Plumbing Plan / Layout advice needed!

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Hwmfh

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Hi All

Glad to be here, and looking for some advice regarding a plumbing layout/plan.

A little backstory, we brought our house a few years ago pre covid. The bathroom had been gutted/back to studs by the previous owners, we purchased the house knowing that we would be taking on a bathroom reno at some point. After cleaning up/working on other areas of the house I'd love to get this bathroom done so my kids can have a bath and not just showers! Its a constant complaint in our house it seems!

The house is in CA and is on a slab foundation.

I'll need to dig up the slab to lay new plumbing so want to get it right before i make any cuts and would love to keep this thread or perhaps another updated with progress.

My suggested layout/plan is below. I guess my main questions would be. Would this work or am I over complicating it. Wasn't sure if i need the dry vents for the tub/shower or if this could be a wet vent off the sink?

bathroom.jpg
 

John Gayewski

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The pink vent for your toilet and shower aren't correct they would need to be vertical (45° minimum) while beneath the concrete. .

California is upc so for a horizontal wet vent your toilet needs to be the most downstream (first to drain into the branch).
 
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John Gayewski

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A horizontal wet vent for this would look something like this. But your trap arm lengths might be hard to achieve.

Screenshot_20220530-092916_Gallery.jpg
 

John Gayewski

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A conventionally vented system with one wet vent for the toilet via the lav would look something like this.


Screenshot_20220530-093748_Gallery.jpg
 

wwhitney

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In the last diagram you could also wet vent the tub via the shower and thereby have one less dry vent takeoff.

If the vanity and the WC were swapped, it would be possible to wet vet everything from the vanity without much trouble. As is, the vanity would have to cross over the WC and it would be tricky to comply with the 5' length limit on the shower and tub trap arms, and the 6' length limit on the WC fixture drain.

Cheers, Wayne
 

Hwmfh

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Wow, thanks for all the responses! So it seems that horizontal dry venting isn't a thing under slabs.

I think the vanity needs to stay put, its right next to the door and I'd rather that be the first thing you see as you enter rather than a toilet. The bathroom is pretty small so I might be able to make the horizonal wet venting work, however that being said it looks like i'll be aiming for something like the last picture. Per Wayne's comments if i can wet vent the bath from the shower that would look like so right?

1653971235223.png


I'll grab some shots of the room and try and update the thread as i go!
 

John Gayewski

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Wow, thanks for all the responses! So it seems that horizontal dry venting isn't a thing under slabs.

I think the vanity needs to stay put, its right next to the door and I'd rather that be the first thing you see as you enter rather than a toilet. The bathroom is pretty small so I might be able to make the horizonal wet venting work, however that being said it looks like i'll be aiming for something like the last picture. Per Wayne's comments if i can wet vent the bath from the shower that would look like so right?

View attachment 83917

I'll grab some shots of the room and try and update the thread as i go!
Yep that'll work
 

wwhitney

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Per Wayne's comments if i can wet vent the bath from the shower that would look like so right?
To wet vent the tub from the shower you need the vent to come off the shower trap arm before it joins the tub trap arm. [Or vice versa to wet vent the shower from the tub.]

Also if you want to pull a vent off a trap arm and keep the drain horizontal, you can do that with an upright combo. As opposed to a san-tee, where the drain turns down as you pull the vent off the top.

Cheers, Wayne
 

Hwmfh

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Once again thanks for all the replies, I got time today to get in the bathroom check out the current plumbing placement, and measure things out. I'm starting to lean towards the wet venting suggestion above due to 2 reasons.

1. The room is relatively small
2. There is already a vertical vent in position C from the previous Lav.

Based on CA code it seems the wet vent max length is 60 inches on a 2inch pipe, my understanding based on the suggestion above is that this section from the Lav to the tub (A to B) would need to be 60 inches or less correct?

1654495199826.png
 

wwhitney

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On the 60" limit for a 2" trap arm, for the tub (if you use a 2" trap), that would be the distance from the tub trap outlet to point B. The length of the wet vent itself, from B to A, is not limited.

The vertical vent at C, if it's a dry vent, you can't use it to vent the WC like that. Because you'd have a horizontal dry vent below the floor. If you dry vent a fixture (WC), then the dry vent has to come off vertical (at least 45 degrees above level) and stay vertical until at least 6" above the flood rim. When the lav was draining into the vertical, it was a wet vent, so those particular limits didn't apply.

The WC vent needs to be within 6' of the closet flange. So if the drain length from the flange (not shown) to that final wye to the left of B is under 6', you could wet vent the WC via the lav, just like the tub and shower. To do that the wet vent (drain) would need to be enlarged to 3" starting at point B.

Cheers, Wayne
 

Jeff H Young

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Having vent at "C" might or might not help , in any case you need a vent at the lav and it needs be minimum 2 inch if serving the W/C so the lav might likely be able to use the old vent if its 2 inch or greater
 
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