Getting ready to start laying out my under slab plumbing and just would like some verification on this layout. The green lines are 2" and the red lines are 3". The main thing I'm wondering is the distance from the vents. If you guys have some better suggestions, I would love to hear them. Im doing this house as an owner/builder. This will be in FL.
Would this meet code?
- Thread starter MadKaw284
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John Gayewski
In the Trades
You have some unnecessary pipe. But it's going to be easier for you to post one bathroom group at a time and ask for streamlining.
Under IPC, path from U of bath and shower traps to where the waste joins the 2 inch lav drainage must be no more than 8 ft.
Non-lavatory stuff needs dry vents. Dry vents must not be horizontal.
I appreciate it guys. I want to preface this by saying that i am not a plumber, I've come here looking for assistance from those that know more than I do about this.
I've attached a new screenshot of just "BATH 2". The way I currently have it layed out is the 3" branch line will go through to also be a cleanout. The lav will wye into the 3" branch with 2" and vent into the 6" wall. The toilet will be 3" with a 3x3x2 wye that will vent into the wall, and the shower will do the same but all 2". I was planning on connecting all 3 of these vent fixtures together into1.
are there any issues with this layout? I'm open to all criticisms. Thank you all in advance.
I've attached a new screenshot of just "BATH 2". The way I currently have it layed out is the 3" branch line will go through to also be a cleanout. The lav will wye into the 3" branch with 2" and vent into the 6" wall. The toilet will be 3" with a 3x3x2 wye that will vent into the wall, and the shower will do the same but all 2". I was planning on connecting all 3 of these vent fixtures together into1.
are there any issues with this layout? I'm open to all criticisms. Thank you all in advance.
Attachments
Bath 2.
1. Tub will need to be vented, but the vent must be vertical (within 45 degrees of plumb). To do that, run the tub trap output to the wall to be vented. Then run the 2-inch from the vent to join the toilet waste.
2. No separate vent needed for the toilet.
3. Lavatory will be dry vented in the wall.
1. Tub will need to be vented, but the vent must be vertical (within 45 degrees of plumb). To do that, run the tub trap output to the wall to be vented. Then run the 2-inch from the vent to join the toilet waste.
2. No separate vent needed for the toilet.
3. Lavatory will be dry vented in the wall.
I currently have the tub being vented by the wye going into the 6" wall, once the pipe goes under the wall, it will 90 up into the wall and tie into the lav vent. Is that acceptable?
Are you saying that I don't need to add a vent to the toilet? Will the vent on the lav be acceptable to vent the toilet?
Are you saying that I don't need to add a vent to the toilet? Will the vent on the lav be acceptable to vent the toilet?
No. The wye is not in the wall. I think you are saying that you will feed the vent to the wye away from the wall. That implies your vent to the wye is horizontal. Not allowed.
Instead vent the tub trap at the wall with a vertical vent.
1. Yes.
2. No; if the lav were upstream of the toilet, then it could wet vent the toilet. It is not, at least as you diagrammed it.
Oddly, if you routed the 2-inch lavatory drainage through the wall over to the tub, that line could vent the tub and the toilet. Alternatively the lavatory drain could be under the floor, go behind the toilet, and join the shower drain line. It could be the only vent. If this routing seems odd to you, then you probably understand what I am describing. You should maintain 1/4 inch per foot slope minimum for your 2 inch.
I think I understand what you are describing. So I should discard the lab drain altogether the way I have it layers out, and instead run the lab drain through the wall and over to the tub drain. With it set up like that, all these fixtures would be properly vented. Is that correct?
And also get rid of the toilet vent, because it would use the same vent as the lab and the tub.
Yes. After the vent point, the drain will be 2 inch. Bends that transition drainage from plumb to horizontal will be long sweeps, 45s, 22.5s, or wyes. Both tub and toilet will be wet vented.
There are various ways to combine the vent to the lav drainage. One is to use a sanitary tee. Another is to extend the trap arm horizontally, and vent in the wall to the right of the lav. Which way are you thinking of?
John Gayewski
In the Trades
I would run the bathroom group pipe under the 6" wall or behind it. That way you just turn one wye up for the toilet and one for the tub. The lav just comes off of the toilet. Vents need to be vertical so having the drain pipe under the wall let's you run vent piping in the wall vertically so you don't have horizontal portions of vent under the floor.
With the toilet in the middle you kind of need two vents unless you wanna pipe it in a round about way. Generally it's best to lay out a bathroom where the toilet drains first (the most downstream fixture) then the lav or tub/shower is upstream and everything is vented thru the lav vent. This isn't always practical and running vent pipe isn't usually that labor intensive, but this way usually allows an elegant simple and highly functional system.
With the toilet in the middle you kind of need two vents unless you wanna pipe it in a round about way. Generally it's best to lay out a bathroom where the toilet drains first (the most downstream fixture) then the lav or tub/shower is upstream and everything is vented thru the lav vent. This isn't always practical and running vent pipe isn't usually that labor intensive, but this way usually allows an elegant simple and highly functional system.
I sketched out three possible alternative routings. Use either purple, red, and for IPC, I think even blue works as long as the path out of the tub trap to joining the toilet waste is short enough! With a 1-1/2 inch trap, the developed length max would be 6 ft, but would increase to 8 ft if you used a 2-inch trap.
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Jeff H Young
In the Trades
no vent on the floor drain at water heater ?
Sorry for the delay, was helping my daughter move stuff out of her dorm yesterday.
So, for the purple line, do you have that as the lav sloping down through the wall and teeing into the tub with the vent going up through the wall? If so, will the purple line that is using a wye to come out of the tub drain be acceptable for a vent?
Can the water heater just drain outside similar to an ac condensate drain?
That works.
There is wide latitude where the vent line could connect to the horizontal in the wall, such as where the 6 is in the wall in your drawing.
The part downstream of the vent would be 2 inch, and could be 1.5 inch or 2 inch from the trap adapter and the wye+45 adding the vent. In IPC, instead of a wye+45, you could actually use a santee on its back.
Orange is 1.5 or 2 inch. Wye for venting is 2 inch out. Could be https://www.supplyhouse.com/Spears-P601-241-2-x-1-1-2-x-1-1-2-PVC-DWV-Wye or just 2x2x2 wye with bushings or santee.
This is one possibility. Another possibility is to have the venting at a santee that has the trap adapter come into the side port, and then go horizontal with a long sweep below the santee.
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