Cores from the floor of our new warehouse show that it varies in thickness from 2 1/2 to 3 1/2 inches. A thickness of four inches was specified. Ought we to insist that the floor be taken out or a thick topping applied?
The floor is not only too variable but too thin. Even the original specification of four inches was too thin for a warehouse floor. Thicknesses of five to 20 inches may be required depending on wheel loadings. The chart in the ACI 302 Standard should be consulted. One method of repair is to grind or scarify the surface and apply a well bonded topping to bring the floor to the required thickness. Otherwise it should be torn out and replaced.