I realize that someone here is going to say hire a professional, but unfortunately that is not an option at this time, but the job still need to get done. So I would appreciate any help with this from anyone that is familiar with the code.

I'm installing a basement bathroom. There is one currently roughed in, but it is in a location that is just not practical and it would only service a sink / toilet. I need to have a bath tub / shower as well so I had to move it.

I've drawn up the existing layout (drains-existing.jpg). The stack on the left side has a toilet straight above and there is a vent that is going out as well which goes upstairs and into the roof. I will be tying my vents into that one (for anything that you see as vents on my drawing).

I need to know if this would be according to Ontairo building code. I think it would work, but I want to be sure before I change/install any new pipes. The concrete is already broken and trenches dug. I'm basically ready to install the drain pipes.

I did the best I could to draw it in photoshop. The existing plumbing has a Y (wye) fitting that connects the floor drain and the waste stack and then goes out to tap into the sewer line I guess. I basically just want to change the wye fitting to a double 45 wye fitting thereby giving me a third branch off to the right which will handle the toilet and bath tub (the red lines show where I would vent it -- I assumed that because it is within 10 feet that it would be okay to vent both the tub and the toilet).

The middle branch for the wye adapter would go to drain the sink which I would vent with a tee adapter (vertically).

I would then cap off the floor drain line that is there now and fill it with concrete. Instead I would install a new floor drain to the left of the wall (green line) which will be a small hallway.

My thought process on moving the floor drain is because the water heater (and furnace) will be behind the bathroom (above where the text is). So, if the water heater went or something, then the water "should" go around the bathroom and eventually go into the floor drain. For that I would put a new Wye fitting into the line that is already there between the waste stack on the left and the double wye fitting.

I would really appreciate any helpful comments!

Thanks in advance.

 

I don't see any issues with your basic plan. I'm familiar with US codes, but unfortunately less so Canadian codes, so there may be some differences and you may want to double check with someone who knows them better (I don't know that we have any Canadian plumbing code experts on this forum unfortunately).

Some notes (again, based on US plumbing code):
* While the tub drain need only be 1.5" PVC, I'm assuming you're using 2" as the toilet vent. So good job with the 2" bath drain and 2" bath vent.

* The vents will need to be tied together and go up above the highest fixture before tying into the main stack. You can't use the main waste stack as a vent as there are fixtures above, and that would create a wet vent which is no longer allowed.

* I agree with moving the floor drain. As long as you've broken up concrete, might as well put it where you want it.

 

Thank you for the response. Yes, I was planning on using the tub vent as the toilet vent, which is why I put it further down the tub drain line. According to the Ontario Building code website I found, it needs to be within 10ft for a toilet (3" drain) and within I think 5ft for a 2" line (shower). So by putting the vent down the tub line, then it will be within 10ft (approximately 7ft for the toilet) and approximately 4ft for the tub.

My plan for the venting was to go out the side of the tub into the wall cavity up the wall, and through the studs above the door header, across the ceiling and then tap into another vent (1.5 ") which goes up and out the roof. It is the vent for a toilet that is on the main floor actually.

Ontario Code (according to the website I found) does allow for wet vents and will even allow for cheater vents (but only in particular situations when venting is not practical). That said, apparently the municipality determines what is allowed, not JUST the province.

That all said, if it looks like it would work then I'll start cutting and gluing. That's my main concern.

 

OK. I've now installed the pipes as previously proposed. The only thing that i haven't glued is the P-Trap because I don't know if it is okay if I use a P-Trap that can be screwed together underground?? Any ideas? Or, do I have to make my own p-trap with glue??

The other picture is of a Double Wye connection. The left branch is from a toilet upstairs, the right branch the toilet in the basement and the middle branch is going to the sink with a T-Vent.

Will this be OK?

Area: Ontario, Canada

 

I'm a little worried that the Multiple Connection Fitting might clog (the Double Wye).

Is this a legal fitting on a horizontal drain with two toiled (one on left and one on right)?

 

In case anyone here is wondering in the future. I just spoke with a master plumber and he confirmed my suspicion. You cannot legally use a double Y fitting in a horizontal installation (in the floor) as I have. In addition, you cannot use the P-Trap as I thought as well. You must use a glued P-Trap instead of the kind that screw together.

 

Agreed with the need for a glued P-trap. I didn't know that a double wye was not allowed - sorry, but glad you got the answer you needed!