Shower Drain distance from stack

I'm installing a new shower and plumbing. The main stack is 13' away. Can I use an arm using 2" ABS that long?

Is it "just against the code" or will it be a "recipe for disaster"?


THANKS!


__ pete

How far is the vent from the trap? Are you using the stack as the vent? Is there any part of the stack below the point where you want to attatch the shower drain line, that is a vent?

drain

Using the little information you have given, it is both against the code and a recipe for disaster.

Thanks guys...

The shower trap is 13' from the main stack. The stack is 3" and goes from basement to roof. Once the 2" pipe from the shower hits the main stack, nothing is below that, just the output to the city.

The house framing is complete. The stack is complete. The shower is almost complet. Now the drain. I was pretty sure 13' is a long way but, being in 2" and it's just a shower, I thought "it should work"

That said, the shower will be tiled completely so any modifications need to be now or never. Ideally, I assume I should run a vent beyond the shower trap going up to the main stack. BUT, the main stack is located on the other side of a very big wooden beam which I absolutely cannot put a hole through.

Here in Canada they "tolerate" air admittance valves (the good kind $$$) so, maybe my best bet would be to locate one of those above the shower somewhere ( I'll plaster over it but will install a clean looking access cover)

again thanks,

_ peter

Sealed in a closed wall cavity?

hi Peter!

is air going to get to the AAV? Or is it going to be sealed in a wall cavity?

is there any way to route a vent around the big beam, through another channel?

david

Hi Dave....

Well, I can get it to a very large cavity above the shower. I'll have to live with some kind of access panel too.

I'm also thinking on the lines of increasing the drain diameter to 3". I can pretty much go from the main stack to the shower with 3" ABS. At that point I'll reduce, install the trap, and then connect the Kerdi drain. If I go this route I would forget using an AAV.

Any thoughts?

_ pete

Yopu have no problem going 13' with your drain as long as you can get the slope. 1/4" per foot is required so you need a 3 1/4" drop.
Canada has not yet allowed AAVs. We expected to see something in the latest code release but there is no allowance. Your 2" drain and trap requires an 1 1/2" vent taken off it beyond 18" and closer than 5' from the trap. This must be tied into an existing vent at a point that is higher than the flood level rim of the highest fixture for that floor.
Are you just installing a shower, or a complete washroom?

3" with less slope

Pete

FYI: A drop of less than 3" will mean you just barely squeek by in terms of raw physics, with a 3" I.D pipe. Not recommended but good to know. Air has to go back up the pipe as water is coming down it, and a full pipe could block all air flow when the drop is more than the I.D.

I'd like to come over and see this project. You've been at it for a while. I'll show you mine too.

David

Thanks Dave...

You'd be amazed! it's been 2 years and I'm still at it. The house is a 100 years old and I'm completely remodeling it. Nothing would please me more than to chat a bit and maybe have you come over, your certainly welcome!

please, get in touch... peterb2001 is my nick at "Hot" you know where.


_ peter

Gencon..
Thanks!

I'm installing a steamshower, toilet and bidet. No bath tub or sink. My biggest problem is going 18" beyond and back up to the stack :-(

I'm still think'n 'bout all this so someday it should work O.K.


_ pete

drain needs air. 3" or 2" regardless

Peter

i just re-read the post where you said you considered using 3" and No vent... that won't work, you still need air and lots of it.

david

If yr framing's not complete, can't you just run a vent takeoff in the nearest wall cavity that the shower drain runs under? Run the vent up thru the wall and ceiling and connect to the main vent stack where ever it's convenient - even in the attic.

Why take chances with an AAV?