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Unread 01-10-2010, 03:45 PM   #1
handigirl
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Best thinset for Kerdi and Ditra?

A HD employee sold me CustomBlend unmodified thinset and Multiset to use over and under the Kerdi and Ditra in my latest bathroom project. After reading the opinions from the pros on this forum, I plan to return that junk, but am left with the need for a good, high quality thinset.

I've read John's book where he reports using VersaBond under and over the Kerdi in his showers. Is that the best I can do or is there a high quality unmodified thinset that is readily available? Most of the tiles will be 20x20 ceramic, others Glassblox mosaic. What about the Laticrete they sell at Lowes?

In my last project I used Mapei, then they stopped selling it at my local Lowes. And that was on a slab so no Ditra.

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Deb
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Unread 01-10-2010, 03:59 PM   #2
scuttlebuttrp
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If you can get Laticrete; the best one would be 272. Next to that, look for 317. These are 2 very good unmodifieds.
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Unread 01-10-2010, 04:31 PM   #3
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I've used Ditraset a few times and really like it.
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Unread 01-10-2010, 05:44 PM   #4
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272 is tough to find, 317 is all we use. Great stuff.
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Unread 01-10-2010, 05:46 PM   #5
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I always use Ditraset. It is made for Ditra and Kerdi.
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Unread 01-10-2010, 05:52 PM   #6
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The problem with Ditraset, is its not readily available everywhere. My Durabond dealer told me they can only get pallets, I told em to bring it in!
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Unread 01-10-2010, 06:54 PM   #7
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I usually use Mapie Ultraflex II which is a modified thinset. Currently I am doing my first Kerdi shower with a mortar base and am using Ditra set for the first time. Really like it thus far! If you can find it, go for it!
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Unread 01-10-2010, 06:58 PM   #8
handigirl
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Pittsburgh is about 90 minutes north of me. Are there any places to get Ditraset around there?

I'll check my local Lowes about whether I can get 317.

Many thanks,

Deb
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Unread 01-10-2010, 07:09 PM   #9
tilelayer
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Lowes won't have 317 they have something called Megabond I believe thats unmodified. You can also check the phone book for local tile supply houses and ask em who they carry brand wise in thinsets, all the companys make a good unmodified except for Custom Building Products.
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Unread 01-10-2010, 10:00 PM   #10
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Another vote for Versabond here. Unless you have some experience and speed, unmodified under Kerdi can be a real pain. It drys up very quickly, so you have to work fast. Drywall thats been primed is not too bad, but moisture sucking cement backerboard is really tough. If using backerboard, I would strongly suggest having a spray bottle with water to keep things moist as you go. Yeah, Versabond voids any warranty, but if you ever do have a failure, its going to be from something else and not because you used Versabond. Kind of a shame that Schluter is such a stickler on this, because I know experienced tile guys that went the unmodified route and swore off Kerdi forever after the very first time. Great for the makers of Redguard, not so good for Schluter.
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Unread 01-11-2010, 02:42 PM   #11
handigirl
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Thanks so much for the suggestions.

The only unmodified thinset I can get at Lowes is Laticrete's Mega Bond. I also called other local tile stores and found Durabond D-5 and Tec FullSet Plus. Which of these three is the best?

One of the stores also carries Mapei Ultraset if I decide to go with a modified thinset. How does that compare to Versabond or Laticrete's Multipurpose? I am concerned about using a modified thinset to attach large tiles to the walls over Kerdi and floor over Ditra, but would I be safe using it under the membrane? I remember reading that modified thinsets need air to fully cure.
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Unread 01-11-2010, 03:38 PM   #12
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I have used Megabond on most of my Kerdi showers. It works well, never had a problem.
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Unread 01-11-2010, 08:23 PM   #13
scuttlebuttrp
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TEC Fullset Plus is one of the best unmodifieds around. Never used Megabond.
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Unread 01-12-2010, 09:31 AM   #14
handigirl
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Thanks Kevin and Royce. I suspected the Tec was really good after what the gal in the tile store said about it and then there was the price--nearly twice the Megabond. I'll get enough to do the big tiles on my walls (those have me worried) and use Megabond for the floor. Crossville says to use a modified thinset for the glass tile so I'm thinking I should go with the Multipurpose or Versabond in those areas. Also behind the Kerdi. I tried to install it with Megabond. I sprayed the hardi until my hand went numb, but the thinset was still too dry to fully bond. I finally had to give up, scrape everything off, and order more Kerdi.

Last edited by handigirl; 01-12-2010 at 09:32 AM. Reason: wrong names
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Unread 01-12-2010, 10:01 AM   #15
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Quote:
Also behind the Kerdi. I tried to install it with Megabond. I sprayed the hardi until my hand went numb, but the thinset was still too dry to fully bond. I finally had to give up, scrape everything off, and order more Kerdi.
Another good reason to use drywall behind Kerdi.

The only place I've used Hardi under Kerdi is on the top of the curb. I do that when there's a chance someone will destroy the drywall before I can get it covered up, like in new construction. Easiest way is to have the piece pre-cut for the curb, dampen the Hardi with a sponge, flat-trowel then comb the thinset, and immediately put the Kerdi on. You don't have much time to work before the moisture is gone.
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