Ray,
the cork flooring is actual flooring. It is said to have very good ware. I thought about the moisture issue with the hair jet also. I thought maybe lay some of the plastic/foam sheet underlayment, very thin about 1/8" thick. Then lay the jet hair. Over that I would lay vinyl flooring, Homedepot sells it. It looks like pergo but is vinyl, and it interlocks with sticky tabs. It doesn't glue to the floor.
I thought about the rigid board, but I was told that you MUST put down something harder over the foam, like paneling or plywood, or the foam would get big indents in it and eventually break down.