I have a bathroom that im gutting and redoing. The only portion im keeping in place is the flooring. The bathroom floor has a couple layers of different floor but the most current layer which is linoleum is asbestos containing. It is in perfect shape minus the edge that goes against the bathtub. It is beveled up a tiny bit. I would like to just throw some board over the floor then place a new sheet vinyl over it. Is there a certain board or way I should do this to make sure the floor is sealed properly? I dont want there to be any moisture getting in and building up to produce mold.