Most concrete damage comes from water, salt and freeze-thaw working on a weak base. The fix depends on why it failed, not how bad it looks.
Usually worth repairing
- Hairline cracks that are not moving
- Surface scaling on otherwise solid steps or slabs
- Small chipped corners and edges
Usually time to replace
- Slabs that have sunk or heaved
- Cracks that keep widening or have one side higher than the other
- Steps that have pulled away from the house
- Damage across most of the surface
A patch over a moving base cracks again. If the base is the problem, the honest answer is a replacement, built properly this time.
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