Repair Window Sill Concrete

Drill pilot holes every 16 inches or so through the new sill s front and back edges.

Repair window sill concrete.

Your sill probably isn t this fancy. If the sill is plain concrete it will not need to be painted. However you should be able to purchase grey exterior filler which will be a close match to the concrete. Fill the crack with multi purpose exterior filler.

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. Keep the sill in one piece so you can use it as a model when cutting the new sill. If the sill is painted repaint the whole sill as this will give an overall better finish. Using a small putty knife starting at the window smooth the caulking flush to the sill.

You may also need to pry away trim material known as side casing. Fix any small or medium cracks in your concrete window sill with caulk. Repairing window sills isn t a hard diy and i try to share simple ways to make diy improvements to your home. Finishing the mortar joint.

Run a bead of waterproof marine grade adhesive along the old sill. Repair any rotten spots on the old sill with epoxy. 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. Scrape away any mess with the edge of the knife.

Remove the excess material build up on the putty knife. Trim the back edge of the new sill as needed so that its lower edge fits tightly against the siding and its back edge fits against the old wood. 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. Resist the urge to keep touching and fiddling with the look of the smoothed caulking you will probably make it look worse.

Use the crow bar or chisel to slowly pry the windowsill off the window. 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.