In thinking back to the days of installation, I do beleive that the floor was dry. I remember being initially frustrated that the SuperIsol was sucking ALL moisture out of the bed of mortar that I intended to set the floor pieces on [and eventually did not] and did not even think of wetting the floor pieces before mortaring the joints.
And adicting doesn't even cover the feeling when you fire up the oven. So much so that we are serving pizza appetizers to 23 for Thanksgiving.
J W