Window Sill Rot Repair

How to replace exterior rotted wood window sill.

Window sill rot repair.

If you find your window sill is starting to crack or chip fill them in and repair them before the wood begins to rot. But if you ve waited too long and have found rotten wood it s time to repair or replace your window sill. It s easy to figure out what you need to fix a rotted windowsill once the bad parts are out. Where the damage in the photo above is large it fortunately has not extended to either side of the vertical trim board.

Rot moving up vertical trim boards. Repair rotted window sill. 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. When you ve done this mark them on the new window sill.

Repairing window sills isn t a hard diy and i try to share simple ways to make diy improvements to your home. There are many sizes and styles of windows of course and you want to match what was there as closely as possible. Many window sills including ours are 1 1 2 thick. Step 3 cutting the new window sill.

For this project i used a solid piece of kleer cellular pvc sill that matches the profile and thickness of the other sills on the house. Step 1 getting started. Dig out the rotted wood and refill the cavity using products made specifically for this type of job. If not try to reconstruct it as closely as possible by taking measurements.

Your window sill is the bottom portion of your window running horizontally within the jamb resting against the outside of the window sash. 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. If your sill is rotting or falling apart replace it with these simple steps. See below for tools and a shoppin.

Now cut out the shape of the window sill with a saber saw making. This makes replacement simple as the new sill can be cut from a standard 2 4. This old house general contractor tom silva shares some tricks of the trade for installing a new long lasting windowsill. A simple epoxy repair will do the trick if the rot is confined to a small area but if more than 10 percent of the sill is rotten the old sill should be cut off and replaced.

We re here to show you how.