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Old 03-13-2010, 09:24 AM   #1
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where to put loop vent


it was designed that the bathroom double vanity drain has loop vent, to be hidden behind the wall where the vanity would be. turned out the wall is rigwht on top of a thick supporting beam, so the drain cannot go in that wall.

what should i do now? how do i place the loop vent? in another wall that is kinda far or what..??

thanks

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Old 03-13-2010, 11:04 AM   #2
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where to put loop vent


You can not use a loop vent for anything other than a kitchen or island sink. So do the drop through the floor with an AAV and a san tee. Another option would be to oversize the horizontal branch and go with a stack vent. IE bring 2 or 3" up into the vanity depending on the length of the run.

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Old 03-13-2010, 11:06 AM   #3
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where to put loop vent


I'm confused why you would put a loop vent on the bathroom vanity as well. Perhaps you're using the incorrect terminoligy?
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Old 03-13-2010, 12:11 PM   #4
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where to put loop vent


well, the logic was: the vanity drain is 7" off the stack, so i need to add 2ndary venting thus loop venting. can i not do it?

also, Why is avv better than loop? thanks

NHMASTER: what is a "san tee"?
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Old 03-13-2010, 09:50 PM   #5
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where to put loop vent


I'm having a real hard time picturing this.

Typically a loop vent is used on a kitchen island where there is no wall for the vent to travel through. It 'loops' back through the floor under the cabinet and travels to the nearest full wall, and also ties into the drain below.

Is this what you're referring to?
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Old 03-14-2010, 07:19 AM   #6
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where to put loop vent


a loop vent is any vent that loops back to the same stack it branches from. what nhmaster was refering to was a "sanitary tee" drainage term meaning that the branch is directional flow (sweeps in) do what nhmaster said install aav and call it a day
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Old 03-14-2010, 06:46 PM   #7
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where to put loop vent


i learned of "loop vent" from this link

http://www.rd.com/17755/article17755.html

i realized after relooking that I did understand it wrong. loop vent does not need to go into the wall.

Now my question is: is there a max no. of AAV that is allowed in the plumbing sytem? my project now is 1.5 bath w/a kitchen sink.
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Old 03-14-2010, 08:52 PM   #8
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where to put loop vent


Quote:
Originally Posted by hohadcr View Post
Now my question is: is there a max no. of AAV that is allowed in the plumbing sytem? my project now is 1.5 bath w/a kitchen sink.
Depends on local regulations. They are not allowed here.
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Old 03-14-2010, 09:40 PM   #9
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where to put loop vent


Quote:
Originally Posted by Alan View Post
I'm having a real hard time picturing this.

Typically a loop vent is used on a kitchen island where there is no wall for the vent to travel through. It 'loops' back through the floor under the cabinet and travels to the nearest full wall, and also ties into the drain below.

Is this what you're referring to?
thats basically what i would call a loop or island vent also.
what he is referring to in his origional post i would just call a revent ,which should be fine if we're talking about the same thing

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