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Old 01-28-2017, 03:16 PM   #1
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Proper thinset for 12x24 porcelain?

Hey all,
I've searched through the threads and can't find a solid answer. I'm installing 12x 24 porcelain on a tub surround over kerdi and the same tile on a concrete floor with ditra. At the advice of folks here I've done a bunch of tile over kerdi using regular versabond thinset with great results. I've also read that using the versabond LFT is not desireable due to the sand content with kerdi. I know schluter says no to anything modified but many people get fear resullts and accept voiding the warranty which I am fine with.

So my question is what's my best option?

1- can I just use regular versabond even though it says up to 15" tile?
2- custom also makes a stone/ large format thinset. It's nearly twice the cost but is it the right choice?
3- is there another readily available option? I.e. Big box store
4- is the versabond lft actually an ok choice?
5- if none of this is realistic I can suck it up and order thru a local tile place.

As always thank you all!!
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Old 01-28-2017, 04:38 PM   #2
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If you aren't worried about the warranty, I'd use either one of the Versabond thinsets you mentioned.

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Old 01-28-2017, 04:59 PM   #3
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What Davy said.

The problem with the Versabond LFT, or any of the LHT mortars, is in the installation of the Kerdi membrane, not the setting of the tiles over either of the membranes. The more course aggregates in the LHT mortars makes it difficult to get the membrane overlaps the way you want'em.

And if your walls are flat and your tiles are flat you don't need any kind of LHT thinset mortar to set your shower wall tiles.

My opinion; worth price charged.

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Old 03-06-2018, 03:32 PM   #4
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This is old but I have the same question on 8x 40 porcelain tile over ditra. Any new recommendations? The versabond lft changed to natural and stone, has that altered its appropriate use?
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