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Discuss weberset spf question in the Tile Adhesive / Grout Advice area at TilersForums.com.
"Immediately after the Schluter -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." Copied from Ditra 25 data sheet (6.1). Therefore as a modified (SPF) adhesive required for the porcelain tiles Shluter are saying to use it!wouldn't use spf on ditra only because if it sticks to the orange the ditra will not work as a uncoupling membrane
you missed copying"Immediately after the Schluter -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." Copied from Ditra 25 data sheet (6.1). Therefore as a modified (SPF) adhesive required for the porcelain tiles Shluter are saying to use it!
I just checked the Schluter web site installation instructions for ditra 25 and it is still as I stated. I understand what you are saying regarding not to bond to the plastic (with for example a two part addy) but there is still no warning in the online fixing instructions.you missed copying
"Using the thin-bed method and following all applicable industry standards, set the tile or stone covering directly on the Schlüter®DITRA 25 in such a way that the tile adhesive becomes mechanically anchored in the square, cut back cavities of the Schlüter®DITRA 25 matting.
notice the mechanically anchored and not chemically fixed.
but if fitting, say gulf stone who recommend a two part adhesive or the TM equivalent as favoured by many members on here, Schluter say you mustn't use these adhesive on ditra due to these adhesives bonding / chemically fixing to the plastic and stopping the product uncoupling.
Also care should be taken if laying tiles "immediately" after laying the ditra. un-cured adhesive sticking the ditra mean tiles can't be lifted without pulling the ditra up.
Reply to weberset spf question in the Tile Adhesive / Grout Advice area at TilersForums.com