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Thread: Basement bathroom venting in Canada

  1. #1
    DIY Junior Member dodge1930's Avatar
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    Default Basement bathroom venting in Canada

    Adding bathroom in basement, existing first floor bathroom waste stack 3" comes down the wall and then 90 through the wall at 7" off the basement floor into the septic tank.

    Toilet will be 4 ' from this pipe.
    see attched photo.

    Because of the main stack exiting through the wall I will need to have the bathroom floor built up, I'm trying to keep the height of the floor at a minimum.

    Do I need to add venting to the toilet?

    thanks
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    Last edited by dodge1930; 06-29-2010 at 09:43 AM.

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    What you are attempting spells out "hack job". Put in a sewage basin and pump and keep the toilet on the floor where it belongs.
    If you can't manage that then at a minimum, put in a macerating toilet that will pump up and over to the existing line.

  3. #3
    DIY Junior Member dodge1930's Avatar
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    This is in a summer cottage, so I was trying to keep the cost down. The bathroom will be together with the laundry room so there will be a step up from the laundry area to the bathroom area, not the end of the world, and the basement ceiling is over 8 feet so no problem for head room.
    I will be maintaining the correct slopes for all pipes.
    Assuming then, that this was under the slab would the venting be correct?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Once a pipe becomes a drain, it cannot be used as a vent. So, to do this, at least to US codes, you'd need to run a vent upstairs above the flood plane of the fixtures above and tie into those vents. If it is easier, you could run a new vent all the way up to the roof, but it is not required as long as it is tied into the pipe when it IS a vent.

    To get the fall and then elbow to direct the toilet drain into your existing drain, the floor will need to be somewhere near a foot high. You'll be much better off putting in a sump and sewage ejector.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Quote Originally Posted by dodge1930 View Post
    Adding bathroom in basement, existing first floor bathroom waste stack 3" comes down the wall and then 90 through the wall at 7" off the basement floor into the septic tank.

    Toilet will be 4 ' from this pipe.
    see attched photo.

    Because of the main stack exiting through the wall I will need to have the bathroom floor built up, I'm trying to keep the height of the floor at a minimum.

    Do I need to add venting to the toilet?

    thanks
    What is coming down that 2" line that seems to be coming from upstairs?

    Also you'd need to tie the toilet in UPSTREAM of the 3" soil-or-waste stack going up to the 1st floor bathroom. If you managed to make a proper wet vent out of all of this stuff you could easily meet code requirements.

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    DIY Junior Member dodge1930's Avatar
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    The 2" will vent straight up and out of the roof, because the other vent for the upstairs bathroom is on the other side of the cottage.
    This shows the up stairs bathroom that ties into the 3" I was showing in the other picture, and this has it's own 2" vent going up through the roof. In this picture, the 3" will run through the floor joist , running under the shower location to the toilet, about 4' between shower and toilet, sink will be to the side of the toilet around 3-4 '
    Thanks for eveyones suggestions...
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    Last edited by dodge1930; 06-29-2010 at 07:24 PM.

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    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Quote Originally Posted by dodge1930 View Post
    The 2" will vent straight up and out of the roof, because the other vent for the upstairs bathroom is on the other side of the cottage.
    This shows the up stairs bathroom that ties into the 3" I was showing in the other picture, and this has it's own 2" vent going up through the roof. In this picture, the 3" will run through the floor joist , running under the shower location to the toilet, about 4' between shower and toilet, sink will be to the side of the toilet around 3-4 '
    Thanks for eveyones suggestions...
    So you're saying the 2" vent is nothing more then just a vent? Running from your basement straight up and out the roof?

    And that picture of your upstairs bathroom doesn't matter. The toilet downstairs still needs to tie in UPSTREAM of where the bathroom is tied into the drainage downstairs.

  8. #8
    DIY Junior Member dodge1930's Avatar
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    So if I understand correctly, I tie in my upstairs bathroom closet point to where the pipe leaves the house, then behind that the downstairs toilet. Referencing the first picture of this post, I'm swapping the first two wyes originally I had outside of house - upstairs bathroom - downsatrs toilet....... this will change too outside of house - downstairs toilet - upstairs bathroom

    Someone also suggested I use a 13L toilet downstairs to have more flow instead of a 4-6L one?

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