Fix Cracked Window Sill

Sometimes a skirting trim or board is installed under a sill like this to help support the sill.

Fix cracked window sill.

Spread and flatten the caulk with a small putty knife. I prefer using a glue brush to help the epoxy work down into cracks and crevices. See below for tools and a shoppin. This old house general contractor tom silva shares some tricks of the trade for installing a new long lasting windowsill.

You will need to raise one side or the other with plastic. Fill thin fissures 1 8 inch to 1 4 inch wide with a concrete patch sealer. With any luck this re work may keep the crack closed up. Other sill repairs can extend from basic maintenance to reconstruction of the sill.

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. Once it is ready you can apply it to the surfaces that require stabilization and repair. Step 1 fix any small or medium cracks in your concrete window sill with caulk. 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.

A split cracked or simply weathered window sill can detract from an otherwise beautiful window. We pulled out the rest of the nails that were left behind. Repairing window sill damage is typically simple. Repairing weathered sill finishes is simply a matter of sanding and repainting.

Sand the surface with a 100 grit sanding sponge. Fit the narrow tip of a bottle of silicone latex caulk into each crack and overfill it by about inch. Chip says apply painter s tape around the edges of each crack. Step 1 use a putty knife or a paint scraper to remove the peeling and cracked paint.

First we ran a cutting blade this is my favorite caulk removing tool around all the edges including between the underneath trim and the window sill. In a disposable container mix up your batch of liquidwood remember the 1 to 1 proportions and let it setup for about 15 minutes. 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. The sill or lower horizontal wood plate extends into the room creating a target for impacts and other damaging factors.

Then we used a hammer and banged popped the sill upwards being careful to avoid any further damage. Do this before trying to fill the crack with any kind of filler.