Natural details permeate today's most popular interior styles, giving tongue and groove wood ceilings plenty ... check their condition. Put plywood or slats over worn or uneven joists to give ...

3/4-in. tongue-and-groove plywood or OSB (oriented strand board). No extra layers of underlayment are required. Just screw the floor down with 1-5/8 in. drywall screws spaced every 6 in.