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Installing Ditra Underlayment

It was decided to use Ditra Underlayment on this project because the wonderboard and heat system underlayment are only 1/4" and we didn't want to raise the floor much above the hardwood. The biggest mistake I made was to install the Ditra the next day after installing the heat system. The K/K was dry enough to walk on but not nearly totally dry.
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Ready to spread mortar for installing the Ditra. We plan on installing the Ditra under the cabinets as well.
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The Ditra is installed and tiles helped keep the corners down. That's a problem with Ditra — the ends want to curl. Waterproof, but big deal. Water does not leak in the center of a floor, it would run around the sides and go down the wall. Another example of our industry creating a product and a selling point to deal with a problem that does not exist or not in play.
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Luckly I didn't plan on installing the travertine floor next. I worked on the whirlpool and I realized that the K / K mortar under the Ditra was having a hard time drying because of Ditra being waterproof. So I cut some holes to help it out. Another big time problem for Ditra is they want you to use the cheapest mortar without additives, because of drying.
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I decided to fill in the Ditra with mortar and let it dry. That way the tile setting mortar would have a space to dry under the tile into the dry mortar. Bottom line: It's not possible to do quality tile work using a mortar that mixes with water. There are many, many reasons, too numerous to mention here.
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I used the flat side of the trowel and filled in the Ditra.
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This was a good test: this tile didn't suit so I removed it the next day after installation. I really thought it would come up in one piece but I was wrong and the bond broke in the mortar as it should. The tile bonded and the mortar dried very well with only a small piece where it delaminated from the Ditra. So I felt good about the entire floor.
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I also filled in the Ditra before installing bath floor. Normally I would use concrete board in baths that butt to hardwood but this one butt to carpet. Keeping the floor down for carpet and the threshold did not become a toe stomper.
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Ditra is not going to keep me from using a quality setting mortar. Kerabond and Keralastic gives you a huge advantage in tile installations.
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