On Sun, 12 Jul 2015 07:27:56 -0500, Leon was heard to mutter:
Contact the manufacturer and see what they have to say. Only their
response will be the one that matters.

ts of "floating" solid vinyl flooring out there, as well as
perimeter glued - but OSB has enough "texture" to it that it could
"telegraph" through and show. As said - check with the manufacturer of
the new flooring. Possibly, with a new floating floor, just a layer of
the very thin high density foam used as an underlay for laminate would
do the job???

I get the 'contact manufacturer' thing...

My rooms came with sheet vinyl over OSB.
It was installed in the plant; no brand name given.

Due to very low door frames, I can't put down thick plywood and then
flooring. I might be able to do 1/4" ply but some floating floors come
with a pre-attached underlayment that could make it too thick. Only
thing under the carpeting is typical carpet foam over OSB.

Thanks for the replies.