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Old 08-01-2012, 01:13 PM   #1
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Porcelain Installation On Concrete With Ditra


Hi all! So, I'm installing porcelain tiles on concrete using Ditra underlayment. The Schluter instructions specify unmodified mortar for layers between concrete and Ditra, as well as between Ditra and the tile. I've been reading that many installers still use modified for both mortar layers, leaving a day to allow proper curing. Is this still thinking applicable to concrete? Or only for a wood subfloor?

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Old 08-01-2012, 04:01 PM   #2
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Porcelain Installation On Concrete With Ditra


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Originally Posted by jracks3
Hi all! So, I'm installing porcelain tiles on concrete using Ditra underlayment. The Schluter instructions specify unmodified mortar for layers between concrete and Ditra, as well as between Ditra and the tile. I've been reading that many installers still use modified for both mortar layers, leaving a day to allow proper curing. Is this still thinking applicable to concrete? Or only for a wood subfloor?
Unmodified needs air or moisture to cure modified doesn't.
I think the reason they say to use unmodified is for concrete install as pose to cbu board to use modified.

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Old 08-01-2012, 05:49 PM   #3
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Porcelain Installation On Concrete With Ditra


You got that backwards---Modified needs some air to cure---unmodified does not---

I'll leave this to a Ditra user--
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Old 08-01-2012, 06:02 PM   #4
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You got that backwards---Modified needs some air to cure---unmodified does not---

I'll leave this to a Ditra user--
I did, sorry little backwards today I should have left alone the way this days been going eeeek

http://www.schluter.com/5891.aspx
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Old 08-01-2012, 06:11 PM   #5
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Porcelain Installation On Concrete With Ditra


I know the feeling---open mouth --insert foot---
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Old 08-01-2012, 08:55 PM   #6
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Porcelain Installation On Concrete With Ditra


As you stated, you should use an unmodified mortar to set tiles on Ditra. Also use the same mortar to install the Ditra to concrete. It wouldn't hurt at all if you used a modified to install the Ditra. Something like Versabond, which is an entry-level mortar available at the orange place.

Many people have a fear of not getting a good bond when bonding porcelain using unmodified. They mistakenly think unmodified will not bond to porcelain. Generally you would indeed use a modified when setting porcelain over anything, but Ditra isn't just 'anything". So if you don't need a warranty, (I don't care about them), or can't find a good quality unmodified where you shop, go ahead and use a basic modified to set the tiles. Otherwise if you can find Ditraset or any high quality unmodified, go that way.

What specific unmodified mortar can you get near you?

Sure wish people would say where the heck they're located, it would be mandatory if I ran this place. and, it would be a better place.

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Old 08-01-2012, 09:19 PM   #7
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I do try to get locations---
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Old 08-01-2012, 09:28 PM   #8
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I know you do Mike, thanks for that. But it needs to be required when registering and before posting. It sure would help.

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Old 08-02-2012, 01:11 PM   #9
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Porcelain Installation On Concrete With Ditra


Jaz,

Thank you for the insights. I'm in Palatine, IL, which is a northwest suburb of Chicago. I have an account at ProSource where they are able to get me a quality unmodified. I actually can't find it anywhere else except big box or small e-commerce online with crazy shipping charges. Anyhow, I can get the unmodified, but I've been getting the feeling that people don't like it. My tile installer has never used it. I've been researching this on my own, as I want it done right and have the means to make sure it is done that way.

Jamie

Last edited by jracks3; 08-02-2012 at 01:13 PM. Reason: quality unmodified mortars I was looking into were Tec Full Set, Durabond Ditra-Set and Mapei Kerabond
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Old 08-02-2012, 01:18 PM   #10
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Porcelain Installation On Concrete With Ditra


Kera Bond is available at Menards---Mepei---
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Old 08-02-2012, 01:32 PM   #11
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Kera Bond is available at Menards---Mepei---
Yes, it is but the lead time for delivery is 2-3 weeks.

Jamie
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Old 08-02-2012, 01:59 PM   #12
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Does anyone have a preference between the unmodified mortar options- Kerabond, Ditra-Set or Full Set?
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Old 08-02-2012, 09:10 PM   #13
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Porcelain Installation On Concrete With Ditra


Those are all good quality dry-set thin set mortars. I would select Ditraset though. Another good one, which I'm using for the first time on the current Kerdi shower job is Custom's Uncoupling Mat mortar. I can't tell the difference between it and Ditraset.

Palatine, chances are there's lots of Tec's Full Set, since it's made in nearby Aurora.

Jaz

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