DWV layout new construction- will this work?

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Reach4

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The area I am talking about is up and a bit to the left of what you show in the second picture in #20. I think it is your laundry tub and your laundry standpipe.
 

wwhitney

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I simply cannot for the life of me grasp the wet vent scenario in option 1
In option 1A, suppose the 2" lav drain (starting at the lav san-tee, the lav trap arm would be 1-1/2") didn't go down to the 3" line just below it. Suppose instead the 2" lav drain entered the floor system and connected horizontally to the 2" tub drain, upstream of the wye where the tub drain joins the shower drain. And further suppose that said wye has its outlet size increased to 3". That would be a way to let the lav drain wet vent the tub, the shower, and the WC.

Do you see anything glaring wrong with option 2?
Presumably you mean 2A. Just Reach4's comment, which is in reference to the venting of the laundry sink and standpipe. The laundry sink is the upper fixture on the stack, so the stack can vent it. The standpipe needs its own dry vent taken off (via an upright combo) before it joins the stack, and that dry vent can connect to the stack, at least 6" above the flood rim of the two fixtures, which is called a revent.

Is it ok to wet vent my Tub and shower as long as the trap distance to the vent is within 5'?
In option 2A, the terminology is that the shower is dry vented, the tub is wet vented by the shower, the lav is dry vented, and the WC is wet vented by the lav.

The horizontal and vertical distance limits that apply to 2A, assuming a 2" tub trap (the waste and overflow can be 1-1/2"):

5' of pipe run and 2" maximum fall from the shower trap outlet to the upright combo where the shower dry vent comes off.
5' of pipe run and 2" maximum fall from the tub trap outlet to the wye where the tub trap arm joins the shower drain.
6' of pipe run, counting both vertical and horizontal sections, from the closet flange to the wye from the lav drain joins the WC fixture drain; no limit on fall.

Cheers, Wayne
 

Schibig87

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The area I am talking about is up and a bit to the left of what you show in the second picture in #20. I think it is your laundry tub and your laundry standpipe.

facepalm - My lack of knowledge shined here for sure. Thinking this is the preferred way from searching here?


washer_rough_b.jpg
 

Schibig87

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In option 1A, suppose the 2" lav drain (starting at the lav san-tee, the lav trap arm would be 1-1/2") didn't go down to the 3" line just below it. Suppose instead the 2" lav drain entered the floor system and connected horizontally to the 2" tub drain, upstream of the wye where the tub drain joins the shower drain. And further suppose that said wye has its outlet size increased to 3". That would be a way to let the lav drain wet vent the tub, the shower, and the WC.


Presumably you mean 2A. Just Reach4's comment, which is in reference to the venting of the laundry sink and standpipe. The laundry sink is the upper fixture on the stack, so the stack can vent it. The standpipe needs its own dry vent taken off (via an upright combo) before it joins the stack, and that dry vent can connect to the stack, at least 6" above the flood rim of the two fixtures, which is called a revent.


In option 2A, the terminology is that the shower is dry vented, the tub is wet vented by the shower, the lav is dry vented, and the WC is wet vented by the lav.

The horizontal and vertical distance limits that apply to 2A, assuming a 2" tub trap (the waste and overflow can be 1-1/2"):

5' of pipe run and 2" maximum fall from the shower trap outlet to the upright combo where the shower dry vent comes off.
5' of pipe run and 2" maximum fall from the tub trap outlet to the wye where the tub trap arm joins the shower drain.
6' of pipe run, counting both vertical and horizontal sections, from the closet flange to the wye from the lav drain joins the WC fixture drain; no limit on fall.

Cheers, Wayne
In option 1A, suppose the 2" lav drain (starting at the lav san-tee, the lav trap arm would be 1-1/2") didn't go down to the 3" line just below it. Suppose instead the 2" lav drain entered the floor system and connected horizontally to the 2" tub drain, upstream of the wye where the tub drain joins the shower drain. And further suppose that said wye has its outlet size increased to 3". That would be a way to let the lav drain wet vent the tub, the shower, and the WC.
Here is this attempt.
1727144517386.png

Presumably you mean 2A. Just Reach4's comment, which is in reference to the venting of the laundry sink and standpipe. The laundry sink is the upper fixture on the stack, so the stack can vent it. The standpipe needs its own dry vent taken off (via an upright combo) before it joins the stack, and that dry vent can connect to the stack, at least 6" above the flood rim of the two fixtures, which is called a revent.
I also posted this as a reply to Reach4's post thinking this will work?
1727144731352.png

In option 2A, the terminology is that the shower is dry vented, the tub is wet vented by the shower, the lav is dry vented, and the WC is wet vented by the lav.
Thank you for giving me the correct terminology, I can see where wording is HUGE in the scheme of things.
The horizontal and vertical distance limits that apply to 2A, assuming a 2" tub trap (the waste and overflow can be 1-1/2"):

5' of pipe run and 2" maximum fall from the shower trap outlet to the upright combo where the shower dry vent comes off.
5' of pipe run and 2" maximum fall from the tub trap outlet to the wye where the tub trap arm joins the shower drain.
6' of pipe run, counting both vertical and horizontal sections, from the closet flange to the wye from the lav drain joins the WC fixture drain; no limit on fall. perfect!!! I meet these after measuring and remeasuring.

I am such a visual person (dyslexia) and so very thankful you have continued on with me even when I run around in circles. Eventually I get it... even if incredibly slooow.
Best,
Patty
 
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