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Thread: venting shower

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  1. #1
    DIY Junior Member 69gtocv's Avatar
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    Default venting shower

    I'm trying to vent my shower and came up with this mock-up. This will be between the floor joists separating the first and second floors. The 3" straight waste line on the right is coming from the second floor bathroom group and is already vented. The shower will also be on the second floor but will drain into the 3" drain here. The 90 w/heel will then turn down vertically into a wet wall on the first floor. Two questions. I'm a little shy of joist depth to be able to stack that wye/1/8 vertical to accept the line from the shower p-trap. I would be ok to roll that wye as long as I don't go beyond 45 degrees correct? #2... am I really venting the shower If I take a vent off the top of that 90 w/heel and go up through the roof (I have a wall I can pass it through above there) or does the vent have to come off of the trap arm between the p-trap and where it connects to the existing drain shown (which will be miniscule in length plus be underneath the shower pan so I couldn't go vertical from there)?

    Thanks, Jeff
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  2. #2
    Plumber jimbo's Avatar
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    The heel 90 is not a fitting you can use for a vent. That needs to be a sanitary Tee. The shower is not vented, as shown.

  3. #3
    DIY Junior Member 69gtocv's Avatar
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    Quote Originally Posted by jimbo View Post
    The heel 90 is not a fitting you can use for a vent. That needs to be a sanitary Tee. The shower is not vented, as shown.
    Well, now I'm really confused. Here is a quote from Terry on another thread about the heel 90's

    " They only make the Santee bend in the lo-heel, which is what is always used for venting.
    It it was a shower or lav, it would have to be a santee bend going from horizontal to vertical. "

    Isn't that what I'm doing in my layout? I have a book showing some fittings. They call the fitting I have a "low-heel vent 90" and it's right next to a "waste t aka san t" What are the differences in the two and why call it a vent 90 if it can't be used as a vent? So, if I changed that fitting to a sanitary Tee, would the shower be vented? If not, what would be your solution? How about the other question on rolling that wye?

    Thanks for your help, Jeff

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    DIY Junior Member 69gtocv's Avatar
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    Quote Originally Posted by jimbo View Post
    The heel 90 is not a fitting you can use for a vent. That needs to be a sanitary Tee. The shower is not vented, as shown.
    Just wondering. Is it because I have that fitting laying flat in the picture that is causing the problem, because it will actually be standing up vertical, vent coming off the top, not the side, or does that still not count? I just didn't take the picture with it in it's correct vertical position.

  5. #5
    Plumber jimbo's Avatar
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    I understand it will be vertical....and I am open to correction if someone says they can be used like that.

  6. #6
    DIY Junior Member 69gtocv's Avatar
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    Bump HJ or Terry, any thoughts?

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    DIY Senior Member asktom's Avatar
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    The UPC would allow the LHO 1/4 for just the toilet, but the shower messes things up. You should put a 3X2 wye below the LHO with a 2" 1/8 looking up, then a 2 X1 1/2X 2 san tee. The shower drains into the side of the tee and an 1 1/2" vent goes up. Tie the vents together up higher, 42" above the floor would please the inspector. There are other ways to do it, but I can't suggest any without seeing the whole situation.
    Last edited by asktom; 08-28-2010 at 05:44 PM.

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