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  1. #1
    Join Date
    Feb 2008
    Location
    Iowa City, IA
    Posts
    108

    Default Exposed Kerdi / Foamboard Under Shower Bench

    I find may times that tile is not installed over the Kerdi board at the underside of corner benches in tile showers. Is this directly addressed in the manufacturer's installation instructions? While I am sure it is preferred and intended to be covered, I am trying determine if the manufacturer says is has to be covered.

    http://s303.photobucket.com/user/Kol..._6266.jpg.html

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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    27,138

    Default Re: Exposed Kerdi / Foamboard Under Shower Bench

    First question: Is Kerdi-Board allowed/intended to be used as such a shelf?

    I looked at some installation instruction information and didn't see that use.

    I would send that photo to the manufacturer and get their written opinion (email does that) on such use and such installation. If they say "yes", then ask to be directed to the installation instruction part which addresses it ... so you can provide documentation (is the reason you give the manufacturer).

    Jerry Peck
    Construction Litigation Consultant ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    Join Date
    Mar 2007
    Location
    New Mexico
    Posts
    1,301

    Default Re: Exposed Kerdi / Foamboard Under Shower Bench

    I did 3 showers with Kerdi. That's probably 3/4" plywood wrapped with the kerdi fabric, although it's hard to tell. That's what I did for my benches. You'd have to get into the instructions to see if they don't allow it. I tiled under mine, but it's not something I would worry a whole lot about. The entire substrate is supposed to be water tight whether there is any tile present or not. It's supposed to be the big advantage of using the kerdi system.

    Jim Robinson
    New Mexico, USA

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