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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.
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.
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.
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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.
Your sill probably isn t this fancy.
Use a paintbrush to apply concrete bonding agent to the entire window sill.
Repair concrete window sills hi i have a concrete window sills which have some weathering damage on top.