Omni Block stretcher and corner/jamb block meet ASTM C-90 Standard Specification of Loadbearing Concrete Masonry Units (CMU) and exceeds all minimum requirements as set forth in the ASTM C-140 Standard Test Methods for Sampling and Testing. These two tests are nationally recognized as the fundamental tests that standard CMU must pass to be considered a structural block. Therefore, the Omni Block stretcher and corner/jamb block are in the same classification as standard CMU. The above linked reports provide actual test results for the compressive strengths of Omni Block units.
Consider that there are over 100 variations of CMU and all must pass the ASTM C-90 and C-140 tests in order to be considered “structural”. None of these CMU require an ICC report, rather all are engineered using The Masonry Society (TMS) standard tables. The same is true of the three 8″ or two 12″ Omni Block units.
A Complete Set of Stamped Engineering Calculations are included here to illustrate how structural engineers calculate rebar and grout requirements in the individual block units for Omni Block walls and lintel designs.
The detailed letter from an independent PE below provides an experienced assessment to assist those structural engineers that are unfamiliar with Omni Block.