Around here (central NC), most garage foundation are built with 4" brick/4" CMU or 4" brick/8"CMU. The stud walls generally bear on the brick portion. Yeah, I know this is not ideal, but this is how it is done and it seems to work fine. Unfortunately, this is at odds with the IRC as far as stem walls under braced wall panels go. See the attached drawing. The upper detail is from the IRC and shows the brick as a water table with the studs bearing on the reinforced CMU. The lower details are how it is normally built. The field inspectors do not know this portion of the code well so this gets swept under the rug in almost all cases. The Architects and Builders do not want a water table detail. Does anyone have any suggestions how to build a stem wall that meets the needs of both the IRC and the Arch/Builders?
In some cases I have used a 2x8 stud wall and busted out the face of the 8" CMU top course to get some anchor bolt purchase (also shown on drawing)
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