of the inverted wye, is this correct?
Question 2: This would put my wye into my recessed mirror still, given I could have just jogged out the drain and jogged the vent back would this really be subject to the 6" rule given the setup of the vents?
I have attached a picture of the 42" setup in its unglued state, ideally I would like to lower the inverted wye a few inches if it is a non issue to let me not worry about the mirror interference.
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