Window sills are designed to divert water away from the house and as a result they get a battering from the weather over time wooden sills can rot and concrete window sills can develop cracks.
Concrete window sill repair.
Apply a 3 8 inch thick layer of concrete all over the sill with a trowel following any contours to mimic its original shape.
Use a paintbrush to apply concrete bonding agent to the entire window sill.
Resurface stained or cracked concrete window sills with new concrete.
Your sill probably isn t this fancy.
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Rub off flaking paint or loose concrete along the crack with the wire brush and make sure to clean out any moss that may be growing inside.
Repair concrete window sills hi i have a concrete window sills which have some weathering damage on top.
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.