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Thread: Waterproofing drop-in tub deck

  1. #1
    DIY Junior Member djd's Avatar
    Join Date
    Jan 2008

    Default Waterproofing drop-in tub deck

    Just finishing my tub install, wondering the best way to waterproof the deck for my drop in tub. I would use kerdi but its not available here(small town Alberta). Will be skinned with concrete board, then tiled. Any suggestions?
    Last edited by djd; 03-17-2008 at 09:40 AM.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Not sure where 'here' is, but there are on-line sources for Kerdi...check out the store on www.johnbridge.com. I've used them for two personal projects, and it worked out well. They'll cut and send you just what you need, quickly. For the tub deck, I think you could also use Ditra, then you'd need either the KerdiBand, or strips of Kerdi to seal the seams to make it waterproof. Kerdi is designed to install over cbu or drywall...Ditra is designed to install over plywood or concrete. The point being that Kerdi should not be installed directly to plywood, and I think you'd want cbu there, whereas the Ditra could go directly over a plywood deck. Depends somewhat on how you layed the deck out.

    If you have a Home Depot near you, or most tile stores, you could use RedGard from www.custombuildingproducts.com. This is a paint-on (brush or roller) waterproofing material that would work in this situation. You need to tape and thinset the joints first, then after that cures, paint on the two coats of the Redgard. Once that dries, you can then tile the area. This would be easier to waterproof the edges of the tub cutout in the deck. It comes in a gallon can (or larger), so you should have plenty for this one project. The HD usually has it, but sometimes it's not where you'd expect it...
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014


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