Modern warehouse floors are among the most demanding structures built with concrete. They must be extremely durable to sand up under the constant battering of heavily loaded wheeled vehicles, virtually crack-free and level within the very narrow tolerances demanded by modern automated material-handling equipment. Since a single project may involve many acres of such construction, initial costs are bound to be substantial and owners therefore have every right to demand and expect that even with the hardest usage maintenance costs will be within acceptable limits. Following is a set of procedures that has been used successfully. Minimization of construction joints and sawed joints and elimination of random shrinkage cracks are among the prime design objectives. One approach is to use shrinkage-compensating cement and welded wire fabric placed 2 inches from the top of the floor. This practice will substantially reduce the number of construction joints and sawed joints, and will also increase the size of the sections that can be cast. Better floor surfaces are thus assured. A key factor in getting the floor to perform as desired is to position the welded wire fabric correctly within the concrete. For a floor 6 inches thick, 4 inches of concrete should be placed, then the welded wire fabric is laid down before placing the final 2 inches of concrete. A still better method of getting the correct placement is to support the fabric up off the subbase. Many of the techniques described briefly in this article have been developed over the years by J. C. Penney as a result of experience in building and maintaining its own warehouses. The company has abundant evidence that additional care and expense put into the original construction of the warehouse floors pay off handsomely in terms of performance, long life and minimal maintenance.