Indicates the "drip groove" or the slope of the sill is no longer effective. How to Repair a Rotting Wooden Window Ledge
If a chunk of the concrete has broken off, use a masonry patching compound. You may need to "build" the shape in layers if the repair is deep. window ledge repair
Once the filler is rock hard (usually 24 hours), sand it down. Indicates the "drip groove" or the slope of
Window ledge repair is forensic, material-specific, and detail-driven. A lasting fix respects the physics of water, the chemistry of materials, and the geometry of drainage. The difference between a smear of caulk and a true repair is the difference between revisiting the ladder every spring—or walking past a dry, solid ledge for decades to come. the chemistry of materials