Repair Window Sill Concrete

Spread and flatten the caulk with a small putty knife.

Repair window sill concrete.

Gray would look modern. If the sill is painted repaint the whole sill as this will give an overall better finish. Keep the sill in one piece so you can use it as a model when cutting the new sill. Remove the excess material build up on the putty knife.

Drill pilot holes every 16 inches or so through the new sill s front and back edges. A window sill is the bottom portion of the window and usually but not always has a lip that overhangs the trim molding and over time these can get damaged or even rot. Resist the urge to keep touching and fiddling with the look of the smoothed caulking you will probably make it look worse. Fit the narrow tip of a bottle of silicone latex caulk into each crack and overfill it by about inch.

Use the crow bar or chisel to slowly pry the windowsill off the window. Use cement or waterproof construction glue to attach the gutter to the window ledge then paint the gutter to match the other ledges or paint them all a different matching color to update the house. However you should be able to purchase grey exterior filler which will be a close match to the concrete. Fix any small or medium cracks in your concrete window sill with caulk.

Run a bead of waterproof marine grade adhesive along the old sill. Use a utility knife and if necessary a hammer to carefully break and remove any caulking or sealant that s binding the old sill to the window frame. Using a small putty knife starting at the window smooth the caulking flush to the sill. Finishing the mortar joint.

Repairing a concrete window sill could appear to be a major job that s far beyond the skills of the average diyer but with the proper knowledge tools material and preparation you might find it s worth considering having a go yourself unless a complete rebuild is necessary. Repairing window sills isn t a hard diy and i try to share simple ways to make diy improvements to your home. If the sill is plain concrete it will not need to be painted. You may also need to pry away trim material known as side casing.

Repair any rotten spots on the old sill with epoxy. Scrape away any mess with the edge of the knife.