To develop sufficient restraint at an unpaved border, the edge must penetrate the earth to a depth that will force the adjacent ground to act as a berm. This is typically accomplished through the use of a curb of pavers on end, a continuous metal strip or a continuous, poured concrete strip.
The force offered by the edge restraining must be transferred from one level to another. This is best accomplished through a gentle curving of the units from one level to another or the use of a curb for abrupt changes in level. The curb for the abrupt changes must be stiff enough and deep enough to resist any rotation due to the lateral forces induced by the adjacent paved surface at different levels.
When paving up to a building, edge restraint occurs naturally the vertical walls of the building. At this junction, pavers must conform to the shape of the building at the pavement level and the lateral force developed within the plane of the paved surface will be resisted by the building mass.