Home Renovations Interlock Paving - It Was Good Enough For The Roma | Page 9

This is why using sand is much better than mortar as the sand performs the interlock which
provides the entire structure with tremendous strength and stability. It is this interlock
function that allows pavers that are not actually physically touching along their entire
surface to remain stable and highly resistant to movement even when strong forces are
applied such as a car accelerating on a driveway. But the interlock also provides along with
formidable strength great flexibility. This is due again to the gap and the sand within the gap
allowing the stones in summer or winter to bend or flex as there is no actual solid structure.