How To Fix Cracked Window Sill

How to repair weathered wood sills.

How to fix cracked window sill.

Step 1 clean the surface. Fix any small or medium cracks in your concrete window sill with caulk. With any luck this re work may keep the crack closed up. We pulled out the rest of the nails that were left behind.

Sometimes a skirting trim or board is installed under a sill like this 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. How to repair a concrete window sill preparation. Any wood that is loose or rattling.

Use a random orbit sander for the best results. 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. Fit the narrow tip. Step 2 remove loose wood.

Dig out damaged wood image copyright. Remove as much concrete debris as possible. Do this before trying to fill the crack with any kind of filler. Step 1 use a putty knife or a paint scraper to remove the peeling and cracked paint.

Rub the surface of any and all damaged areas with a stiff brush. Resist the urge to keep touching and fiddling with the look of the smoothed caulking you will probably make it look worse. 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. 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. Sand the sill with 100 grit paper to smooth the surface for priming. Sand the surface with a 100 grit sanding sponge. You will need to raise one side or the other with plastic.

Finishing the mortar joint. Using a small putty knife starting at the window smooth the caulking flush to the sill. Remove the excess material build up on the putty knife.