Concrete contractors are frequently plagued by the problem of cracks. Assuming that cracks cannot be completely eliminated, the question arises as to the contractor's liability. Contractors need to be aware that the basic rule of implied warranty of fitness applies to them. Many contractors incorporate into their proposal forms quite specific disclaimers of implied warranties. Such disclaimers are intended to minimize potential liability. They do not, however, relieve the contractor of the obligation to perform the contract in a professional manner. In the long run, everyone is better off if the work is done in such a way as to prevent the occurrence of cracks. If the customer is properly sold in advance on the desirability of putting down a sand base and using reinforcing, he will usually not object to the greater cost which results. When he definitely rejects such measures, the terms of the contract should indicate this fact so that the omission cannot become a future issue.