(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 2 of 2

Thread: Moving toilet drain across joists

  1. #1
    DIY Junior Member
    Join Date
    Oct 2007
    Salem, Ohio

    Question Moving toilet drain across joists

    I am in a remodeling project at home and have to move the toilet to the other side of the wall that the vent stack/ drain are in. I have to cross two joist to get to the new location, and would like to know how to reinforce them so as to not weeken there ability to suport the floor once the holes are made.

    I was thinking of anchoring predrilled angle iron as a bridge above the new pipe to restore its integrity, but would like someones opinion about this before I take a saw to the joists.

    If there are any other means of doing this, please let me know.

  2. #2
    Jack of all trades frenchie's Avatar
    Join Date
    Dec 2006
    Brooklyn, NY and Fire Island, NY


    What size joists?

    What size pipe?

    A piece of angle iron across the top won't do it: you need to reinforce above and below (the top's in compression, the bottom's in tension, and both are completely necessary.

    Maybe a set of them, above and below... depends on the size of pipe vs size of joist. Personally, I'd want an engineer to spec that sort of solution. A few hundred bucks, but I sleep better at night.

    Other, more straightforward options:

    - make the new connection lower, so that the pipe runs under the joists. Depends on what's downstairs.

    - reframe that section of the floor, the way you would for a staircase or skylight opening, with a doubled header at each end.

    - my favourite: change the design, so as to avoid the problem in the first place.
    Last edited by frenchie; 10-24-2007 at 09:54 PM.
    Master Plumber Mark:

    there is nothing better than the
    manly smell of WD 40 in the air
    while banging away on brass with a chisel and hammer...

    it smells like......victory......

    do not hit your thumb...
    Just so everyone's clear: I'm the POODLE in the picture ("french", get it?) The hot woman is my wife.


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts