Fix Cracked Window Sill

You will need to raise one side or the other with plastic.

Fix cracked window sill. With any luck this re work may keep the crack closed up. If there is not one there you may want to push up the cracked sill and install a skirting board to help support the sill. See below for tools and a shoppin. Repairing weathered sill finishes is simply a matter of sanding and repainting.

The sill or lower horizontal wood plate extends into the room creating a target for impacts and other damaging factors. A split cracked or simply weathered window sill can detract from an otherwise beautiful window. Switch to a 220 grit sanding sponge to finish off with a very smooth surface. Repairing window sill damage is typically simple.

Scrape away any mess with the edge of the knife. Fill thin fissures 1 8 inch to 1 4 inch wide with a concrete patch sealer. Do this before trying to fill the crack with any kind of filler. I prefer using a glue brush to help the epoxy work down into cracks and crevices.

Caulk tube versions are easiest to use just squeeze the sealer into the crack then smooth it with a plastic spatula or putty knife and peel off the tape. Spread and flatten the caulk with a small putty knife. This old house general contractor tom silva shares some tricks of the trade for installing a new long lasting windowsill. In a disposable container mix up your batch of liquidwood remember the 1 to 1 proportions and let it setup for about 15 minutes.

Then we used a hammer and banged popped the sill upwards being careful to avoid any further damage. Once it is ready you can apply it to the surfaces that require stabilization and repair. Chip says apply painter s tape around the edges of each crack. Check for sill movement such as a crack where one side has settled or is down farther than the other side causing a crown and a crack.

Other sill repairs can extend from basic maintenance to reconstruction of the sill. Step 1 use a putty knife or a paint scraper to remove the peeling and cracked paint. Step 1 fix any small or medium cracks in your concrete window sill with caulk. It is possible to fill in quite sizeable holes with the masonry filler method but if the edges are crumbling away you ll need to build moulds to shape the sill correctly a job that s probably beyond most diyers skill level.

Fit the narrow tip of a bottle of silicone latex caulk into each crack and overfill it by about inch. Sand the surface with a 100 grit sanding sponge.