It is best to site a container on a dry level surface such as concrete, tarmac or paving but this is not always possible. It follows that a damp, soft and uneven surface is the worst type of surface. It is most important that the surface is level so that the doors open and close correctly. The weight of a shipping container is borne through its corners and therefore spacers such as paving stones or timbers can be placed under the corners to level the container even on very uneven ground where different numbers of paving stones or timbers can be used for each corner. Shipping containers are very versatile and are of very strong construction and will sit satisfactorily even on non-ideal surfaces such as grass for many years.