Composite decking has a long lasting life with a minimum of care and maintenance. It is a composite material of bamboo fiber and plastic but with no preservative chemicals to worry about, and no splinters that can cause painful slivers.You can clean your Composite deck occasionally with a detergent or deck cleaner, a brush, and a hose to keep it looking fresh.The span can be up to 300mm between joists for perpendicular application. We would recommend 250mm for a strong and solid deck.