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Thread: Sealing the tub deck

  1. #1
    DIY Junior Member inexplorata's Avatar
    Join Date
    Oct 2008

    Default Sealing the tub deck

    So I've finished building the platform for a drop-in fiberglass roman tub, and I'm wondering what you guys would do next.

    The Executive Design Committee said she wants the top and front to be finished with this dark wood lock-n-fold flooring she found on sale somewhere. So before I start putting that down, would y'all suggest something between the 3/4-inch plywood and the flooring that might help with the fact there will likely be water around?

    I can't imagine typical wood floor underlayment has much in the way of water resistance... I'm thinking cement board, but can't help feeling that's overkill. My other thought is to just seal the heck out of the wood after it's snapped together.


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


    Recipe for disaster. Most, if not all, of that type of flooring has some particle board (maybe mdf, but that's not any better) in it which is essentially ground up wood with a binder pressed together. When it gets wet, it expands like a new sponge. There is nothing you can do to waterproof that well enough to last long term if water is left on it. It may last awhile if you are careful to wipe up any splashes.

    The biggest vulnerability is probably the cut edges, but the quality of the joints on some is not that great, either.

    To keep the plywood intact, you could use RedGard from www.custombuildingproducts.com. Home Depot carries it as do many tile stores. Another thing would be Ditra from www.schluter.com. Both of those are designed for use with tile. Ditra is waterproof, but you'd need to seal the joints with KerdiBand to make the whole installation waterproof.

    I think you'd be better off either tiling the top surface or using a solid surface slab (corian silestone, etc.). The vertical surfaces could be wood but again, the edges are the most vulnerable.

    If you decide on tiling, check out www.johnbridge.com
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Master Plumber Redwood's Avatar
    Join Date
    Dec 2007


    Tell her this comes from Redwood...

    Honey there is a little problem with what you want... Click Here!

    Hopefully it gets you off the hook on what the Executive Design Committee wants.
    Fortunately my wife usually gets what she wants but allows me absolute veto power...

    If You go ahead with the existing plans then you'll be singing this...

    It didn't turn out too good Click here!
    Last edited by Redwood; 11-19-2008 at 05:16 PM.

  4. #4
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    wood + water = NO


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