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    freberd's Avatar
    freberd Posts: 11, Reputation: 1
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    #1

    Mar 1, 2007, 08:18 PM
    Need to plumb bathroom in concrete slab
    We are having a pole garage built in Washington state and we need to put sewer pipes in the ground before they pour the concrete slab. We want a bathroom (toilet, sink and shower) and on the other side of the wall a utility sink.

    What size pipe should we use? We are open to layout of fixtures any setup better than another? Can you vent outside wall then up? Is it OK not to have access to pea trap? Should we build a box around pipe or pour concrete around it?

    Any help you can give would be greatly appreciated
    Thanks!:p
    nmwirez's Avatar
    nmwirez Posts: 453, Reputation: 20
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    #2

    Mar 2, 2007, 08:23 AM
    Quote Originally Posted by freberd
    We are having a pole garage built in Washington state and we need to put sewer pipes in the ground before they pour the concrete slab. We want a bathroom (toilet, sink and shower) and on the other side of the wall a utility sink.

    What size pipe should we use? We are open to layout of fixtures any setup better than another? Can you vent outside wall then up? Is it ok not to have access to pea trap? should we build a box around pipe or pour concrete around it?

    Any help you can give would be greatly appreciated
    Thanks!:p
    Need more data. I take it the pole construction is rectangular for a one or two car garage with living above? Is the pole construction remaining open walls between poles at garage level? If so describe how the upper floor is going to be supported on the poles for subfloor and joist hanging. (i.e. belly band rim joist on outside or inside of poles)
    freberd's Avatar
    freberd Posts: 11, Reputation: 1
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    #3

    Mar 2, 2007, 12:21 PM
    The bathroom will be on the main floor. The garage will be 36 x30. Bathroom will be in far corner.

    Thanks!
    nmwirez's Avatar
    nmwirez Posts: 453, Reputation: 20
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    #4

    Mar 2, 2007, 01:47 PM
    Quote Originally Posted by freberd
    The bathroom will be on the main floor. The garage will be 36 x30. Bathroom will be in far corner.

    Thanks!
    Good, that is a start. May I suggest that to establish where the rough-in stub ups and vent stacks are going to be located, determine the wall line first. Then from there you can basically go into a residential bathroom to see where to place each fixture and where the rough-in stubs will be in your construction layout. (I.e. A toilet rough-in WC flange is 12 inches from the finished wall while the 2" vent stack will be centered in the wall on line with the flange. Gotta know where the framing walls are, outside the pole exterior or inside the pole interior, or centered between the poles. Define your framing first then do your plumbing slab rough install to the 3" DWV ABS drain pipes. Also do a pipe drawing takeoff for both materials cost and purchase. (or hire a plumber to do the rough.) It is advisable to keep the plumbing Drain Waste and Vent inside the structure walls as you would electrical wiring too. Have a good day.
    freberd's Avatar
    freberd Posts: 11, Reputation: 1
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    #5

    Mar 2, 2007, 03:00 PM
    Can you vent outside then up? So we don't have drill a hole in the roof it it is really high 14 ft walls
    nmwirez's Avatar
    nmwirez Posts: 453, Reputation: 20
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    #6

    Mar 2, 2007, 04:05 PM
    Quote Originally Posted by freberd
    Can you vent outside then up? so we dont have drill a hole in the roof it it is really high 14 ft walls
    Is this going to be inspected?
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    freberd Posts: 11, Reputation: 1
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    #7

    Mar 2, 2007, 04:23 PM
    Yes
    nmwirez's Avatar
    nmwirez Posts: 453, Reputation: 20
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    #8

    Mar 2, 2007, 04:29 PM
    Quote Originally Posted by freberd
    yes
    UPC may be adopted and require inwall vent to roof. Check local building department.
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