Collection: Warning Line Flags

High-Visibility Warning Line Flags for Jobsite Perimeter Safety. Mark rooftop edges, open hazards, and restricted zones with durable warning line flags built for visibility and compliance. Our selection includes OSHA-style pendant flag lines, reusable warning line kits, and replacement flags ideal for commercial roofing, construction, and industrial safety. Up Side Down Supply delivers perimeter solutions that install fast and hold up in tough conditions.