Repair Water Damaged Wood Window Sill

Repair any rotten spots on the old sill with epoxy.

Repair water damaged wood window sill.

Condensation forms on the windows when the temperature outside cools down and in return lowers the temperature of the glass on your window. 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. How to refinish a stained water damaged window sash. What causes window sash damage.

Most window sash and sill damage is caused by moisture in the form of condensation getting into the wooden window sill. Where the damage in the photo above is large it fortunately has not extended to either side of the vertical trim board. Some paint can remain on the sills but it must. They have direct water exposure from the outside and sometimes condensation forms on.

Actual footage from a job repairing water damaged window sills. Run a bead of waterproof marine grade adhesive along the old sill. 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.

But with the magic of a good wood epoxy you can save damaged wood like this and make it look like new. 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. Oxalic acid wood bleach. While most wood rot starts at the window sill the length of time the damage is ignored will affect the amount of damage that needs to be repaired.

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. Moisture problems are common on wooden framed windows. Wood that has been exposed to the sun s destructive rays for years without a protective layer of paint can begin to weather so badly that it may appear to be beyond saving. Rot moving up vertical trim boards.

Remove any splinters and rough or peeling paint until the damaged sill is as smooth as possible. Sand the wood with a fine grit sandpaper.