The lavatory, WC and bathtub in the master bath are all independently dry vented (original construction 1965).
But the bathtub's drain and vent are inconveniently located in a wall where I want to make some unrelated changes. So I am considering wet venting the bathtub via the lav so that I can eliminate the tub's original drain and vent pipes in that wall. This change appears to be doable.
I created an isometric drawing for the addition of the tub wet vent in the master bath.
I have done my best to ensure the changes comply with the UPC for Minnesota.
changes:
- increase pipe diameter of vertical dry vent section above lav santee from 1-1/4" to 1-1/2" to accommodate 3 DFU: lav (1 DFU) + tub (2 DFU) (table 703.2)
- increase pipe diameter of vertical wet vent section below lav santee (and above tub santee) from 1-1/4" to 2" (section 908.1 Size (for wet vent))
- insert tub santee (2" x 2" x 2") below lav santee
- increase pipe diameter of vertical drain pipe below tub santee from 1-1/4" to 2" to accommodate 3 DFU: lav (1 DFU) + tub (2 DFU)) (table 703.2)
- change direction of tub's trap arm 180 degrees, away from the wall and toward the lav drain
- change tub trap arm pipe diameter from 1-1/2" to 2" since the distance from the redirected tub trap weir to the lav drain pipe will be 4'4" (52"; greater than 42" and less than 60"), [table 1002.2]; 2" trap arm pitched 1/4" per foot
- change tub trap ID from 1-1/2" to 2" [section 1003.3]
- replace lav santee with 1-1/4" x 1-1/2" x 2"
- cap off abandoned tub santee (original drain & vent pipes to be removed)
But the bathtub's drain and vent are inconveniently located in a wall where I want to make some unrelated changes. So I am considering wet venting the bathtub via the lav so that I can eliminate the tub's original drain and vent pipes in that wall. This change appears to be doable.
I created an isometric drawing for the addition of the tub wet vent in the master bath.
I have done my best to ensure the changes comply with the UPC for Minnesota.
changes:
- increase pipe diameter of vertical dry vent section above lav santee from 1-1/4" to 1-1/2" to accommodate 3 DFU: lav (1 DFU) + tub (2 DFU) (table 703.2)
- increase pipe diameter of vertical wet vent section below lav santee (and above tub santee) from 1-1/4" to 2" (section 908.1 Size (for wet vent))
- insert tub santee (2" x 2" x 2") below lav santee
- increase pipe diameter of vertical drain pipe below tub santee from 1-1/4" to 2" to accommodate 3 DFU: lav (1 DFU) + tub (2 DFU)) (table 703.2)
- change direction of tub's trap arm 180 degrees, away from the wall and toward the lav drain
- change tub trap arm pipe diameter from 1-1/2" to 2" since the distance from the redirected tub trap weir to the lav drain pipe will be 4'4" (52"; greater than 42" and less than 60"), [table 1002.2]; 2" trap arm pitched 1/4" per foot
- change tub trap ID from 1-1/2" to 2" [section 1003.3]
- replace lav santee with 1-1/4" x 1-1/2" x 2"
- cap off abandoned tub santee (original drain & vent pipes to be removed)
