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Workers inspecting a flat rooftop with skylights and vents at dusk or dawn.
Workers on a flat commercial roof installing or repairing a roofing system at dusk, with vent pipes and skylights visible.
Worker kneeling and measuring a square opening in a concrete floor on a rooftop, with tools and wiring inside the opening.
Workers in bright vests working on a flat rooftop, installing roofing materials with city buildings in the background.