Keep the edges of the tile clean.
Thinset for porcelain tile over ditra.
Plan on going slowly very slowly.
I recommend you use unmodified for porcelain tiles over ditra on the floor.
Sloppy squeeze out will kill your layout lines.
Suggestions on thin set would be appreciated.
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.
Thinset for laying porcelain tile on ditra with your tile size and layout i d use an unmodified.
When sandwiched between two impervious layers such as ditra and porcelain tile drying takes place very slowly through the open grout joints.
Some modified thin sets will require a greatly extended drying time.
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In general we don t recommend the use of modified thin set mortar to set tile over the membranes because these mortars must air dry to cure properly.
Tile is bought no turning back there.
Same with lippage take your time on your first few tiles to minimize lippage.
I hope to use the allset thin set there if i can find it locally.
Schluter has tested their modified thin set to make sure it works properly and will dry within a reasonable amount of time.
Some modified thin sets will dry properly between ditra and porcelain tile but not all will.
Dampen the ditra is approved for use with ceramic porcelain and natural stone tile.
Here is the problem ditra is a waterproof membrane.