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!

 

Hi,

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.

Jaz