Shower Drain venting

homeguy34 · Mar 19, 2007

Hi everyone,

This is my first post, so if I miss anything let me know.
I was hoping for insight into a new shower drain. The main stack is approx 5ft away from the trap. Does this need vented? Or can I use the main stack as the vent.
It is a 2nd story bathroom. (2story house)

Second question, if this is too far without a vent, what distance is acceptable to use the main stack as the vent?

Thank you,
Alex

Geniescience · Mar 19, 2007

is the drain pipe diameter 2" ?

Sponsor · 2022-01-29T12:20:58-0800

homeguy34 · Mar 20, 2007

Yes, 2" diameter

Geniescience · Mar 20, 2007

other fixtures?

is this 2" pipe a branch arm -- with no other fixture connected? Or do you have another fixture connected before the 5' length goes into the stack?

david

homeguy34 · Mar 20, 2007

I don't have any other fixture connected to this drain line, the shower drain goes directly to the stack.

Will it matter if a toilet and sink are also connected to the 3" stack above or below where this line will go into the 3" stack?

Thank you for the help,, I really appreciate it.

Alex

Geniescience · Mar 20, 2007

2" pipe for 5' length is OK, AFAIK.

From a single 2" P trap and not more, a 5' length to the stack is OK, AFAIK.

homeguy34 said:
.... Will it matter if a toilet and sink are also connected to the 3" stack above or below where this line will go into the 3" stack?

no, the analysis stops at the stack, AFAIK.

David

homeguy34 · Mar 20, 2007

Thank you

Thanks David,

That helps me move along with the construction!! I appreciate it.

Alex

Markts30 · Mar 20, 2007

homeguy34 said:
Will it matter if a toilet and sink are also connected to the 3" stack above or below where this line will go into the 3" stack?
Alex

We are getting nto wet-venting here...
AFAIK
You cannot wet-vent a shower under a WC...
You can wet-vent a wc under a shower though...
There cannot be anything on any floors above going into the stack however...

mamato2girls · Mar 21, 2007

Mark,
I am confused by this being called wet-venting. Maybe I don't understand the layout. It is making me worry about my master bath in my new house. Not to hijack the thread, but can I run this by you? The room is a square with the walls being A, B, C & D going clockwise. On wall A is a jacuzzi tub, wall B is a sink, wall C has a toilet & shower. The vent stack runs over wall C. All four fixtures in the room are individually vented, coming out the top of the wall-plate, then they all intersect the 3" vent stack. The slope is right on all of them. I think the order they intersect from top of vent to bottom is jacuzzi, sink, shower, toilet. Does that make any sense?

Jadnashua · Mar 21, 2007

Sounds like your setup is normal. As I understand it, wet venting is relying on the use of a drain to vent a fixture - running the drain from one device to another with no vent line in between.

Each of your fixtures has its own vent line. They can be combined above the flood plane as long as the aggragate size is sufficient.

mamato2girls · Mar 21, 2007

Thanks!

Thanks so much for your help. I guess I misunderstood the previous posters description. I thought mine was pretty typical. Thanks!

Shower Drain venting

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