Some modified thin sets will dry properly between ditra and porcelain tile but not all will.
Thinset for porcelain tile over ditra.
Sloppy squeeze out will kill your layout lines.
Schluter has tested their modified thin set to make sure it works properly and will dry within a reasonable amount of time.
Suggestions on thin set would be appreciated.
It can be installed over a variety of substrates including plywood osb existing vinyl structural planks and concrete.
Plan on going slowly very slowly.
Here is the problem ditra is a waterproof membrane.
Some modified thin sets will require a greatly extended drying time.
Same with lippage take your time on your first few tiles to minimize lippage.
Tile is bought no turning back there.
Keep the edges of the tile clean.
Which it sounds like i might need 3 different thin sets if the glass subways need different thin set.
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Thinset for laying porcelain tile on ditra with your tile size and layout i d use an unmodified.
I hope to use the allset thin set there if i can find it locally.
I recommend you use unmodified for porcelain tiles over ditra on the floor.
When sandwiched between two impervious layers such as ditra and porcelain tile drying takes place very slowly through the open grout joints.
It is important to use a very good quality polymer modified thinset to install the ditra on the sub floor.
From lowes use laticrete s megabond equivalent to 317 thinset from home depot use their custom blend.