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Old 06-19-2013, 03:11 PM   #1
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bathroom plumbing plan review


This is my first plumbing project and I was wondering if I could get someone to review my plan in the picture below.

I'm building a new 12'x5' bathroom attached to an existing outbuilding. The outbuilding is built on a slab and the new bathroom would be as well. Due to grading it will be connecting to a sewage pump.

Obviously the hand drawing in the picture isn't to scale but it should be fairly apparent what I'm trying to do. The main waste line will run under the slab right down the middle of the room. The vents will run up the south wall where they'll combine and then exit on the roof.

Any thoughts, suggestions, warnings?
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Old 06-19-2013, 06:07 PM   #2
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Are you located in WA by any chance?
Just guessing by your name. If so, your layout will not pass code there.

You have flat vents underground which are frowned on. I also believe there are easier ways to pipe the toilet.
There are also easier ways to pipe the vents. You have more vents than whats needed.

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Old 06-19-2013, 06:10 PM   #3
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Are you located in WA by any chance?
Just guessing by your name. If so, your layout will not pass code there.

You have flat vents underground which are frowned on. I also believe there are easier ways to pipe the toilet.
There are also easier ways to pipe the vents. You have more vents than whats needed.
Could I get away with just the sink vent?
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Old 06-19-2013, 06:44 PM   #4
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Quote:
Originally Posted by TheEplumber View Post
Are you located in WA by any chance?
Just guessing by your name. If so, your layout will not pass code there.

You have flat vents underground which are frowned on. I also believe there are easier ways to pipe the toilet.
There are also easier ways to pipe the vents. You have more vents than whats needed.
Or maybe add a vent outside before the sewage pump instead of the shower and toilet vents? I really have no idea on what/how many vents I need.
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Old 06-19-2013, 07:02 PM   #5
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Not legal under international code. What plumbing code is used by your state?
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Old 06-19-2013, 07:56 PM   #6
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if your under the IPC you can pipe it all in with just one vent on the branch,. less the pump pit, need fixture placement measurements to confirm. depending on the distances will determine venting.
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Old 06-20-2013, 12:54 PM   #7
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The top drawing is to scale. Shower starts 2' from left wall, sink 5' after that, toilet about 3.5' after that.

Everyone has told me what I shouldn't do, can anyone help enlighten me on what I *should* do?
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Old 06-20-2013, 01:01 PM   #8
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Quote:
Originally Posted by Ghostmaker
Not legal under international code. What plumbing code is used by your state?
Can you answer this question? Then we will tell you what you need to pass your inspection
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Old 06-20-2013, 01:07 PM   #9
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Best I can tell:

WASHINGTON STATE BUILDING CODE
CHAPTERS 51-56 and 51-57 WAC
UNIFORM PLUMBING CODE and
UNIFORM PLUMBING CODE STANDARDS 2006 Edition
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Old 06-20-2013, 01:17 PM   #10
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Quote:
Originally Posted by KingCrabLegs
Best I can tell:

WASHINGTON STATE BUILDING CODE
CHAPTERS 51-56 and 51-57 WAC
UNIFORM PLUMBING CODE and
UNIFORM PLUMBING CODE STANDARDS 2006 Edition
Ah, so you are in WA. I'll give you some ideas later, I'm at work now using my phone
But for starters you can wet vent the lav off the toilet or shower. That will save you some fittings and time.
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Old 06-20-2013, 02:32 PM   #11
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Ah, so you are in WA. I'll give you some ideas later, I'm at work now using my phone
But for starters you can wet vent the lav off the toilet or shower. That will save you some fittings and time.
Thank you, I truly appreciate it - no rush, I can wait until later!

So are you saying that I could have a vent off the main waste line after where the toilet joins in? Would that be in addition to the sink vent or instead of?

Someone mentioned above that I might not be able to vent off the main waste line since it's underground (under a concrete slab)??
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Old 06-20-2013, 04:32 PM   #12
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This will pass your inspection per UPC- there are other ways to pipe it as well but a single vent on the building sub drain will do it.
You will need roughly 15" below finish floor to do this layout- the fittings at the toilet will determine the depth(flange, 2-90's and a santee)- set your basin accordingly. Don't forget a 2" vent on the basin
Good luck!
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Old 06-20-2013, 05:02 PM   #13
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Thanks - I really appreciate it, and oddly enough, completely understand your solution!
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Old 06-20-2013, 07:27 PM   #14
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Thanks Eplumber I was sort of holding off for that code requirement. It looks like the UPC is sort of like are pre 1982 Ohio plumbing code. Now we use the infamous handy man code called international code...
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Old 06-20-2013, 07:37 PM   #15
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Upc venting is limited mainly to vert. wet vent, individual vents or engineer approved combination venting- such as in line of case drains in a grocery store.

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