Mapeii does not reccomend on Ditra !

[Rizzle from the Portizzle]

As far as I understand, yes.

so stiking porcs to ditra witch make up most floor tiles cant be guarenteed by dirta if i am understanding this right ?

 

[Concrete guy]

so stiking porcs to ditra witch make up most floor tiles cant be guarenteed by dirta if i am understanding this right ?

I'm looking for a more clear Technical PDF to see if that's what's being suggested. Preferably a .co.uk one.

 

[Concrete guy]

Here is Schluters explanation of how Ditra works:-

Uncoupling Membranes - Uncoupling Theory Part 2 - Schlüter-Systems

Here's the UK spec sheet:-

Broken Link Removed

On page 5 of that document it states:-

6.Immediately after the Schlüter®-DITRA 25
matting is installed, the tiles can be set
using the thin-bed method and using a
bonding tile adhesive that matches the
requirements of the covering.

So it doesn't state if polymer modified is or isn't an issue.

It's interesting how there seem to be different specs between UK and USA as Peter mentioned earlier.

It would be very interesting to hear Schluters clarification of this - it used to be big no no (polymer modified) when I fitted Ditra, but things change.

 

[Rizzle from the Portizzle]

Here is Schluters explanation of how Ditra works:-

Uncoupling Membranes - Uncoupling Theory Part 2 - Schlüter-Systems

Here's the UK spec sheet:-

Broken Link Removed

On page 5 of that document it states:-

6.Immediately after the Schlüter®-DITRA 25
matting is installed, the tiles can be set
using the thin-bed method and using a
bonding tile adhesive that matches the
requirements of the covering.

So it doesn't state if polymer modified is or isn't an issue.

It's interesting how there seem to be different specs between UK and USA as Peter mentioned earlier.

It would be very interesting to hear Schluters clarification of this - it used to be big no no (polymer modified) when I fitted Ditra, but things change.

its a shame they change at our cost usaly untill the real answers are found by us through trail and error

 

[Ajax123]

I would not think either adhesive is the best choice on anhydrite screed personally

 

[bugs183]

As ATS says Ditra has been used to overcome many things it wasn't designed for, but if used correctly it is a fantastic product, we've been using it for over 20 years (started when it was ribbed), and i've never had a failure.
Schluter have always said unmodified in the spec sheet, but how can that effect the uncoupling characteristics of Ditra? I'm no rocket scientist but that makes no sense. When it was introduced we were told that could could fix the Ditra to any substrate with a ready mix adhesive! So things have changed there!!!
So in Mapei's world if you can't use modified on top of Ditra then you can't fix porcelain, or some stone.
Bonkers.

 

[Concrete guy]

Schluter have always said unmodified in the spec sheet, but how can that effect the uncoupling characteristics of Ditra? I'm no rocket scientist but that makes no sense.

The explanation provided by Schluter (at the time) was that the extra polymers in modified adhesive "tack" the adhesive to the Ditra and reduce or negate the uncoupling mechanism.

I saw failure after failure with this product back in the day, I saw so many I never used it again. Since this time though the specs and design of the product seem to have changed.

I read a lot on this (and other) forums about people using this product in all sorts of situations in which it appears not to really be necessary. Quite honestly it looks like it's become the emperors new clothes.

 

[ian158]

When i purchased ditra from a tile shop they said stick it down with adhesive you use for sticking carpet or vinyl floors.

 

[DHTiling]

Schluter UK and Schluter USA give quite different advice which is odd. Modified in the UK and unmodified in America if I recall correctly.

That is correct .. i had an email from Schluter uk stating that fact... use what suits the tile and substrate.

 

[bugs183]

The explanation provided by Schluter (at the time) was that the extra polymers in modified adhesive "tack" the adhesive to the Ditra and reduce or negate the uncoupling mechanism.

I saw failure after failure with this product back in the day, I saw so many I never used it again. Since this time though the specs and design of the product seem to have changed.

I read a lot on this (and other) forums about people using this product in all sorts of situations in which it appears not to really be necessary. Quite honestly it looks like it's become the emperors new clothes.

Go to be honest here ATS i have to disagree with you here. I know that using Ditra has made my jobs more reliable. I've never had a failure whilst tiling onto wood using it, yet virtually every week you see posts where a job that has been tiled to wood directly has failed, ok i never tile to poorly supported wood floors etc, but i've seen enough solid floor fails without uncoupling.
Not sure which jobs you saw all these failures on, so i can't comment on them, but to say that it being a case of emperors new clothes is in my opinion not correct.
Yep it won't replace properly prepared screeds, but it does help i many situations, especially uncoupling underfloor heated screeds.