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Thread: WC venting alternatives

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  1. #1
    DIY Junior Member Earl001's Avatar
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    Default WC venting alternatives

    Tried a more difficult post in the general forum with no luck (http://www.terrylove.com/forums/show...for-sunken-tub). So I’ll try here with the second part of my venting question.

    Which of the following venting layouts for a WC is permitted/recommended? Plan B requires a much longer horizontal vent so is less preferable from an installation point of view.

    Plan A
    ……………………………f…………v…………………..
    ……………………………b………..ddddz……………
    ……………………………b………..……….z…………..
    ……………………………bbhhhhhhhhyyhhhhhhhh

    Or

    Plan B
    ………………………………….….v…………………
    ……………………………f……….ddddddddddv
    ……………………………b………..………………..v
    ……………………………bbhhhhhhhhhhhhcc
    ………………………………………………………….c

    Where
    f = WC flange
    b = 3" 90 deg vertical to horizontal
    h = 3" horizontal run sloped at 1/4 in/ft
    d = 2" horizontal (dry) vent sloped at 1/4 in/ft
    v = 2" vent vertical to roof
    c = 3" medium 90 deg horizontal to vertical with 2”
    y/z = 3"x3" Y fitting with 2" exit rotated ~60 deg rolled so that it is above the horizontal centerline of the drain connected to 2” 45 deg bend leading to a 2" horizontal dry vent

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Earl,
    In California, they use the UPC code,
    Here is a nice link to Bert Polk's plumbing tips

    Bert is a plumbing inspector for UPC.

  3. #3
    DIY Junior Member Earl001's Avatar
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    Terry,

    Thank you. The tips are quite informative! However, all his photos show the vent traveling vertical or what looks like 45 deg then vertical. He does not say anything about a flat vent. Perhaps the diagram below may help explain my dilemma. Due to space limitations I must run the 3" line along the joist line to the girder. Doing so makes a vertical vent impossible. Do you think this layout will cause problems? If the Y is a problem (it's not vertical but rotated 45 deg from horizontal), I think I could fit a combination long Y to the 2" flat vent instead. In this case I'd plan to rotate it from horizontal so it is as vertical as possible.
    Attached Images Attached Images  

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    Forum Admin, Expert Plumber Terry's Avatar
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    We are allowed to do what your last post shows.
    Wye turned above the flow line of the pipe, using waste fittings below the flood level of the fixture.

  5. #5
    DIY Junior Member Earl001's Avatar
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    Quote Originally Posted by Terry View Post
    We are allowed to do what your last post shows.
    Wye turned above the flow line of the pipe, using waste fittings below the flood level of the fixture.
    Great. Thank you so much Terry.

    Just so I can learn a little from this, it would be nice to know what "using waste fittings below the flood level of the fixture" means. Since I'd think the flood line for a toilet is at the rim wouldn't all fittings be below that? Or does this mean that the vent line must be dry (i.e not be a 'waste fitting' by being turned above the flow line of the pipe) since that does go above the rim.

    earl

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    Forum Admin, Expert Plumber Terry's Avatar
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    The flood lever of a toilet is the bowl.
    Most plumbers revent at 42" which is 6" above the flood level of the highest fixture, the kitchen sink.

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