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California Slabs


Ribbed Slabs ] Mat Slabs ] [ California Slabs ]

The California Slab design was developed in the San Diego area of California hence the name.  The purpose was to provide a simplified design approach based on span capacity for use on 1 and 2 story residential foundations over low to medium expansive soils, typically with an expansion index =/< 20 (UBC 29-3).  When the geotechnical and post-tensioning engineers agree along with the building official, it can also be used over soils with an expansion index of up to 50.

Empirical in its approach,  this "spanability" design is characterized by a typically 5 inch thick slab with integrally cast, turned down edges for both moisture cutoff and perimeter rigidity.  Interior concrete may be thickened where necessary to accommodate excessive structural loads and/or overturning moments from shear walls.  Often this can result in significantly deepened, monolithically cast grade beams with additional mild steel reinforcement.



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