Plumbing Layout Review

[dsanchez]

Hi There.
New to the forum but would appreciate some review and feedback on some plumbing I plan on doing shortly. I'm adding 2nd floor WC and moving an existing WC.

Just looking for some feedback regarding, if there are any issue with the set up, fittings used or code violations. Also any helpful 'gotchas' that you may know of that I should consider.

Also had a couple questions:
1. Started dry fitting some of the piping together and I'm concerned I won't get the proper slope (1/4" over 1') on the horizontal run in the 7.5 inch void. Any suggestions? Maybe I should be use floor flange with 3" inside fitting?

2. I have an existing bulk head in the kitchen on 2 sides. I'm hoping to match up the new bulk head on the same level but again I'm worried about the 90 and long sweep 90 causing the bulk head to be lower than the existing ones and not being able to tie the bulkheads together nicely. Any thoughts?

I've attached a side and over head view of drawings to illustrate the plumbing set up and fittings. The drawings aren't to scale and I'm not a drafter but hopefully these are good enough to get the idea.

Plumbing Diagram.pdf

FYI. I live in Ontario, Canada.

Thanks in advance for you feedback.

[dsanchez]

I guess because I'm new no one trusts the attachment??

Here's a jpeg of the diagram. Any expert opinions would be appreciated.



Thanks.

[SacCity]

Venting needs help.
Need a 2" vent for the toilet.
Also each toilet should be vented.
On the lower toilet vent needs to be before the wye where the lines tie in together.
The two vents can tie together 6" inches above the flood rim, but common practice is to tie together at 42" high.

[Tom Sawyer]

I don't think he needs 2" in Canada, 1-1/2 is ok I think. He needs to check his code though. IPC would let both toilets go without a vent as long as there was one somewhere in the house.

[dsanchez]

Thanks guys. Maybe i'll go with 2" just in case

[hj]

Flowing one toilet past the connection to a second one DOES need a vent, regardless of the required size, preferably at the point where the two meet, or else individual vents on each toilet line.

[Terry]

Flowing one toilet past the connection to a second one DOES need a vent, regardless of the required size, preferably at the point where the two meet, or else individual vents on each toilet line.

I looked at a similar situation in Seattle last week. One vent, two toilets, with one coming in horizontally on a wye after the first. One bowl works fine, but the other toilet loses water when the other toilet is flushed. Like hj, I think that you will need to make sure that each bowl is vented. With the new toilets that flush quicker, how they are plumbed is changing. The design after the water leaves the bowl is becoming "more" important, not "less".
With the Seattle home, older slow functioning bowls had been working. Changing to toilets with 3" flush valves changed that.

[dsanchez]

Thanks all. So will one vent after the wye work or are you saying I need to vent both toilets separately regardless?

[Terry]

I would future proof your home by venting each toilet "before" the wye.

In my own home, when I remodel the baths in the upstairs, I will be changing how the plumbing is routed for the toilets. The old ways no longer work.

[hj]

Either vent AT the "Y" so neither toilet can encounter a "pressure problem" or vent each separately.

[dsanchez]

Thanks for the advice, much appreciated.

One more question.. so if I run another vent at the wye where the toilets meet then I'll need to run the vent horizontally (slight slope) back to the shared wall of the toilet. it would be about 3' before the vent would travel vertically.

Any issues with this?

[Tom Sawyer]

Yep, You can't run a vent horizontal until it is 6" above the flood level rim of the highest fixtures served.

[hj]

Yes, because it is horizontal, but a "vent Y" between the closet bend and the toilet's "Y" would NOT be 3' from the wall.

[dsanchez]

Yes, because it is horizontal, but a "vent Y" between the closet bend and the toilet's "Y" would NOT be 3' from the wall.

Ok. But even if was right after the bend it would still need to run about a 16 - 18" horizontally back to the wall is this ok? If not how do I vent the second toilet?

[hj]

Roll the "Y" above the centerline as high as possible. IT will not "conform" to code, but will work.