Ditra and Mapei - contradicting rules. Which one is right?

Old 05-09-11, 04:34 PM
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Join Date: May 2011
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Ditra and Mapei - contradicting rules. Which one is right?

Folks, I have a dilemma. I got Ditra underlayment and 20"x20" porcelain tiles for kitchen floor. Schlutter and everyone on this forum tell to use non-modifies (Kerabond or Keraset) mortar for Ditra-Tile bond.
I went to local Lowe's to check out Mapei mortars, and saw Mapei's chart, which does say to use Ultraflex 2 (polymer-modified) for large tiles.
So, which one is it?

Thanks in advance!
Old 05-09-11, 04:49 PM
Join Date: May 2007
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Schluter is right since the situation is porcelain tile over Ditra. The chart at Lowes doesn't know you're using Ditra.

Schluter has made this a confusing issue, but they recommend premium unmodified mortar since it'll cure without the need to air-dry as modified mortars must. Many people use modified anyway, foregoing any chance of warranty from Schluter. It wouldn't be a fatal mistake to use modified mortar to set tiles on Ditra, just a waste of money and you'd have to allow more time for the mortar to dry, especially with monster tiles as your 20x20.

20x20 huh......hope the floor is very flat.


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