Resurface stained or cracked concrete window sills with new concrete.
Concrete window sill repair.
As this may.
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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.
Apply a 3 8 inch thick layer of concrete all over the sill with a trowel following any contours to mimic its original shape.
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.
Your sill probably isn t this fancy.
Repair concrete window sills hi i have a concrete window sills which have some weathering damage on top.
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.