Sheet Metal & Air Conditioning Contractors’ National Association

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Hanger Straps Embedded in Concrete Test Results

The SMACNA Testing and Research Institute (STRI) completed load tests on three different combinations of strap embedded in concrete. The test specimens included (A) 16 ga x 1 inch wide double coil hanger strap embedded flush with the bottom of the concrete surface; average concrete compressive strength was 3,650 psi; (B) 16 ga x 1 inch wide double coil hanger strap embedded 1 inch from the bottom of the concrete surface; average concrete compressive strength was 3,600 psi; and (C) 16 ga x 1 ½ inch wide double coil hanger strap embedded 1 inch from the bottom of the concrete surface; average concrete compressive strength was 3,850 psi. Figure 1 shows the test configurations for the three types of test specimens.

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