Things You'll Need:
- Skill saw
- Nail pullers
- Hammer
- Measuring tape
- 2-inch by 8-inch lumber
- ¾-inch OSB sheathing
- ¾-inch plywood
- 16d nails
- 8d nails
-
Step 1
Determine where the floor is rotting and clearly mark where it needs to be cut. Recommendations are that the area cut out should extend beyond the rotted area by one floor joist. This allows for a smooth transition from the existing floor to the new one.
-
Step 2
Set the depth of the skill saw blade to 1 5/8 inches deep. This will allow a clean cut without damaging the floor joists. Cut out the marked area. Use a reciprocating saw in close areas.
-
Step 3
Remove the rotten area first with the hammer and nail pullers. Next, remove the area that went beyond the rotted area. Be certain to remove all nails or screws.
-
Step 4
Inspect the floor joists. Since the joists are solid lumber, they will resist water damage for extended periods. However, if some of them are clearly compromised, go on to the next step, if not, skip to Step 6.
-
Step 5
Cut a 2 by 8 long enough to clear the compromised area of the floor joist at least 48-inches on either side. Secure the 2 by 8 to the existing joist with 2 rows of 16d nails on 8-inch centers. Repeat this for each damaged floor joist.
-
Step 6
Place a sheet of the OSB on the floor joists. Be certain it fits tightly to the existing floor and secure it to the floor joists with 8d nails on 8-inch centers. Repeat this until the area is closed in, cutting the sheathing as needed. OSB Seams must meet on the floor joists.
-
Step 7
Repeat Step 6 for the ¾-inch plywood. An "AC" grade of plywood is recommended for smooth finishing. Be certain that all the seams are tight.
