Buyers Guide to Cantilever Racks &amp; Lumber Storage Racking - Cantilever racks (also referred to as lumber racks) are cantilevered-style storage shelving that is specifically designed for storing long and bulky materials such as lumber, plywood, PVC and metal or bar stock pipes. For this reason, cantilever storage racks are many warehouse professionals top storage solution for storing items such as furniture, boats, steel bar stock, pvc pipe &lt;more&gt;