Sloppy squeeze out will kill your layout lines.
Thinset for porcelain tile over ditra.
Thinset for laying porcelain tile on ditra with your tile size and layout i d use an unmodified.
Here is the problem ditra is a waterproof membrane.
Schluter has tested their modified thin set to make sure it works properly and will dry within a reasonable amount of time.
When sandwiched between two impervious layers such as ditra and porcelain tile drying takes place very slowly through the open grout joints.
Tile is bought no turning back there.
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Which it sounds like i might need 3 different thin sets if the glass subways need different thin set.
Suggestions on thin set would be appreciated.
I recommend you use unmodified for porcelain tiles over ditra on the floor.
Some modified thin sets will require a greatly extended drying time.
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.
I also will be tiling the bathroom floor with a 6 24 porcelain over shuluter ditra.
From lowes use laticrete s megabond equivalent to 317 thinset from home depot use their custom blend.
I hope to use the allset thin set there if i can find it locally.
Same with lippage take your time on your first few tiles to minimize lippage.
It is important to use a very good quality polymer modified thinset to install the ditra on the sub floor.
Dampen the ditra is approved for use with ceramic porcelain and natural stone tile.
It can be installed over a variety of substrates including plywood osb existing vinyl structural planks and concrete.