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Thread: Proper Venting for a Shower Drain

  1. #1
    DIY Junior Member stilinsm's Avatar
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    Default Proper Venting for a Shower Drain

    Hey Guys,
    I'm in the middle of a bathroom remodel. Replacing a standard 30x60 tub with a shower, so I had to replace the 1.5" drain with 2". also had to reroute the vertical vent just a bit to accommodate a shower niche.
    Looking for some advise before I glue everything up..

    Is this venting proper or do I have it all wrong?

    The wye to the vent isn't horizontal. I've got it as vertical as possible so as to stay below the subfloor.

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    Last edited by Terry; 03-22-2011 at 09:46 PM.

  2. #2
    DIY Senior Member dlarrivee's Avatar
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    Doesn't look good to me... You're flat for 2 feet below the floor with your 1.5" before going vertical...

    Everything fits differently when you apply glue by the way, this type of pipe isn't meant to be dry-fitted, your pipe wont bottom out in the socket w/out glue.

  3. #3
    DIY Junior Member stilinsm's Avatar
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    Quote Originally Posted by dlarrivee View Post
    Doesn't look good to me... You're flat for 2 feet below the floor with your 1.5" before going vertical...

    Everything fits differently when you apply glue by the way, this type of pipe isn't meant to be dry-fitted, your pipe wont bottom out in the socket w/out glue.
    Ok, that's why I'm here. How should I vent this shower drain? The wye is rotated just enough so as not to go above floor joist level. The 2 feet of vent does have a little pitch to it.... admittedly not much.

  4. #4
    Test, Don't Guess! cacher_chick's Avatar
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    The vent cannot run under the floor. The wye for the vent must come up into a wall so that the vent is vertical.

    NO part of the vent can be run at less than a 45 degree angle until it reaches a level at least 6" above the flood rim of the highest fixture.
    Last edited by cacher_chick; 03-23-2011 at 08:23 PM.

  5. #5
    George the Plumber Gsalet's Avatar
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    I agree it is not the beest configuration but Uniform Plumbing code allows flat venting due to structural conditions, check your local building department. Is there any way to lower the 90 degree ell?

  6. #6
    DIY Junior Member stilinsm's Avatar
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    Hey thanks guys for some helpful advise ...

    Quote Originally Posted by Gsalet View Post
    I agree it is not the beest configuration but Uniform Plumbing code allows flat venting due to structural conditions, check your local building department. Is there any way to lower the 90 degree ell?
    The top plate of the lower wall is offset from the bottom plate of the bathroom wall, and the original 1.5" drain for the tub was vented vertical, so I'm guessing the structural condition rule was invoke when the house was inspected 12 yrs ago. This configuration adds another 6" or so to the horizontal vent. Both the vent and the wye are sloped downward toward the drain. The 90 ell can be dropped maybe another 1/2", but the p-trap is right there. Dropping it any lower would put the trap out of kilter.
    I will swap the two 90's in the wall for two 45's, eliminating that horizontal vent.

  7. #7
    DIY Senior Member dlarrivee's Avatar
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    Quote Originally Posted by stilinsm View Post
    I will swap the two 90's in the wall for two 45's, eliminating that horizontal vent.
    That isn't a big deal compared to what you have under the floor...

  8. #8
    DIY Senior Member jastori's Avatar
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    How about wet venting the shower with the lavatory drain? In our recent project, a 2" lav drain (properly vented) was used to wet vent both the toilet and shower. This was done by a licensed plumber, and passed inspection (hopefully it was correct).

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