Repairing Concrete Window Sills Exterior Hot!

Repairing a concrete window sill is a weekend project that saves a major renovation. For roughly $50 in materials, you can restore a sill that might cost $1,500 to have professionally replaced. More importantly, you are protecting your home’s interior from the slow, silent destruction of water intrusion.

After 7 days of curing (be patient!), apply a penetrating silane/siloxane sealer. Do not use a film-forming acrylic or polyurethane—these will trap moisture and cause spalling. A good sealer will bead water like wax on a car for 5-10 years. repairing concrete window sills exterior