How To Replace Window Sill Inside

Next cut underneath the window sill to free the sill from the trim board under it.

How to replace window sill inside.

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. Wooden sills have a tough time standing up to the elements year in and year out. It can cause it to rot warp or crack. In this video i help out one of my subscribers and give you step by step instructions to repair a water damaged window sill.

Here s a link to the router bit https amz. Since this video i learned about a router bit for profiling the edge of window sills which is easier. I demonstrate how to remove a rotten window sill. Your window sill is the bottom portion of your window running horizontally within the jamb resting against the outside of the window sash.

The first step for how to replace an interior window sill is using your utility knife to cut the caulk between the window sill and the trim. Sink your nails with a nail set. Even if the window doesn t leak water condensation takes a toll on the sill. Re install trims on the sides of the window and under the sill.

Tap the new sill into place using a rubber mallet. Nail a finish nail 1 2 inch from the inside window casing on each side. Nail finish nails at each back corner and along the back every 12 inches. How to replace an interior window sill.

If your sill is rotting or falling apart replace it with these simple steps. Repairing window sills isn t a hard diy and i try to share simple ways to make diy improvements to your home.