DIY'er looking for advice/help! Shower has been leaking into the basement, so it was finally time to demo. Plan is to recess the subfloor, and install curbless shower with glass 90 and a shower door. Tub will be a freestanding unit. This leaves me with my question(s)? What is the proper way to vent the tub/shower, as the current vent needs to be removed. Vent is 1.5" vertically thru the roof. Water closet and Lav are vented seperately. So how can I connect this under the subfloor, and run up the rim joist vertically, then run a horizontal above the flood rim of the tub, and back to the existing vent. Space/height is limited under the floor, so looking for advice please! Thanks,
Vent Help!
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John Gayewski
In the Trades
If you draw a piping layout it'll be easier. A 2"pipe can go 8 feet without a vent. 1.5"pipe can go 6 feet. You just need to connect onto the lav/toilet drain and not go over those distances.
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Very rough (bad) drawing! Second photo is current state of project (recessed floor, and replaced rotten subfloor). ABS vent pipe still in the wall if needed... WC is 3", with a vent/lav downstream (this is my problem) 15". Then from the WC to tub, I have 6.5', and from the tub to shower, 5.5'. WC to Shower is 9' approximately.
Original bathroom had WC/lav on 3" drain/vent. Shower on 2" drain, tub 1.5 to 2", sharing 1.5" drain up through floor into knee wall, and out... I have already recessed the floor for a 36x48" curbless shower, and will have a freestanding tub. I have a window in front of the tub.
My question/uncertainly lies in trying to wet vent this bathroom group... seems to me that that lav dumping 15" downstream of the WC prevents me from venting the tub/shower?
Original bathroom had WC/lav on 3" drain/vent. Shower on 2" drain, tub 1.5 to 2", sharing 1.5" drain up through floor into knee wall, and out... I have already recessed the floor for a 36x48" curbless shower, and will have a freestanding tub. I have a window in front of the tub.
My question/uncertainly lies in trying to wet vent this bathroom group... seems to me that that lav dumping 15" downstream of the WC prevents me from venting the tub/shower?
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John Gayewski
In the Trades
You may have to reroute your 3"pipe since you have very little height to deal with. Basically between your toilet and lav needs a 3x2 wye then that 2" pipe can run past the tub with a2x1.5" wye and short trap arm. Then for the shower the pipe should go over next to a wall where a wye can turn up (or 45 degrees up) for a vent with the drain coming from the bottom of the wye.
John Gayewski
In the Trades
I appreciate your help! So I have a dedicated 2" drain for the tub/shower that connects to the main stack 20' feet away. I just don't have a wall to run a vertical vent within 5' of the trap. I just need to find a way to run a vent to the tub/shower, but my space is limited along with height! Battery and tape roll will be the holes (I should have done the shower piping before putting subfloor back in). I think trying to get a wye/combo at a 45 and up thru the baseplate is my only option. The tub will be a bit more challenging, trying to avoid coming up under the window and thru jack/king studs. I know I am overthinking this... and just need to get it done so I can move on to the next step.
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John Gayewski
In the Trades
The check that the upc hasn't been ammended where you live. In Iowa where I live we go by the upc, but the iowa code ammended the trap arm lengths to match ipc. So a 2" trap only needs a vent at 8'and 1.5 inch vent can be 6' away from the vent. It helps.
MN code uses UPC, and table 1002.2 shows 42" for 1.5 pipe, and 60" for 2 inch pipe. I want to be able to run the vents to the back/exterior wall, but I just don't think I have the room. I also can't drill holes through TJI webbing within 12-18" depending on size, so that limits how close I can get the trap arm to the wall. So my options are to fudge the 45 degree vent requirement to get it to wall and up, or extend the 3" toilet drain, and wye off to a 2" line for the tub, and route the vent stack vertically from the wall, and up to the attic. Then use the existing 2" drain line that the tub/shower were using, and move it over 1 joist, and run the vent vertically up the shower/bedroom wall, and into the attic.
