hmmm. Not sure about that. i would think you can. I have a wooden floor that is painted thick with exterior floor paint. As long as the litter doesnt get wet I think it would be fine. I already have about 6 inches, I will change it before fall comes though.
Im going to be using the deep litter method this winter. I will start in the fall, and not clean it out until late spring when the ground starts to thaw. Ive read the bedding might get up to 10inches.