Bathroom remodel, tentative plumbing layout

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1mgEpi

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Hi,

I wanted to run my tentative layout by some more knowledgeable people.
We are doing a bathroom remodel and relocating the toilet, adding a second sink, and changing what used to be a large corner tub for a shower.

Here's what I have so far:
plumbing layout.png

Green is 3 inch, blue is 2 inch and yellow is 1.5 inch.
The three vents are already in place, so I'm working with/around those. The one above the sinks is currently 1.5 inches, which I will up-size to 2 inches as it is wet venting the new toilet + two sinks.
The 3 inch run from the toilet on left to the main drain was previously 2 inch (there was a shower where my new toilet will be located).
There is a steel beam supporting the house on the top-left of the main drain (hence why the toilet/sinks drain connect at a lower point).

My main questions are:
1- Overall, does this make sense? Anything that jumps to your eyes?
2- Are the number of turns (currently 3x 90 degrees) from toilet to main drain too much? Will that cause problems?
Instead of doing a vertical drop and then back to horizontal, I could do a 45 degree angle maybe? (As mentioned above I cannot tie into the main drain on the same horizontal plan as there is a beam in the way.)
3- Am I fine to cap where the old toilet flange was located? The 3 inch vent remains hooked to the drain.

Thank you very much!
Nick
 

Terry

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I think in Canada, the 1.5" vent above the lavs is good enough for the toilet too.
The wet portion I would do in 2".
Make sure the vent for the shower comes off the top, normally a santee for that.
 

1mgEpi

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Hi Terry,
Thank you for your advice!
Taking those into account, here's what I have:

plumbing2.png


Is there anything else I can improve?
Thanks!
 
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wwhitney

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The vent for the shower needs to rise vertically (at least 45 above level) to at least 6" above the shower flood rim before it can turn horizontal.

Cheers, Wayne
 

1mgEpi

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Hi Wayne, thanks for the input!

Would this be an acceptable solution?
20220429_191852.jpg

In my situation the vent, the shower drain, and the main drain are all offset from each other in both X and Y.

Oh! And there will be a trap under the shower drain, forgot to draw that in.

Thanks!
Nick
 

wwhitney

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Yes, as long as the trap arm (from trap to san-tee under the vent) falls no more than one pipe diameter (2") but at least 1/4" per foot.

Also, on your 3" WC drain line, where it has to drop and turn 90 degrees in plan, if you have the clearance, the upper 90 (which can be a quarter bend) can be rolled 45 degrees so that your lower 90 (which would need to be LT90) can be replaced with a 45.

Or your upper 90 can be replaced with a 45, and the lower LT90 can be rolled 45 degrees.

Cheers, Wayne
 

1mgEpi

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Okay! Yes I'm pretty sure I can manage to change the drop and 90 turn to a 45 degree slope by doing what you suggested. That connection to the main drain would be lower down and I'd have to open up more wall, but I can manage that if it's for a good cause.
From what I read, doing a slope that is more than 1/4 inch per foot but less than 45 (let's say 22.5) is not recommended, correct?
 

wwhitney

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Are you talking about putting a 22.5 after the dual lav to start a gradual drop to get under the beam, and then a LT90 go back to 1/4" per foot with a 90 degree turn in plan?

Not sure if the 22.5 would be good, bad, or neutral. Maybe someone else will comment. Using a 45 and then a LT90 would be fine and I think a little better than two 90s, not sure.

Cheers, Wayne
 

1mgEpi

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Here's what I was thinking for my unconventional slope:
20220429_202056.jpg

I have read things about liquids outrunning solids, and then read that it's old wives tales. So I'm perplexed. Erring on the "safe" side I would probably do a 45 slope then.
Nick
 
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