How To Fix Cracked Window Sill

Fix any small or medium cracks in your concrete window sill with caulk.

How to fix cracked window sill.

Then we used a hammer and banged popped the sill upwards being careful to avoid any further damage. Dig out damaged wood image copyright. How to repair weathered wood sills. It is important to prevent water moisture from getting under your window this is a short video to show how easy it is to seal up the cracks in your concret.

Rub the surface of any and all damaged areas with a stiff brush. Remove the excess material build up on the putty knife. How to repair a concrete window sill preparation. 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.

Switch to a 220 grit sanding sponge to finish off with a very smooth surface. Finishing the mortar joint. Any wood that is loose or rattling. Use a random orbit sander for the best results.

Step 1 clean the surface. With any luck this re work may keep the crack closed up. Sometimes a skirting trim or board is installed under a sill like this to help support the sill. Scrape the sill with a metal scraper to remove chipped or peeling paint.

Do this before trying to fill the crack with any kind of filler. Using a small putty knife starting at the window smooth the caulking flush to the sill. Remove as much concrete debris as possible. Sand the surface with a 100 grit sanding sponge.

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. Sand the sill with 100 grit paper to smooth the surface for priming. We pulled out the rest of the nails that were left behind. Resist the urge to keep touching and fiddling with the look of the smoothed caulking you will probably make it look worse.

You will need to raise one side or the other with plastic. Step 2 remove loose wood. Step 1 use a putty knife or a paint scraper to remove the peeling and cracked paint.