Why I Can't Use Thin-set Mortar Over RedGard Waterproofing Membrane? - Kitchen & Bath Remodeling - DIY Chatroom Home Improvement Forum


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Old 05-24-2011, 08:05 AM   #1
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


Hi.

I am remodeling my bathroom. I am ready to start tiling tub and shower surrounding walls. Yesterday I applied the RedGard Waterproofing membrane over Durock Cement boards. Then I checked the instructions on the premixed stone, porcelain and ceramic tile thin-set mortar which I am going to use to put tiles and found that it says: "Do not use over waterproofing membrane."
I already opened the 3.5-gallons mortar container and used a little of it so I can't return it. Plus I don't know what else I can use instead. I used the same mortar last year for similar project but without RedGard and it worked fine for me.
My question is why I can't use thin-set mortar over RedGard waterproofing membrane?


Thks.

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Old 05-24-2011, 10:35 AM   #2
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


Quote:
Originally Posted by sukhenkoi View Post
Then I checked the instructions on the premixed stone, porcelain and ceramic tile thin-set mortar...

My question is why I can't use thin-set mortar over RedGard waterproofing membrane?..
You can, but not the premixed stuff. What specific product do you have?

You don't want to use the premixed stuff in a shower or wet area.

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Old 05-24-2011, 10:45 AM   #3
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


I have the "Premixed Stone, Porcelain and Ceramic Tile Thin-Set Mortar" produced my SimpleSet.
It was recommended to me by Home Depot employee. I used it last year in my son's bathroom for tub surrounding wall tiles. It was easy to use and no problems so far.
Why can't I use the premixed stuff in a shower? What else can I use to tile shower and tub surrounding walls built from Durock Cement boards covered with RedGard?
My options are pretty much limited to stuff sold my HD. I also have a tile shop in my area. I'll check with them, but I don't really trust them. Unfortunately, neither I can't trust HD people.

Thanks.
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Old 05-24-2011, 11:20 AM   #4
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


I'm no expert, but Bud and Ccarlisle do know their stuff.

Check out this thread.

HELP! Granite threshold discoloration

Edited to add: And this one:

Densguard & tile caulking question

Last edited by Blondesense; 05-24-2011 at 11:43 AM.
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Old 05-24-2011, 11:44 AM   #5
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


Thanks a lot for the thread.
This is the same so called "thin-set mortar" I used last year for my son's bathroom and was planning to use for my bathroom.
My two questions still remain:
1. Why, in general, can't I use this "thin-set mortar" over the redgard membrane?
2. What is the best choice for me to use for tub and shower surround walls tiling? HD sells few thin-set mortars, but which one to select? I don't want to ask HD guys anymore as they not just useless, but also can send me to a wrong costly direction.

Thanks.
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Old 02-09-2012, 12:38 PM   #6
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


dry mix fortified thinset mortar. Mix consistency of peanut butter.

Last edited by 747; 02-09-2012 at 12:47 PM.
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Old 03-22-2012, 01:37 PM   #7
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


1. From what I have read, the premixed thinset does not dry out to form a good adhesive bond when applied over/under a non-permeable membrane like Redguard or the Kerdi-band products. The dry mix (where you add the water on-site) does.

2. The Versabond fortified thinset is a good product at $13-$16 per 50 lb bag, and will work fine for your application. The more expensive dry mix thinsets provide more flexibility to withstand expansion / contraction experienced with freeze/thaw cycles, e.g. in outdoor applications.

Good luck.
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Old 03-23-2012, 03:16 PM   #8
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


Premixed mortar, don't use it, especially for tile in a wet area. Take it back, purchase a good modified thinset "dry mix" in the bag along with a paddle mixer for an electric drill. Mix it with the appropriate amount of water to the consistency of peanut butter. Check the working time for your mortar, and apply it with the appropriate thinset trowel for the tile your installing. Easy!
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Old 03-16-2013, 03:06 PM   #9
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


I have read a few posts where the Red Gard was mixed with some parts water...Am about to apply on shower walls - do i need to mix Red Gard before i appy?
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Old 03-16-2013, 03:39 PM   #10
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Why I can't use thin-set mortar over RedGard waterproofing membrane?


sejmid please go back and add your own post.
No way to keep track of who's talking to who.

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