Concrete walks and flatwork should not obstruct free flow of surface water. Separations between building and exterior concrete slabs, and joints between exterior concrete slabs should be caulked using a flexible caulk designed for exterior use. Cracks in exterior concrete slabs should be repaired by epoxy injection. After the remedial construction has been completed it takes a long time for the soil to establish a new equilibrium, and for the structure to adjust to the improved condition. Ideally, cosmetic work and even some structural repair of cracks in walls and foundations should not be started before the structure is finally stabilized, which may take over a year.
All structures are subject to cyclic movements during the year.
Therefore cracks have a tendency to recur and can rarely be totally eliminated. Consultation with a registered civil engineer, knowledgeable about expansive soils as well as drainage systems, is recommended when problems are encountered. Consulting Engineers 1997 Hillside Buildings Civil Engineering vs. Geology Cracking in Residential Concrete Slabs Levelness in Residential Concrete Slabs Go to the top of the page.