As mentioned when you have to pick a tile up and re install it you will have to do this more than once the suction of the tile can pull up the ditra mat causing it to break the bond to the plywood.
How to install ditra mat on plywood.
I want to install 12 porcelain tile with ditra on our foyer.
Will the thinset layers plywood ditra and ditra tile be 3 8 or less.
The problem is i only have enough room to install 1 4 ply over the existing subfloor.
Ditra has a fleece on the back side that becomes embeded into the thinset.
This will allow the ditra mat to lay flat.
Time to install the mat i grabbed the schluter ditra xl and carried it upstairs this was much easier than carrying up the 20 or so bags of concrete it would have taken for the other option the 175 sq ft roll of schluter pad we had weighed about 10 pounds.
I think i m going to be cutting it close but will be okay assuming that thinset raked with a 1 4 square notch trowel will wind up compressing to about 1 8 after setting the tile and a 1 4 v.
Subtracting the tile and ditra thickness leaves me with 3 8 left for thinset.
The joists are 2x6.
The floor is 16 oc with a joist span of approx 65 with about half of it resting on the foundation.
This is what creates the bond between the ditra mat and the plywood or o s b.
Step 4 embed the ditra mat into the thinset.
Again i think this is a bad idea.
Install the ditra heat mat one day and install the electric heat wire a different day.