Rerouting Main Stack / Toilet position

I'm expanding my upstairs bathroom and would like to push the wall where the main 3" stack is in over 16".

Please refer to the attachment to see what I'm trying to achieve.

Can I put the upstairs toilet in the position I've drawn (at the top of the sanitary tee)? Will it vent correctly?

So many things wrong with that layout.
Do they really plumb like that in Canada?

There aren't any codes in the lower 48 that will allow some of what I'm seeing on the drawing.
I'm not so worried about the toilet, but some of the other fixtures look like problems.

Yea, you can't do 90% of that, not even in Canada

Thanks for the useful info. By the way, the layout (except for the upper toilet) has worked for the past 50+ years in the house. What conerns do you have about the other fixtures?

There is a difference between the phrase

"Working for 50 years."
and
"In use for 50 years."

The way this is plumbed will siphon water from the traps.
Yes, the water will move it's way down the line, so will the water in the p-traps.
The home may smell a bit, but then after 50 years, you start thinking that's normal.

There is a difference between the phrase

"Working for 50 years."
and
"In use for 50 years."

The way this is plumbed will siphon water from the traps.
Yes, the water will move it's way down the line, so will the water in the p-traps.
The home may smell a bit, but then after 50 years, you start thinking that's normal.[/QUOTE]


Good point. Well, apparently way back then wet venting was all the rage in Canada.

Anyway, all of the that plumbing is in the slab.

Is there anyway of adjusting the above slab plumbing to improve the venting issues?

Would the following changes be sufficient?

You missed the downstairs vanity. And the toilet vent can connect to the laundry vent 42" above the floor, as long as the upstairs sink connects to the main riser.