Cement Window Sills or Concrete Window Sills

It is common to find concrete or Cement window sills on older homes than newer ones. Such homes are often historical and the owners have to put in a lot of effort and hard work to keep them in good condition. You may have a lot of knowledge regarding household repairs but even the most knowledgeable home dwellers find themselves confused when it comes to repairing a concrete or cement window sills. Your concrete seal may undergo several types of damage. Each damage should be repaired the correct way so that both the integrity of the window sill and the safety of the window are maintained.


Step 1:  The surface of any damaged area should be rubbed with a stiff brush. Try to remove as much concrete debris as you can.

Step 2: Use rough-grit sandpaper to sand any rough concrete areas. You should try to make the concrete as even as possible.

Step 3: The concrete or Cement window sills should be rinsed well to wash off the loosened concrete and sanding dust. Wait for 2 days for the window sill to dry out completely.

Horizontal Surface Repairs:

Step 1: The small or medium cracks in your concrete or Cement window sills should be fixed with caulk. The narrow tip of a bottle of silicone latex caulk should be fitted into each crack and overfilled by ¼ inch. The caulk should then be spread and flattened with the help of a small, putty knife. Any mess should be scraped off with the edge of the knife.

Step 2: Fitted areas should be filled or corners and edges should be recreated with prepared concrete patch. The corner of the trowel should be used to push the soft patch product into pits. The flat surface of the trowel should then be used to smoothen and shape the patches.

Step 3: New concrete should be used to resurface stained or cracked window sills. Pick up a paintbrush and apply concrete bonding agent over the entire window sill. A 3/8 inch thick layer of concrete should be applied all over the sill with the help of a trowel.

Step 4: It takes one or two days for the repairs to dry. Once they’ve dried, it’s time to cure new concrete for approximately 5 days.

Vertical Surface Repairs:

Step 1: In order to make vertical crack repairs, use epoxy. The injection ports included in your kit should be injected along the crack pushing them in as far as possible. One port should be placed at each end of the crack and the others should be spaced ½ inch to inch apart.

Step 2: Coat the damaged area inside and out with epoxy adhesive by using a paintbrush. Make sure that you get the adhesive as close as you can to the ports but not on top of them. You then have to wait for three minutes until the adhesive becomes sticky.

Step 3: Fill the injection ports with epoxy, starting from the lowest to the highest port. You should stop filling the current port if you can see the epoxy in the hole of the one above it. Each port should be covered with its corresponding cap and the epoxy should be left to dry for 2 days.

Step 4: The injection ports should be hammered at a 45 degree angle. Then, each port should be pulled out of the crack. A putty knife or paint scraper should be used to remove the excess epoxy on the window sill.


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