It isn't standard practice to core slabs as a means of measuring thickness for acceptance testing. However, when cores are taken for another reason, slab thickness can become an issue if the core length indicates that the thickness is less than the design value.

When a designer specifies a given floor thickness, how close to the design value can the contractor reasonably be expected to get? Concrete Construction asked floor consultants Armand Gustaferro, Mount Prospect, Ill., and Eldon Tipping, Structural Services Inc., Dallas, for their views.