Filling a sunken floor and laying Tile.
! have a sunken living room floor and intend to raise it to the level of adjoining rooms. The floor has porcelain tile on it, is not cracked and has been in place 10 years. The present depth is 4 3/4″ below adjoining rooms. The present plan is to raise the floor with 2×4’s, plywood, hardboard or equivalent and use porcelain tile to finish it off. Is it feasible to leave the existing tile and build up over it?