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Parts of a concrete walkway leading up to the front of the house have sunk down over the years. We want to add a layer of new concrete over the old concrete to raise it and make it more even. What is the minimum thickness we can pour to not compromise the strength?

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If you are going to put 3" down you would be better served to do a new walkway. Have you looked into "slabjacking" or "mudjacking" to raise your old slabs. Might be cheaper if the surface of your old slabs is still in good shape.

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  • We are aware of this process, but in addition to the sinking sidewalk it also looks very worn, so we were wanting to give it a 'facelift'.
    – RET
    May 22 '15 at 17:48

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