Equipment used for climbing should not be placed over, or immediately next to, hard surfaces not intended for use as surfacing for climbing equipment. All pieces of playground equipment should be placed over a shock-absorbing material that is either the unitary or the loose-fill type extending beyond the perimeter of the stationary equipment. Organic materials that support colonization of molds and bacteria should not be used. This standard applies whether the equipment is installed outdoors or indoors. Programs should follow CPSC guidelines and ASTM International Standards F1292-13 and F2223-10.