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Old 10-09-2007, 02:06 PM   #1
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Please let me vent...


Hi all, long-time lurker, first-time poster. I searched for the answer but couldn't find it.

I'm adding plumbing to a detached garage bonus room, to which septic is already run. The venting for the toilet and bathroom sink are pretty much set. But I'm trying to figure out how to run the venting for bathtub and kitchenette sink. Should I just take each straight through the roof like this:


Or should I tie the sink into the tub like this:


Or should I tie it all back to the toilet vent like this:


Option 3 would be preferable since it would mean fewer roof breaches. Venting the sink to the 3" vent to the right isn't an option due to the way the ceiling is. Also, if I increase the toilet vent to 3", do I really need the 3" vent above the 4" line to the septic? Any other advice or comments would also be appreciated.

Thanks!
Vaughn


Last edited by SeaLawyer; 10-09-2007 at 02:11 PM.
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Old 10-09-2007, 03:14 PM   #2
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Please let me vent...


Have you considered using AAVs? Like THESE?

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Old 10-09-2007, 03:18 PM   #3
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Please let me vent...


These work pretty good, but I don't think they're to code everywhere... I pretty cure they're not where I live.
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Old 10-10-2007, 07:29 AM   #4
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Please let me vent...


The AAV's aren't encouraged for use in our area, but you can use them if needed. I added one to a sink that had right at 6 feet to the vent, rather than relying on it...it's a safe guard. I'd go with option 3.

At the stool on the right, I'd keep the 3" stack up into the attic, and tee in the sink on the left with the 1-1/2". I'd consider teeing a 3" to the shower, reduce to 2" from the shower to the sink. You could get buy with 2" all the way, but if you have the space, it's not worth the small amount of savings.

Above the stool on the left, where you tee-in step it up and exit the roof with 4". Our inspectors would like to see the stool on the right stepped to 4" as well. The inspectors say frost can build up and plug a 3"...not sure I agree...but it's not worth the fight.
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Old 10-10-2007, 09:00 AM   #5
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Please let me vent...


Quote:
Originally Posted by RippySkippy View Post
...I'd go with option 3.
Thanks for the input! I prefer option 3, but I didn't know if that would be too long to vent the right sink.

Quote:
Originally Posted by RippySkippy View Post
At the stool on the right, I'd keep the 3" stack up into the attic, and tee in the sink on the left with the 1-1/2".
I can't really get from the right sink to the 3" stack, based on the position of the sink, the wall, and the ceiling in that area. Is that what you meant? I COULD change that stack to a 4" without any trouble.

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Originally Posted by RippySkippy View Post
I'd consider teeing a 3" to the shower, reduce to 2" from the shower to the sink. You could get buy with 2" all the way, but if you have the space, it's not worth the small amount of savings.
It's a cathedral ceiling in the bathroom, so I'm running the vent through the rafters. It's a 2x8, so I'm ok up to a 2 3/8" hole. I really don't want to add a soffit because it would interfere with the window... So I think I'm stuck with 2".

Quote:
Originally Posted by RippySkippy View Post
Above the stool on the left, where you tee-in step it up and exit the roof with 4". Our inspectors would like to see the stool on the right stepped to 4" as well. The inspectors say frost can build up and plug a 3"...not sure I agree...but it's not worth the fight.
Well that's a good point. My plan called for a 2" vent from the toilet, and I just kept it a 2" for some reason at the tee above it. I'm pretty sure I can fit a 4" there - it's a 2x6 wall, but it might be tight at the roof. Once again, the darned cathedral ceiling is making my life more difficult.

Thanks for all the great comments folks! Keep 'em coming!
Vaughn
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Old 10-10-2007, 10:17 AM   #6
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Please let me vent...


I don't think you have to worry too much about distance at least somewhat based on the scale of your drawing.

Is your cathedral ceiling going to have a flat in the very top where you could run the vent up the slope of the ceiling and tie into a central vent stack that would run immediately below the peak? Something like the attached image... It might be better than trying to send a vent across several rafters which will not be fun. If you did this, I'm almost certain that you could get buy with one vent out the roof, but two would be better.
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Please let me vent...-ventingoption3a.jpg  

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