My concrete sidewalks are an inch or so below grade (presumably sunken since installation by previous owners?) and are beginning to crack. I'd like to install flagstone pathways in their place. It looks like, in general, laying stone over existing concrete is acceptable. It also looks like I can use 1/2" of sand and 1" thick stone to get the walkaway about 1/2" above grade which seems suitable.
In addition to aesthetics, I'm interested in replacing the walkway with stone for long term durability. Will the pathway be as durable laid over existing concrete as it would be if I demolished the concrete and installed it more conventionally?