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Thread: When is a toilet vent not required?

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  1. #1
    DIY Member grahamW's Avatar
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    Default When is a toilet vent not required?

    Can anyone advise when a toilet vent isn't required in Ontario? I have a small 2 piece bathroom on the mainfloor and the toilet enters a 3" stack directly without a vent. The sink connects to this same stack and has a 1.5" vent.

    Thanks.

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    DIY Senior Member dlarrivee's Avatar
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    It does require a vent.

    The stack itself is likely 3" or 4", and I'm guessing nothing ties into it above your 2 piece bathroom?

    There are certain distances that must be adhered to, but the stack itself is venting the w/c for you here I imagine.

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    DIY Member grahamW's Avatar
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    Thanks for the quick reply dlarrivee! Indeed, the 'stack' is 3" and only contains the toilet with the one sink connection. It directly enters the main sewage line beneath the slab. I have yet to find the sink vent but I suspect it is 1.5".

    I was hoping for a 2" vent so I could tie in new basement drain and a laundry tub/drain. It looks like I'll be putting a 2" vent up to the attic after all.

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    DIY Senior Member dlarrivee's Avatar
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    Quote Originally Posted by grahamW View Post
    Thanks for the quick reply dlarrivee! Indeed, the 'stack' is 3" and only contains the toilet with the one sink connection. It directly enters the main sewage line beneath the slab. I have yet to find the sink vent but I suspect it is 1.5".

    I was hoping for a 2" vent so I could tie in new basement drain and a laundry tub/drain. It looks like I'll be putting a 2" vent up to the attic after all.
    You're better off trying to go straight up with your 2" vent than trying to tie into an existing horizontal one anyhow... you need to bore fairly large holes for 2" lines.

  5. #5
    DIY Member grahamW's Avatar
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    Quote Originally Posted by dlarrivee View Post
    You're better off trying to go straight up with your 2" vent than trying to tie into an existing horizontal one anyhow... you need to bore fairly large holes for 2" lines.
    Thanks, the problem is that it isn't a straight, vertical run to my attic. Will need one major jog as the roof level is split. Oh, and I hate distrubing all that blown insulation up there.

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    Certified Plumber Plumber1979's Avatar
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    more than likely your sink goes directly into the 3 inch stack. and you dont have to run 2 inch for a vent

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