Need DIY advice on bathroom DWV layout

[DanFL]

I have a single story home on concrete slab in Central FL. To my knowledge we follow IPC here, unless a fellow Floridian can correct me on that. Referring to the attached diagram, I'm trying to add a bathroom and rearrange the laundry room.

#1: Is it allowed for the laundry drain trap arm to make a turn in the wall as shown with the proposed green line, as long as it is within the allowed 60" length? IPC allows a 1/4 bend horizontal-to-horizontal, which I think might be easier to fit into the corner of the 2x4 wall. Or do I have to bust up the slab and move the whole drain/vent to the other wall as shown by the dashed line?

#2: Can I connect the shower drain to that same existing 2" drain for the washer drain? I could keep the existing vent and just move the washer drain arm, regardless of answer to #1. Or is it better to tie that shower into the toilet drain? For various reasons, I believe it would be a bit easier to connect to the washer drain.

Any advice to pass inspection is appreciated. Questions on the toilet layout to follow...

 

[Terry]

I don't believe you can wet vent a shower with a washer, at least not with UPC.

 

[Sponsor]

 

[Reach4]

You cannot join the washer standpipe to a 2 inch pipe carrying anything else. You have to get that to a 3 inch pipe.

Your shower is not vented appropriately.

There are other problems.

Is there a bathroom sink?

 

[DanFL]

Thanks for the quick responses gents. So if I move the shower drain to the 3", am I allowed to bend the washer trap arm through the wall corner? Or should I just cut the slab and move it all? There will be a bathroom sink and laundry sink in garage. Updated diagram attached showing the proposed sink connections. Thanks again for the input.

 

[Reach4]

In the marked-up sketch, red is for the laundry tub and/or standpipe. See if others buy in to that. In IPC there is a way to have both share the same trap -- if you are interested. (http://media.iccsafe.org/news/icc-enews/2018v15n13/2018SC-IPC802.pdf) That joining of laundry waste with toilet stuff can be discussed.

Advantages include not interrupting the bathroom stuff with the laundry drainage. I am not sure that is necessary, but suspect it might be because wet venting is for bathroom stuff. Laundry is not bathroom. I am not a plumber.

 

[DanFL]

Sorry for the confusion, I should have called that a "utility sink" in the garage instead of "laundry sink". The laundry drain is still to the left in my second diagram, on the wall opposite the toilet/shower/sink drain. There is no room for the laundry sink in the actual laundry room, so it's going in the garage. So I have 2 separate things going on here: moving the laundry/washer drain to the new wall as shown in the first diagram, and then adding the bathroom group as shown in the second diagram. I'd still like to know if my proposed bathroom group is OK, and if the offset sinks connections to the wet vent are OK.

 

[Reach4]

utility sink" in the garage instead of "laundry sink".

Still, utility sink is not a bathroom sink. Comments on wet venting still apply. Join the utility sink drainage to the flows after the bathroom stuff. Give the utility sink a dry vent, or use an AAV. Want an easy way to vent the utility sink without joining the real vent, or mounting an AAV yourself? Take a look at the Rectorseal 97402 Magic Trap with the Rectorseal 97400 AAV.

https://rectorseal.com/product/magic-trap/