SPRI has published a detailed Bulletin that includes recommendations for the design and contractor communities on important changes recently made to FM Approvals (FM) Standard 4470.
Let’s define a roof fall as any unarrested free-fall of an employee originating from a roof deck launch point and resulting in a terminal impact with the ground or an impeding structure (like a lower roof). Like any other falling object, a fall victim will accelerate at 32 feet/second2.