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Concrete window sill repair.
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.
Apply a 3 8 inch thick layer of concrete all over the sill with a trowel following any contours to mimic its original shape.
Repair concrete window sills hi i have a concrete window sills which have some weathering damage on top.
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.
Resurface stained or cracked concrete window sills with new concrete.
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.
Your sill probably isn t this fancy.
At one spot there is a circa 10cm by 6cm section where the concrete is crumbling away to depth of maybe 1cm in the middle of the area.