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Thread: Need review of a rough plumbing diagram

  1. #1
    Cleveland Guy ClevelandGuy's Avatar
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    Default Need review of a rough plumbing diagram

    Can someone review the attached rough plumbing diagram. Let me know if my pipe sizes are ok, and check my venting. I have no clue how to properly vent, especially with 2 bathroom sharing a wall. Any other suggestions would be great!

    This is for a single story ranch style cottage with a crawlspace with the main drain going horizontal to a septic tank.

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    Any help/advice is greatly appreciated

  2. #2
    Moderator & Master Plumber hj's Avatar
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    If you intend to acutally install it the way you have drawn it, you are going to a LOT of extra work and expense. But it would be difficult to explain a different way and hope that you would understand and install it that way. You do NOT want to run 3" laterally and the reduce it to 1 1/2" for the sinks. And I would not run 1 1/2" to the sinks in the first place. The same thing with the 4" reducing to 2" for the tubs.
    Licensed residential and commercial plumber

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    Cleveland Guy ClevelandGuy's Avatar
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    Your feedback is greatly appreciated. Could you suggest an easier way to layout this plumbing based on the constraints of the bathroom floor plan?

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    DIY Member timf's Avatar
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    And your vents on the toilets are wrong. They need to be downstream of the toilets rather than where you show them to protect the toilet traps from being siphoned.

    Tim

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    In the Trades Tom Sawyer's Avatar
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    Quote Originally Posted by timf View Post
    And your vents on the toilets are wrong. They need to be downstream of the toilets rather than where you show them to protect the toilet traps from being siphoned.

    Tim

    Toilet traps are designed to be siphoned and it makes no difference where the vents are except that that no part of the vent can be horizontal until it is 6" above the highest fixture served (the lav's)
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  6. #6
    DIY Member timf's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    Toilet traps are designed to be siphoned and it makes no difference where the vents are except that that no part of the vent can be horizontal until it is 6" above the highest fixture served (the lav's)
    I didn't realize that. Thank you for the correction.

  7. #7
    Moderator & Master Plumber hj's Avatar
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    The toilet vents are in a proper location, they are just connected horizontally.
    Licensed residential and commercial plumber

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    Certified Plumber Plumber1979's Avatar
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    technically you dont have to ven your toilets if you have both lavs coming off like you do. its called wet venting
    Last edited by Plumber1979; 07-15-2012 at 04:27 PM.

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    Certified Plumber Plumber1979's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    Toilet traps are designed to be siphoned and it makes no difference where the vents are except that that no part of the vent can be horizontal until it is 6" above the highest fixture served (the lav's)
    thats not right either

  10. #10
    In the Trades Tom Sawyer's Avatar
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    Quote Originally Posted by Plumber1979 View Post
    thats not right either

    Really? enlighten us please
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  11. #11
    In the Trades Tom Sawyer's Avatar
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    Quote Originally Posted by Plumber1979 View Post
    technically you dont have to ven your toilets if you have both lavs coming off like you do. its called wet venting
    Technically, he's in Oregon which is UPC so given the locations of the fixtures, he will have to individually vent the water closets. If Oregon was IPC then he could get rid of the toilet vents altogether.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  12. #12
    Moderator & Master Plumber hj's Avatar
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    The vent cannot be horizontal until it is 6" above the "overflow" level of THE fixture, not the highest one.
    Licensed residential and commercial plumber

  13. #13
    In the Trades Tom Sawyer's Avatar
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    No, that would be 6" above the flood level rim of the highest fixture served by the branch which in this case is the lav.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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