that was my slip. i meant ditra. so there is no screwing any board down before hand.I believe that in order to use kirdi, one must first put up some boards, say drywall, CBU, etc. Those are indeed fastened to the studs with nails/screws. (same with any bench)
Once you square and plumb those, fasten then down, then you can now apply the kerdi over what you just stuck up.
This is one of the things I try to tell people--in spite of being scolded/yelled at/namecalled/etc. If one uses denshield for a shower, one only has to put up the "walls" once.
And denshield is as "waterproof" as kirdi.
On floors, there are other underlayments that don't require any mechanical fastening, just "glue", same as some others. Foam comes to mind, but I prefer a different one. After this unit, I'm going to go back to using that on the work I do.
To each his/her own. Nothing is "the best" all the time in all situations. Everything has trade-offs.
But that's just me. :jester:
just over the subfloor with thinset under it
the nice thing about the kerdi installs i have seen is that you can use drywall, or paperless drywall for the whole bathroom and then just kerdi where the tile is going, no more running drywall around where the tile is going to leave room for tile backer board.
that is what makes alot of sense and saves time putting up bigger sheets of drywall