If you intend to store WPS composite decking prior to installation, it should be stored indoors in polythene wrap. If items are to be stored outside then they should be properly sheltered to prevent direct interference from sunlight, rain, moisture etc. The product must be close stacked in the shade, clear of the ground on levelled bearers (100mm), they should be stored on a level surface such as a concrete floor. Products need to be stored in a manner that prevents sagging and permits free air circulation.