Replacement options for < 1.5 inch pour?
Details: Bathroom remodel (new tub, tile wall/floor, toilet, vanity). Old tile floor came up with finger pressure, found that the gypsum concrete underneath was unstable, coming off in large loose pieces, and mildewed. Removed all gypsum concrete in the small bathroom. OSB is in great shape. Supplemental goal to install underfloor radiant heating.