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Basement bathroom - finishing plumbing diagram/layout feedback request

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  • Oct 21st, 2020 5:13 am
[OP]
Newbie
Sep 13, 2013
91 posts
27 upvotes
Ottawa

Basement bathroom - finishing plumbing diagram/layout feedback request

Hi,

I am in the process to finish my half-finished basement, which came with a 3 piece bathroom rough-in. I would like to tackle to finish plumbing the diagram to code, and i came up with the attached diagram. I read OBC section 7 as well as other guides/tutorials to get an understanding on what is required to meet code, as i pulled a permit and it will be inspected.

The vanity will be 30" and the toilet has around 23" of clearance on both sides from the center. The shower will 60" x 32".

I would like to get some feedback on the below diagram on how i would pipe the 3 piece bathroom. Any help would be greatly appreciated.

Proposed piping diagram (please excuse my lack of photoshop skills):
  • pipe A - 3" used for the toilet
  • pipe B - 2" used as wet vent (my understanding)
  • pipe C - 1.5" shower drain
  • pipe D (top left corner) - vent
I will need to move the shower pipe (pipe C) as it is not in the correct location, so i plan on using a demolition hammer and moving the trap and leaving it open for the inspector.

Image
3 replies
Deal Fanatic
User avatar
Oct 15, 2007
5115 posts
2531 upvotes
eroci7 wrote: Hi,

I am in the process to finish my half-finished basement, which came with a 3 piece bathroom rough-in. I would like to tackle to finish plumbing the diagram to code, and i came up with the attached diagram. I read OBC section 7 as well as other guides/tutorials to get an understanding on what is required to meet code, as i pulled a permit and it will be inspected.

The vanity will be 30" and the toilet has around 23" of clearance on both sides from the center. The shower will 60" x 32".

I would like to get some feedback on the below diagram on how i would pipe the 3 piece bathroom. Any help would be greatly appreciated.

Proposed piping diagram (please excuse my lack of photoshop skills):
  • pipe A - 3" used for the toilet
  • pipe B - 2" used as wet vent (my understanding)
  • pipe C - 1.5" shower drain
  • pipe D (top left corner) - vent
I will need to move the shower pipe (pipe C) as it is not in the correct location, so i plan on using a demolition hammer and moving the trap and leaving it open for the inspector.

Image
What you’re showing is correct however you can run your trap arm for your sink straight from your 2” wet vent as you trap arm allowance for 11/2” is 72” . This will save you pipe and fittings and will be a more direct run. Also how many simultaneous head will your shower have? Anything other than 1 will require a 2” trap

Also just for your reference, In your drawn diagram the downstream section of the 11/2” tee wye (the lower portion into the 90 and across to the 2”) wouldn’t be classified as a trap arm. The trap arm would end at the tee wye. Downstream of the tee wye would be called the fixture drain

Also, a tip. You might want to add in some blocking for your shower glass or curtain before boarding
Everything has been said before, but since nobody listens we have to keep going back and beginning all over again. - Andre Gide
[OP]
Newbie
Sep 13, 2013
91 posts
27 upvotes
Ottawa
Red_Army wrote: What you’re showing is correct however you can run your trap arm for your sink straight from your 2” wet vent as you trap arm allowance for 11/2” is 72” . This will save you pipe and fittings and will be a more direct run. Also how many simultaneous head will your shower have? Anything other than 1 will require a 2” trap

Also just for your reference, In your drawn diagram the downstream section of the 11/2” tee wye (the lower portion into the 90 and across to the 2”) wouldn’t be classified as a trap arm. The trap arm would end at the tee wye. Downstream of the tee wye would be called the fixture drain

Also, a tip. You might want to add in some blocking for your shower glass or curtain before boarding
Hi Red Army,

Thank you for taking the time to review my plan and provide feedback - i appreciate your help.

Running the trap arm straight from the 2" wet vent to the sink will still require the first vertical dry vent pipe (to the left of the toilet pipe (pipe A)) except it would tie into the trap arm via a tee wye as it is tying into a horizontal run, and it wouldn't be a straight vertical rise, but rather at a slight angle, as the trap arm would be slopped, is my understanding correct?

The shower will only have 1 shower head and it will be at opposite of the drain due to the lower ceiling height caused by the bulkhead. I know it would look a bit awkward by convention, but the shower base has that hidden linear drain design, so i think it would actually work out nicely, especially as you won't be walking in/out over it.

Thanks for the tip! I will be adding blocking for the shower glass as well as for the towel holder.
Deal Fanatic
User avatar
Oct 15, 2007
5115 posts
2531 upvotes
eroci7 wrote: Hi Red Army,

Thank you for taking the time to review my plan and provide feedback - i appreciate your help.

Running the trap arm straight from the 2" wet vent to the sink will still require the first vertical dry vent pipe (to the left of the toilet pipe (pipe A)) except it would tie into the trap arm via a tee wye as it is tying into a horizontal run, and it wouldn't be a straight vertical rise, but rather at a slight angle, as the trap arm would be slopped, is my understanding correct?

The shower will only have 1 shower head and it will be at opposite of the drain due to the lower ceiling height caused by the bulkhead. I know it would look a bit awkward by convention, but the shower base has that hidden linear drain design, so i think it would actually work out nicely, especially as you won't be walking in/out over it.

Thanks for the tip! I will be adding blocking for the shower glass as well as for the towel holder.
Yes, you would only need to bring the vent to the top of the 2”x1-1/2”x1-1/2” tee wye. You don’t need to tie it in to the trap arm on the horizontal
Everything has been said before, but since nobody listens we have to keep going back and beginning all over again. - Andre Gide

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