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Require a concrete repair mortar or a concrete patch.
If the damage is deep, apply the mortar in several thinner layers, allowing each layer to set slightly before adding the next. This prevents cracking. Step 4: Shape and Profile repair concrete window sill
Visual and physical inspection revealed the following defects: Require a concrete repair mortar or a concrete patch
The good news is that you can yourself, saving hundreds on professional masonry repairs. repair concrete window sill
You cannot reach the window safely, especially on upper floors.
The damage involves deep structural structural issues with the brickwork below the window.
For an insightful look into concrete window sill repair, the most comprehensive technical paper is "