How to replace a bad rim joist?

To replace a bad rim joist, first ensure the area is safe by supporting the structure with temporary braces or jacks. Remove any insulation and cut away the damaged rim joist using a saw, ensuring you maintain the integrity of adjacent joists. Cut a new rim joist to the same dimensions as the original, then secure it in place with nails or screws, ensuring it is level and properly attached to the adjacent framing. Finally, replace any insulation and seal the area to prevent moisture intrusion.