venting a corner tub

[Brian Brown]

Hi All:

I'm remodeling a bathroom, raising a new wood floor over an existing slab to give me more altitude to work with to add several new fixtures over what was there before. I've pulled a permit, but did not want to annoy the inspector with what should be an obvious question... HOW to vent the corner tub?

I'm attaching a sketch and a photo showing my dry-fit fittings so far. Venting the lav, shower, and stackable washer/dryer is shown. My conundrum is how to vent the tub without a flat vent (under the plywood), since there are no walls nearby to bring-up a 1.5" vent. Because the main 2" drain drops down before tying-into the existing 3" drain, I don't think that the code would allow this long trap arm without a vent (even if I up-size the tub to a 2" drain).

Our code here is 2009 I.P.C.

Thanks a bunch!

 

[hj]

Your washer drains past the shower connection so the shower NEEDS its own vent, and it would be interesting to see HOW you have the trap arranged if it sits on top of the lateral line. I would use a 2" drain even WITH the proper vent. AND the tub needs one for the same reason. That looks like a pretty elaborate bathroom to be Mickey Moused on a platform.

 

[Sponsor]

 

[Terry]

If you run the tub line off of the lav line it would be vented.

Your washer drains past the shower connection so the shower NEEDS its own vent, and it would be interesting to see HOW you have the trap arranged if it sits on top of the lateral line. I would use a 2" drain even WITH the proper vent. AND the tub needs one for the same reason. That looks like a pretty elaborate bathroom to be Mickey Moused on a platform.

Good catch on the washer there.
That would do a good job siphoning the tub and the shower alright.

 

[Brian Brown]

If you run the tub line off of the lav line it would be vented.


Good catch on the washer there.
That would do a good job siphoning the tub and the shower alright.

Good catch indeed! Attached is a revised sketch with the tub draining into the lav line, all 2" plumbing.

The shower base will be a custom tile unit that I'll build, so I'll put the drain and trap off-line of the drain line.

Does this design seem more copasetic?

Thank you!!

 

[hj]

The horizontal vents, under the floor, for the tub and shower are no-nos.

 

[Brian Brown]

OK, "back to the drawing board..." I was able to find a reference copy of the 2009 IPC at my local library, and this helps a lot. I also found it online. Now, interpreting the code is another matter altogether, though.

I also figured-out how to draw iso's, so that should help visualize the connections. (see below)

The following design has a combination waste vent section in order to avoid a horizontal vent for the tub. Section 912 of the IPC addresses this.... http://publicecodes.cyberregs.com/icod/ipc/2009/icod_ipc_2009_9_sec012.htm However, I might be hosed by the ability to only serve "floor drains, sinks, lavatories and drinking fountains." Am I combo waste venting the tub, the lav, or both?

Thanks!

 

[hj]

you have a 'wet vent'. A "combo waste and vent system" is a completely different "animal" which would never be used in a home, and usually only in warehouses and factories, which is why they specify the fixtures it can be used with. Do it EXACTLY like the drawing, using the proper fittings, which are not shown, and it will work properly.

 

[Brian Brown]

you have a 'wet vent'. A "combo waste and vent system" is a completely different "animal" which would never be used in a home, and usually only in warehouses and factories, which is why they specify the fixtures it can be used with. Do it EXACTLY like the drawing, using the proper fittings, which are not shown, and it will work properly.

Wonderful. Thanks so much for your time and expertise, HJ, I really appreciate it!