A reduction in quality can be often equated to the strength of the flooring material and thus the link to mass and concentrated loads. Container operators are reporting increasing damages to the floors especially near the doors where fork trucks ‘land’ from loading ramps. The wheels of fork trucks constitute concentrated loads in this instance and repeated movements into and out of the container constantly stress the plies of the flooring material. Over its lifetime, a 40ft container regularly used for pallets or cargoes packed and unpacked by fork truck can experience nearly 5,500 loaded movements across the threshold