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Roofers laying a tiled roof in Denver, Colorado A German roofer installing a reed roof, wearing the traditional vest and trousers of a craftsperson. A roofer, roof mechanic, or roofing contractor is a tradesman who specializes in roof construction.
A safety barrier is a component which prevents passage into a dangerous area. It is commonly used to mitigate risk in the Hazard-Barrier-Target model, as studied in safety science.