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Replacing traditional vent with AAV

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  • Replacing traditional vent with AAV

    I know the general consensus about AAVs among plumbers is that they are bad, but I am still considering the use of one. I live in a newer mobile home and I am in the process of nocking down a few walls to make one large room out of two bedrooms, the respective closets and half of the bathroom that is between the two rooms (its a 5 bed, 3 bath and its just me and my wife). The bath is a full bath right now but will be turned into a half bath (tub removed). Right now the bathroom vent stack is behind the tub. I was going to cut off all water/sewer lines beneath the floor and cap them off. If I do away with the vent and put an AAV under the sink will I have any problems? Whats the draw back to doing this?

    I could reloacate the vent that is behind the tub over a foot or so and it would land in the new wall that is going up, but that would involve alot more sheetrock work and un-neccessary crap if an AAV will work.

    I just had another idea, although I think the AAV under the sink would be better. In the first pic you can see where the wall is staying (the small part with drywall still on it). I could run the vent pipe over to that wall under the subfloor and into that small wall. Then put an AAV in the wall. I know AAV's arent suppose to be in the wall, but local code here does allow for it if you put an access panel over it with a vent in it.
    Last edited by futuresweets10; 12-31-2010, 05:09 PM.

  • #2
    Re: Replacing traditional vent with AAV



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    • #3
      Re: Replacing traditional vent with AAV

      Are the other fixtures across the room from this vent in the pic? If they are check to see if they have their own vent and that they do not connect together in the attic. You may not need to do anything but go in the crawlspace and cap the line off.....maybe with a cleanout. You may not need that vent or an mechanical vent if your removing the tub .

      Oh and I won 450.00 at the Beau Rivage on monday.....The I.P's buffet sucked had fun tho. Goodluck with your project.

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      • #4
        Re: Replacing traditional vent with AAV

        Originally posted by TheMaster View Post
        Are the other fixtures across the room from this vent in the pic? If they are check to see if they have their own vent and that they do not connect together in the attic. You may not need to do anything but go in the crawlspace and cap the line off.....maybe with a cleanout. You may not need that vent or an mechanical vent if your removing the tub .

        Oh and I won 450.00 at the Beau Rivage on monday.....The I.P's buffet sucked had fun tho. Goodluck with your project.

        The other fixtures are across the bathroom from there, but I dont think the vent ties in above the ceiling. I have attached a pic of the bathroom layout below..... Do you live here, or were you just visting? I stayed at the Beau for the first time on the 23rd and had a blast (took the woman to the christmas musical thing they had there) at "coast". I prefer island view or treasure bay for gambling, but I guess its because Im a local.

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        • #5
          Re: Replacing traditional vent with AAV

          Originally posted by futuresweets10 View Post
          The other fixtures are across the bathroom from there, but I dont think the vent ties in above the ceiling. I have attached a pic of the bathroom layout below..... Do you live here, or were you just visting? I stayed at the Beau for the first time on the 23rd and had a blast (took the woman to the christmas musical thing they had there) at "coast". I prefer island view or treasure bay for gambling, but I guess its because Im a local.

          Looks like the lav and toielt are vented together. Check and see if you have a vent for that side of the rooms fixtures. You may can just fllow the tub drain to where it connects to the building drain and cap it.

          I go to the biloxi casinos and to harrahs over in new orleans somtimes.

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          • #6
            Re: Replacing traditional vent with AAV

            Originally posted by TheMaster View Post
            Looks like the lav and toielt are vented together. Check and see if you have a vent for that side of the rooms fixtures. You may can just fllow the tub drain to where it connects to the building drain and cap it.

            I go to the biloxi casinos and to harrahs over in new orleans somtimes.

            Just to confirm, there is only one pipe going through the roof in each bathroom and the pipe behind that tub has nothing T'd into it above the sheet rock.... Think I will add an AAV to be safe

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            • #7
              Re: Replacing traditional vent with AAV

              Originally posted by futuresweets10 View Post
              Just to confirm, there is only one pipe going through the roof in each bathroom and the pipe behind that tub has nothing T'd into it above the sheet rock.... Think I will add an AAV to be safe
              Then the lavatory was never vented properly unless it already has an aav. There is no way to vent the lavatory without an aav if the only vent is across the room.

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              • #8
                Re: Replacing traditional vent with AAV

                it's a mob. i seen them vented from the kitchen from the opposite end of mob. different rules and i don't know what they are. i will work on them cod. word to the wise. the interior walls act as braces. help hold the whole thing together. breid.............

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                • #9
                  Re: Replacing traditional vent with AAV

                  Originally posted by breid1903 View Post
                  it's a mob. i seen them vented from the kitchen from the opposite end of mob. different rules and i don't know what they are. i will work on them cod. word to the wise. the interior walls act as braces. help hold the whole thing together. breid.............
                  To an extent only.... I do alot of work on modular homes (while not hud homes they are constructed similar. On the inside of a mod/mobile there are no load bearing walls except for exterior walls (the marriage wall on a double wide too). You do have sheer walls, but its really easy to tell which walls are sheer walls and they are alot more rare in hud homes then in a modular home. The interior walls are do, in some cases help hold the exterior walls and such up and "brace" them as you said, but it is completely different than load bearing. I try to be careful about wich walls I take out and how I take them out. I took out a major wall shortly after buying the place about 5 years ago and it hasnt been a problem. The walls I am taking out now are basically the same thing, but in the other half (double wide). It is going to be the exact same length of room when done with the exception of the half bath, so this half of the trailer should be stronger than the other half.


                  BTW, thanks for the help guys and here is a pic of what it looks like now.
                  Last edited by futuresweets10; 12-31-2010, 11:03 PM.

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