When the stones are all placed, interlocking sand secures the hardscape. Interlocking pavers will not crack with shrinkage or ground movement because it is not a single material unit, it allows for flexibility. Pavers also allow for sections to be repaired should the ground move or the pavers get damaged.
For example, if your interlocking paver patio lifts or shifts over time due to the roots of a tree, you can remove the pavers in the affected area, remove the roots and replace the same pavers, without replacing the entire patio.
Interlocking paver hardscapes have a greater weight bearing load than concrete (concrete weight capacity is generally sufficient for nearly all residential applications).
We are experts in interlocking paver installation. There are multiple paver stone suppliers to pick your product from, we recommend Calstone and Belgard products.