Add cross-framing under toilet?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by speede541, Jul 21, 2010.

  1. speede541

    speede541 Member

    Joined:
    May 1, 2010
    Location:
    Oakland
    As part of my little project I'm replacing a small square of rotted floor under a toilet -- a double layer of 3/4" ply, in fact -- spanning about 14" between parallel joists.

    Do any of you routinely install cross bracing to span between the joists for a bit of extra support under the toilet? It seems pretty beefy without, but I'm curious about best practices.
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Ply is strongest if it spans at least two bays (i.e., attached to three joists). So, since you'll have some edges unsupported, consider blocking along those edges.
     
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  4. jimbo

    jimbo Plumber

    Joined:
    Aug 31, 2004
    Location:
    San Diego
    I agree with jad's comments. I have found over the years, that for a drywall repair, or a flooring repair....a bigger patch is actually easier, stronger, and ends up better on the cosmetic front.

    A 14" square of plywood, just supported by a 3/4" lip at the joist, will be prone to sag along the open edges,and pry up on the supported edge.
     
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