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Thread: Redgard for tiled shower? Waterproof...

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  1. #1
    DIY Junior Member worrywell's Avatar
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    Default Redgard for tiled shower? Waterproof...

    Hello all,

    How do I waterproof a walk-in shower? I am attempting to waterprrof a walk-in shower that will be tiled on all three walls. The size of the shower will be a standard 60 x 34. Is Redgard a good waterproof sealer for the floor and walls and then tile over it. Is this possible?

    I do not want to use a pan liner, just a liquid waterproofer. The reason is that the home is located in Baja Mexico and liners are practiced yet.

    The subfloor is cement and the shower is located on the second floor. I just installed the 1/2 durolock cement boards for HD on the walls. What is next?

    Thanks!

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Redgard is a good product, have you read the installation instructions? They are fairly detailed.

    You really do need a sloped bed and a preslope, though for the pan.

    The hardest part of the install is ensuring you have the prescribed thickness without voids or bubbles.

    There are surface applied membranes that work well, too. www.schluter.com makes Kerdi, which may be eaiser in some ways, and is maybe less prone to install errors. Noble makes some that work well, too.
    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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    Plumber jimbo's Avatar
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    I would check over with the tile guys at this forum: www.johnbridge.com, to see if redguard by itself is can be the waterproof foundation on walls or floors, in lieu of cement board on walls, and vinyl liner or copper pan on floor.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    REdgard is an approved substance to build the liner of a pan with. Most of the pros prefer Latticrete's version which requires embedding fiberglass reinforcement bands on the corners. The procedure is described on www.custombuildingproducts.com website. Most of the pros don't particularly like it - they prefer a traditional liner, a sheet surface membrane like Kerdi, or to just use the Redgard as a wall, niche, surface waterproofer and do the pan normally. When you are painting/rolling the stuff on, it is really hard to know when you've built up the required thickness so it will work properly. Too thick and you've got stability problems, too thin, and it is just too easy to breech it.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    DIY Junior Member worrywell's Avatar
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    Question applying Redgard. After I apply the Redgard it to all shower walls and floor, do I have to apply a coat of cement on top of the redgard or can I start tiling with my mortar?

    Thanks!

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    Once the Redgard has dried/cured, it is designed to have the thinset and tile applied directly. Suggest you go to their website and read the installation instructions...you'll want to follow all of the proper steps to make the system waterproof.

    It's been awhile since I read them, but I think they intend the pan liner to be done in a similar manner as if you had used a sheet liner. Double-check...if this is true, there is a preslope, Redgard, then the final setting bed, then the thinset and tile. I'm not sure it is designed for direct placement on the pan for tile. In other words, on the floor (as opposed to the walls), I'm not sure if it is intended to be tiled over directly. Normally, you'd use a clamping drain with weep holes that allow the moisture that gets under the tile and grout to flow down to the waterproof membrane, and out the weep holes.

    The only systems I'm familiar with that have the waterproofing right underneath the tile is Wedi, and Kerdi. There may be others, double-check the installation instructions for Redgard. I loaned my TCNA spec out, and can't look it up, but the www.custombuildingproducts.com website should have their installation instructions on it.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  7. #7

    Red face

    RedGard is a great product when installed properly. It is approved for walls, ceilings, shower pan liners...and yes, even steam
    showers.

    I have been a pro for 25 years and the stuff has not failed me yet...and I have been using it since it first came out.
    IMHO, it is much easier than kerdi and nobleseal.

    I always use mesh tape around the drains and where 2 surfaces meet. It allows you to encapsulate the entire shower from
    the ceiling to the drain. You can brush, roll, and even spray it on ( use a size 25 to 29 tip ) and man it goes on quick.

    It's perm rating is great and test show that when cured, it can stretch 5 1/2x it's size without leaking. Now why wouldn't
    anyone want to use a product like that?

    I often hear tile guys put down Redgard, saying Kerdi this or Noble that...and scratch my head....as it can marry to an adjustable ring drain and is so quick and can carry a Manufacturer's LIFETIME WARRANTY...yeah you read that right.

    Build dozens of tile showers in a new hotel....and tell me that manually applying Kerdi or Noble is quicker than spraying 45 mil
    of Redgard.....cause it aint so.

    My opinion....Worth the price charged
    Last edited by Keith the tile guy; 10-24-2011 at 07:39 PM.

  8. #8
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-15-2014 at 03:47 PM.


    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

    Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.

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    DIY Junior Member Ceci's Avatar
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    Hi John,

    I have a question if you don't mind. Would it create a problem if one were to do the preslope, then put in a Oatey pan liner, then the final mudbed, and then redgard the whole thing? Just asking since someone who came out to my house stated he does it that way. Never heard of using both the Oatey pan liner and the redgard over the final mud bed. He would use the redgard over the Hardieboard shower walls also as the way to waterproof them.

    Thanks,
    Ceci

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