Anybody ever hear of MR. Sandless hardwood Floor Finish?

If the the subfloor thickness is too thin based on joist spacing can you just screw down a 1/2 or 1/2 layer of ply or osb to make it up? I have 24' center to center joists and 3/4 OSB subfloor but manufacturer specifies 1 inch subfloor up to 19 inch joist spacing. Thanks again.

I am finishing my 1600sqft basement. My basement is dry most of times/yrs. I added a new interior French drain system for 100yrs storm. I didn’t see any water when I dig down for the sump pump basin. The outside surface water was also addressed 2 yrs ago. So I assume the basement is safe for finished floor. I am planning to put 1” XPS foam boards on top of the concrete floor, then cover them with plywood subfloor and then laminate/wood/ceramic tile (bathroom) floor. I need your advice on the plywood subfloor first: 1. What’s the thickness I should use, 15/32”, 19/32” or 23/32”? 2. Should I use the sanded plywood or the regular plywood is just fine? 3. I should use the subfloor plywood but not sheathing plywood? 4. At homedepot there is a subfloor plywood called [URL="http://www.homedepot.com/Lumber-Composites-Plywood-Sheathing-Subfloor-Plywood/h_d1/N-5yc1vZbu0m/R-202522977/h_d2/ProductDisplay?catalogId=10053&langId=-1&storeId=10051"]DryPly [/URL]which has a water-repellent coating. I should use it or avoid it? 5. With the T&G, can I install the plywood as a floating subfloor without Tapcon to fix them with the concrete floor? 6. Where should I leave some gaps for plywood expansion or no need them at all? thanks,