Repairing Exposed Window Framing

Assess the level of damage on the window framing. If the damage is more than 10 percent, it is beyond repair and requires replacement; otherwise, it serves only as a safety hazard.

Remove loose wood from the rotted sections of the framing. Hollow out the rotted area with a screwdriver if the damage is small, or use a drill if the damage is extensive. If you are using a drill, hollow out the damaged section from the middle of the wood and work your way outward, using a circular motion. Work carefully so you remove only the damaged wood.

Apply an even coat of wood preservative over the window frame to prevent the rot or damage from spreading to the surrounding wood. Use a paintbrush to cover the inner edges and corners of the frame. Alternatively, apply the preservative only over the hollowed section of the frame and 2 inches around it, if you cannot treat the entire frame.

Insert wood putty into missing sections of the frame with a putty knife. Depending on the extent of the damage, you may be required to build the putty in layers until it fills the gap and falls flush with the surrounding wood surface.

Wipe away excess putty from around the repaired section with a damp cloth. Leave the putty to dry for 48 hours so it adheres to the surrounding frame surface.

Rub the repaired surface of the frame with rough-grade sandpaper to smooth it out. Work in a small circular motion so it blends with the surrounding frame. Replace the sandpaper with fine-grit sandpaper and rub the entire window surface for a uniform appearance.

Stain the window frame lightly with a paintbrush and leave it to dry thoroughly. Apply two coats of paint over the entire frame, not just the repaired patch, so the surface appears smooth and uniform. Allow each coat to dry before applying another one.