Actually the procedures for both the design the construction of a conventional slab-on-grade are fairly uncomplicated. The structural design has been reduced to simple charts to cover most applications. Usually the determinant in the success or failure of a floor is the care and skill exercised in ordering the concrete and in placing, finishing, and curing it. Correct timing of all the steps in floor construction is vital both to the quality of the finished floor and to efficient, profitable use of manpower on the jobsite. Here is a guide to the basic steps in building an ordinary slab-on-grade concrete floor. Do consult with your ready mix supplier to arrange scheduling of concrete delivery, especially if two or more truckloads are involved. Do throughly compact and drain the subgrade. Its density is non-uniform, pior to subsequently settles or heaves appreciably, serious cracking or the slab is likely to occur. Do build formwork that will not leak grout or mortar from the concrete placed against it; coat or wet wooden contact surfaces to minimize their absorption of concrete mix water. Do bring the temperature of reinforcement to the level of concrete temperature. It the reinforcement is hot or coated with ice, bond of concrete to steel will be reduced. Don't lay reinforcement on the subgrade ... it will serve no purpose there. Reinforcement must be positioned at the correct level in the slab for it to add structural strength or resist thermal cracking. Don't add water to the mix when it is delivered. If the concrete is below the specified slump or lacks workability or finishability, consult with your ready mix supplier. Don't use a jitterbug except on unusually low slump concrete. Its use on concrete of more than 1 inch slump results in depressing the large aggregates below the surface leaving a weak film of water and sand. Finally, don't permit traffic on floor slabs until they have been air dried a few days, if moist curing has been utilized. This is not necessary when a curing compound is used.