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


Old 05-09-11, 05:34 PM
Thread Starter
Join Date: May 2011
Location: United States
Posts: 1
Received 0 Votes on 0 Posts
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!
Sponsored Links
Old 05-09-11, 05:49 PM
Join Date: May 2007
Location: USA
Posts: 1,604
Received 0 Votes on 0 Posts

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.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: