Hello all, I do alot of rock walls and retaining walls etc but I have never done a patio. I have a customer that I am doing a decorative wall using Nicolock colonial wall stone and caps. the problem is that they have a HUGE patio that is about 2 years old and the edges are collapsing and cracking at the mortar. the patio is about 4000sq ft and is made of interlocking pavers. the field is OK, just the edges need to be re-done. is there anyone who can help me out with the best solution to fix this problem?