How to Replace a Damaged Subfloor With Plywood
- 1). Pull up the damaged top layer of subfloor, using your hammer and prybar. Take it all up, leaving just the bottom layer of wood. Go over the surface with your hammer, knocking down any raised nail heads.
- 2). Set a piece of plywood in one corner of the room, running in opposite direction as the existing bottom layer of plywood sheets. Drive 1-1/2 inch galvanized wood screws into the surface of the board every square foot. Make sure none of the screw heads are sticking up.
- 3). Set the next plywood pieces in the same manner, butting them against each other and laying them in a course, end to end, along the wall. Cut the final piece with a circular saw to fit.
- 4). Lay the next courses so that the ends of the boards don't line up from course to course. Cover the entire floor.
