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Old 01-20-2018, 12:41 PM   #1
Shady at Best
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Your favorite thinset for kerdi and ditra?

I am always searching for better ways to do things. I am currently using customs versabond for my kerdi and ditra installs. Mainly due to the availability. I am also a big fan of ardex x5.

This is not a thread about what schluter recomends using. We all already know that. And the schluter ditra set and all set are horribly to work with.

I am not opposed to using a non modified thinset. I would use one as long as it can hold 2 overlapping pieces of kerdi together after 36 hours of drying.

What do you guys like using?

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Old 01-20-2018, 01:05 PM   #2
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Ditra Set is fine and I'm a fan of it....have been for years. Having said that, I find that the Mapai is a good unmodified as is the Laticrete 317.
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Old 01-20-2018, 01:23 PM   #3
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Tri-lite or x5. This may be a post better suited for the pro's hang out?
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Old 01-20-2018, 03:38 PM   #4
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Ditra-set all the time. Good to know about's Schluters new products.

" And the schluter ditra set and all set are horribly to work with. "
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Old 01-20-2018, 10:12 PM   #5
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Ditra-set all the time. Good to know about's Schluters new products.

" And the schluter ditra set and all set are horribly to work with. "
Its been awhile since I used Bostic Ditra Set. I will try that again. I am doing a job where I am installing ditra on plywood. Looks like ditra set is good for that application.

Would a primer make things better when installing ditra over plywood?



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Tri-lite or x5. This may be a post better suited for the pro's hang out?
I am down for that.

Different question.
Is 1/8x1/8x1/8 still the trowel for KERDI?

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Old 01-21-2018, 08:22 AM   #6
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Moved your thread to the Pros hangout Travis.

1. I don't, as long as you hydrate the ply as you go it will be fine.

2. Yes
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Old 01-21-2018, 08:32 AM   #7
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Favorite thin set for kerdi & ditra

Ultraflex RS / Ardex X7R
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Old 01-21-2018, 10:36 AM   #8
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Another vote for Laticrete’s 317, easy to work with and I get it for $8.15 a bag. If I want to put Ditra and Tile down the same day I’ll use 253 Gold Rapid, give it a six pack and I’m setting.
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Old 01-21-2018, 01:13 PM   #9
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I had a dream about laticrete 317 a few days ago. I think that dream was what sparked this question. In the dream i was buying 317 for 4$ a bag. It was crazy random.

I have been rewatching all the schluter vids for shiggles. ( shits and giggles) They say that you can install ditra and set tile on the same day with no special thinset. Anyone do this?

Another question. Any reason why i couldn't use painters plastic (.9mil) under a mortar shower pan, on plywood, that will be covered by kerdi?



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Old 01-21-2018, 09:45 PM   #10
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Do you guys use the 317 unmodified or do you mix some admix in?

Edit: Is this thread about thinset between kerdi/ditra and substrate, or for setting the tile? Or both? Just making sure I'm on the same page
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Old 01-22-2018, 06:35 AM   #11
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Solved that dilemma years ago. Changed from Schluter to other manufacturers. Found products that exceed them in many ways.
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Old 01-22-2018, 08:34 AM   #12
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Glad to see some MAPEI products got an honorable mention here. Our Kerabond T meets Schluter's requirement for a non-modified mortar and is specifically designed to be used with uncoupling membranes and large format tiles. If you haven't tried it, give it a shot. For the 'tile in the same day' discussion I agree with Ultraflex RS or if you're going over it with a large format tile, Ultraflex LFT Rapid is a relative newcomer that's worth a look.
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Old 01-22-2018, 08:50 AM   #13
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Dan....Recently, I've been using Kerabond for Kerdi and it works great. My local Dal dropped the 317 and picked up Mapai. It was at their recommendation that I tried the Kerabond.
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Old 01-22-2018, 07:41 PM   #14
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Quote:
Originally Posted by Shady at Best
...I am doing a job where I am installing ditra on plywood. Looks like ditra set is good for that application.

Would a primer make things better when installing ditra over plywood?
No, that's a bad idea. Using an unmodified over plywood is a bad idea. Unless you want it loosing it's bond sometime in the first 7 years. This isn't Schulter just talking, it's the whole industry. And primer wouldn't alter that. Use a mortar rated for plywood and you're golden.
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Old 01-22-2018, 09:08 PM   #15
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Quote:
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No, that's a bad idea. Using an unmodified over plywood is a bad idea. .
I know this. I have no idea why i said it. Would help if i proofread once in awhile.




Quote:
Originally Posted by dgbldr View Post

Edit: Is this thread about thinset between kerdi/ditra and substrate, or for setting the tile? Or both? Just making sure I'm on the same page
Pretty much both.

Just looking for suggestions and better ways to do things.
I Have been spoiled lately by using ardex x77. It has got me wanting to get away from customs versabond. Although i have no real beef with versabond. I would use x77 all the time if i got the same coverage out of it.

I worry about the thinset I use when doing kerdi seams. I have used thinsets where there was no resistance when peeling up kerdi band after 2 days of drying. I Have also had schluters all set fail to hold on to usg durock membrane after 2 days of drying.
I have also seen thinset pull the fleece off the kerdi after 2 days.

So basically looking for a better, easier, ways. I haven't used laticrete thinset in years. Maybe i will give there stuff a shot.





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