How To Fix Cracked Window Sill

Do this before trying to fill the crack with any kind of filler.

How to fix cracked window sill.

Fix any small or medium cracks in your concrete window sill with caulk. 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. With any luck this re work may keep the crack closed up.

Remove as much concrete debris as possible. 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. 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. Dig out damaged wood image copyright.

How to repair a concrete window sill preparation. Then we used a hammer and banged popped the sill upwards being careful to avoid any further damage. Sometimes a skirting trim or board is installed under a sill like this to help support the sill. 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. Step 1 use a putty knife or a paint scraper to remove the peeling and cracked paint. Step 1 clean the surface. Rub the surface of any and all damaged areas with a stiff brush.

Step 2 remove loose wood. You will need to raise one side or the other with plastic. Switch to a 220 grit sanding sponge to finish off with a very smooth surface. Using a small putty knife starting at the window smooth the caulking flush to the sill.

How to repair weathered wood sills. Use a random orbit sander for the best results. Sand the surface with a 100 grit sanding sponge. 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.

Remove the excess material build up on the putty knife. Finishing the mortar joint. Any wood that is loose or rattling.