Rough-in plumbing on new home

Discussion in 'General Plumbing Help' started by WillD2, Sep 10, 2019 at 11:03 PM.

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  1. Sep 10, 2019 at 11:03 PM #1

    WillD2

    WillD2

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    Hello everyone and thank you for the help.

    We are building a home slowly over the next year or so while we live in an RV. In order to get a credit towards the cost to run power, we must have a slab and rough-in plumbing done before getting electricity. I have done plumbing work in the past and feel that I am capable...with a good plan. The plan is what I am reaching for help on. I would even pay for the design work if that is an option.

    Basically we've got a 1 story, 2 baths that are back-to-back, a kitchen and laundry room near each other as seen in the attached floor plan. Septic on one side and the well water on the other. We would like to use pex piping. I am unsure of what portions should be concreted into the slab or under, general layout efficiency, etc.

    Would anyone be available to design a layout for my rough-in plumbing? For hire even?

    Thank you so much for any help!
     

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  2. Sep 11, 2019 at 12:49 AM #2

    WillD2

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    Here is an updated drawing with the plumbing outside of the house as a neighbor suggested.
     

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  3. Sep 11, 2019 at 3:41 AM #3

    frodo

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  4. Sep 11, 2019 at 3:51 AM #4

    frodo

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  5. Sep 11, 2019 at 4:00 AM #5

    frodo

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  6. Sep 11, 2019 at 4:07 AM #6

    frodo

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    not needed
     

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    Last edited: Sep 12, 2019 at 7:17 AM
  7. Sep 11, 2019 at 4:21 AM #7

    frodo

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  8. Sep 11, 2019 at 3:18 PM #8

    frodo

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    The plumbing that is on your plan. is shown in the outer footer
    I moved it so that it is not in the footing

    these next images are isos of the different areas

    6''.png 7.png
     
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  9. Sep 11, 2019 at 7:49 PM #9

    Diehard

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    @frodo...What do you think about the fact that some of these new washing machines have flow rates much higher than the older units. Do you think a 3" line (@ 1/8" slope) for the buried drain line from the washing machine should be considered? Particularly since it is also picking up the kitchen.

    Here's an article for the OP in case he may not already be aware of it.
    https://www.pmmag.com/articles/85477-it-s-not-the-plumbing
     
  10. Sep 11, 2019 at 8:16 PM #10

    frodo

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    it would be better

    a 2'' can handle the kitchen, washing machine and that scullery sink with out a problem
    I do like the idea of up sizing it, would not hurt my feelings if the 3'' also went to the kitchen ink
     
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  11. Sep 11, 2019 at 10:59 PM #11

    frodo

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    OP
    If, you do use Diehards suggestion and run a 3'' line to he washing machine

    below the concrete, tun up with a 3'' 90. then install a 3x2 bushing in the 90.
    this way, the 2'' pipe will fit in a 2x4 wall...
    OR. change the 2x4 wall to a 2x6 wall
     
  12. Sep 11, 2019 at 11:20 PM #12

    WillD2

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    Wow, thank you so much for the replies frodo!!
    I am trying to digest this....but will have more questions, lol
     
  13. Sep 12, 2019 at 1:58 AM #13

    Diehard

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    :thumbsup:
    Yes...you could get away without the need to use 3" in the vertical.
    I was only referring to the buried horizontal line for the 3".
     
  14. Sep 12, 2019 at 6:18 AM #14

    breplum

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    The discharge rate issue only comes up with AAVs not conventionally vented laundry situations.
    In 45 years, I've never encountered any reported problems with normally vented 2" laundry, kitchen, bathroom groups.
     
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  15. Sep 12, 2019 at 7:28 AM #15

    frodo

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  16. Sep 14, 2019 at 12:09 AM #16

    WillD2

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    Thank you so much frodo!
    I have a new drawing of the basic horizontal structure. It's a combo of your suggestions and a friend in town. I realize my 4" pipes are overkill, but I wanted to make it simple and clog free. I dunno.

    What do you think of this layout?
     

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  17. Sep 14, 2019 at 3:46 AM #17

    WillD2

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    Could you check my logic here on these drawings? Any big no-nos? Thanks!!
     

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  18. Sep 14, 2019 at 5:36 AM #18

    frodo

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  19. Sep 14, 2019 at 6:05 AM #19

    WillD2

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  20. Sep 14, 2019 at 7:08 AM #20

    frodo

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    tub_block_out.png

    after the pour
    pull the box and dig the dirt out of the hole
    set tub. hook up drain
    push dirt back into hole/ 1'' from top
    cap it with non fiber tar

    keeps termites out
     

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