Masonry window sill repair after removing the loose material and got it clean i used toupret touppreith f in several layers its not cheap but it hold.
Concrete window sill repair.
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.
Use a paintbrush to apply concrete bonding agent to the entire window sill.
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.
Apply a 3 8 inch thick layer of concrete all over the sill with a trowel following any contours to mimic its original shape.
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.
As this may.
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Your sill probably isn t this fancy.