There are five commonly used procedures for designing industrial floor slabs. All of them are effective when their recommendations and details are followed. So, how does a designer choose the best method for a particular floor? The most common approach is to determine the type of floor construction needed for expected loading conditions. Then select the most appropriate method for determining floor thickness, reinforcement, joint spacing, and other details. ACI 360.1R-92 describes six common types of floor slab construction. The primary differences between each type are reinforcement details and joint spacing. Except for Type F slabs, all slabs are expected to remain essentially uncracked under applied loads: * Type A, plain concrete slab. * Type B, slab with shrinkage-control reinforcement. * Type C, slab with shrinkage-compensating concrete. * Type D, slab post-tensioned for crack control. * Type E, lightly reinforced structural slab. * Type F, structurally reinforced slab.