Repair Water Damaged Wood Window Sill

Most window sash and sill damage is caused by moisture in the form of condensation getting into the wooden window sill.

Repair water damaged wood window sill.

Actual footage from a job repairing water damaged window sills. How to refinish a stained water damaged window sash. Sand the wood with a fine grit sandpaper. Moisture problems are common on wooden framed windows.

Where the damage in the photo above is large it fortunately has not extended to either side of the vertical trim board. Restoring a sill ranges from the application of toothpaste and baking soda for water stains to the more labor intensive process of repairing rotting wood with epoxy primer and wood filler. Oxalic acid wood bleach. Remove any splinters and rough or peeling paint until the damaged sill is as smooth as possible.

Drill pilot holes every 16 inches or so through the new sill s front and back edges. But with the magic of a good wood epoxy you can save damaged wood like this and make it look like new. Repair rotted window sill. Trim the back edge of the new sill as needed so that its lower edge fits tightly against the siding and its back edge fits against the old wood.

Repair any rotten spots on the old sill with epoxy. If you ve got badly weathered window sills you re not alone. A water damaged window sill can however be brought back to its best with a minimum of knowledge or know how. They have direct water exposure from the outside and sometimes condensation forms on.

Condensation forms on the windows when the temperature outside cools down and in return lowers the temperature of the glass on your window. A window sill is the bottom portion of the window and usually but not always has a lip that overhangs the trim molding and over time these can get damaged or even rot. Rot moving up vertical trim boards. What causes window sash damage.

Run a bead of waterproof marine grade adhesive along the old sill. Some paint can remain on the sills but it must.