Traps in Walls: "Can't" vs. "Shouldn't"

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by speede541, Mar 8, 2011.

  1. speede541

    speede541 Member

    May 1, 2010
    In my post regarding draining my boiler condensate a few posts down from this one ( ) I'm looking at stuffing a 1-1/2" ABS trap between the studs.

    Not so much for aesthetics, but for space conservation -- it's a cramped utility room and I need to keep the washer/dryer stack close to the wall.

    I've dug up some posts here that say I "can't" put a trap in the wall, and others that say (specifically) a sink's trap "shouldn't" be in the wall. And of course I've got my laundry trap buried between the studs, and my shower trap below the floor, so...

    For my trap, I'm planning a cleanout right above the entry point, where the condensate drips in. I figure I have options:

    - cut an access hole in the wall to get to the cleanout, or
    - put an access panel over this section of wall, or
    - "box out" this section of wall with drywall, leaving the trap and its connections exposed and accessible.

    Words of wisdom? Preferences? Again, looks aren't important since a washer will be parked in front of it.
  2. Ian Gills

    Ian Gills Senior Robin Hood Guy

    Jul 24, 2007
    Robber, with some DIY on the side.
    You can never have too many access panels. Put an access panel in so the trap is accessible.
    I use access panels for everything. Gas valves. Electrical boxes behind walls that I could not be bothered to move. Plumbing. The lot.

    The only drawback is the cost, which is why many pros would not use them.
    Last edited: Mar 8, 2011
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  4. speede541

    speede541 Member

    May 1, 2010
    Thanks, Ian. I actually like the idea of a boxed-out, open section of wall better -- simple looks, simple to get at, easy to spot a leak... BUT I wasn't relishing having to install drywall around the 4 pipes and an electrical conduit transiting this small space. An access panel will certainly be easier for me!
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