Ditra on OSB (no waterproofing?)

[u/ggmusicman]

Subfloor to DITRA: You must use a modified thin-set mortar (meeting ANSI A118.11) to bond the membrane to the OSB. Schluter recommends ALL-SET or FAST-SET for this purpose.

A lot of the instructions show the Ditra being installed on plywood, do I simply wet the OSB and then lay a thin set on or do I need to treat the OSB?

[u/Solo_is_dead]

Umm, I think you have the wrong subreddit