I am in the process of remodeling my bathroom and instead of having just plain self sticking 12x12 squares or one piece sheet vynal I want to have/use 12x12 ceramic tiles put down. My question starts here. Can I use 1/4" pine board for the subfloor or would I have to have somthing either stronger/thicker put down in place of the pine board? If so what can be used in place of the pine board? Wonderboard/greenboard etc?????? Thanks!