Understanding Commercial Roofing Contractor Incidence Rates

May 27, 2014

Aside from ongoing safety programs initiated by a roofing contractor, there are several statistics that can help you evaluate the safety of prospective contractors. These numbers reveal the company’s safety performance history.

Total Incidence Rate (TIR)

TIR is an equation that calculates the number of recordable injuries and/or illnesses that a contractor experiences in a year per 100 full-time employees. This key safety metric is often used by companies to track the success of their own safety improvements and effectiveness of safety programs against the national average released by the U.S. Department of Labor’s Bureau of Labor Statistics.

Lost Workday Incidence Rate (LWDIR or LWIR)

This statistic is similar to TIR, except that it uses the number of injuries and/or illnesses resulting in lost workdays or restricted work activity. Both TIR and LWIR are reported by the Bureau of Labor Statistics of the U.S. Department of Labor annually.

Experience Modification Ratio (EMR)

Developed by the insurance industry to determine premiums for workers’ compensation insurance, EMR is considered a good indicator of a contractor’s past safety record. A calculation predicts the amount of anticipated losses to be paid by the contractor in a designated rating period, taking into account a number of variables. When the expected losses are compared to the actual losses, an experience rating results. A lower EMR indicates that the contractor had fewer and/or less serious incidents than what was expected.

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