Each year, American construction workers sustain approximately two hundred thousand injuries that are serious enough to cost them at least one day of work. This number leads all fields of endeavor, representing almost ten percent of all workplace injuries. In examining these accidents and their frequency, most studies look to the mechanism of the occurrence, most prominently the fatal four: falls from heights, strikes from objects, being crushed between objects, and electrical shocks. Combined, these types of accidents cause six of every ten fatal construction workplace accidents. Less frequently considered are the materials involved in construction accidents.