What is a roofing warning line system?

OSHA Section 1926.501 defines a warning line as: a barrier erected on a roof to warn employees that they are approaching an unprotected roof side or edge, and which designates an area in which roofing work may take place without the use of guardrail, body belt, or safety net systems to protect employees in the area.

Roofing warning line systems are a method of fall protection for roofers. Construction companies must meet OSHA requirements (29 C.F.R) when warning lines are used to protect roofers from falling. A warning system is inexpensive, keeps workers safe and roof companies in compliance.

Warning line systems consist of ropes, wires, or chains, and supporting stanchions and are set up as follows:

  • Flagged at not more than 6-foot (1.8 meters) intervals with high-visibility material;
  • Rigged and supported so that the lowest point (including sag) is no less than 34 inches (0.9 meters) from the walking/working surface and its highest point is no more than 39 inches (1 meter) from the walking/working surface.
  • Stanchions, after being rigged with warning lines, shall be capable of resisting, without tipping over, a force of at least 16 pounds (71 newtons) applied horizontally against the stanchion, 30 inches (0.8 meters) above the walking/working surface, perpendicular to the warning line and in the direction of the floor, roof, or platform edge;
  • The rope, wire, or chain shall have a minimum tensile strength of 500 pounds (2.22 kilo-newtons) and after being attached to the stanchions, must support without breaking, the load applied to the stanchions as prescribed above.
  • Shall be attached to each stanchion in such a way that pulling on one section of the line between stanchions will not result in slack being taken up in the adjacent section before the stanchion tips over.
  • Warning lines shall be erected around all sides of roof work areas. When mechanical equipment is being used, the warning line shall be erected not less than 6 feet (1.8 meters) from the roof edge parallel to the direction of mechanical equipment operation, and not less than 10 feet (3 meters) from the roof edge perpendicular to the direction of mechanical equipment operation.
  • When mechanical equipment is not being used, the warning line must be erected not less than 6 feet (1.8 meters) from the roof edge.

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RACE Perimeter Warning Flags
Meets OSHA Compliance Standard (yellow, HD, Red, Multi-Colored)
Price: Choose Flag
Availability: In Stock
RACE

    Standard: 105 ft.long Increases visibility of hazardous areas 18" x 12" HDPE Triangle Flags (3 Mil) Flags are spaced 22" apart 500 lb. OSHA compliant break strength Compliant with EM385-1-1 Standards 12/box, 48/case Heavy Duty: 105 ft.long Increases visibility of hazardous areas 18" x 12" HDPE Triangle Flags (6 Mil) Flags are spaced 22" apart 500 lb. OSHA compliant break strength Compliant with EM385-1-1 Standards Heavy Duty material (6 mil) last longer than standard warning line flagsPennants...

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    RACE Roofing Warning Line System, 30 lb. Base & Cone
    OSHA Compliant, ships FREE! Minimum order of 20 required
    Price: $49.95
    Availability: In Stock
    RACE Item #: RACE-WL-OSHA -

      RACE Roofing Warning Line System, 30 lb Recycled Rubber Base & 43" Safety Cone Designed To Meet OSHA 1926.502 (39" OSHA Maximum Tie-Off Height) The RACE Roof Warning Line System Cones feature an ergonomic handle for easy carrying. The smooth cone shape allows easy stacking for transportation and storage. Our cones are made of low-density polyethylene plastic for increased durability in all weather conditions. The 30 lb rectangular-shaped base is made of recycled rubber and features a smooth...

      Tie Down 65002 Folding Warning Line System
      Set of 4 Stanchions w/Flagging (33 ft. Spacing)
      Price: $675.00
      Availability: In Stock
      Tie Down Engineering Item #: TDE-65002 -

        Help protect workers from dangerous areas around jobsite or roof. Includes 4 Stanchions and 105' of bright yellow pennants. This lightweight and compact warning line system is easier to set up and requires less storage space. Spring activated legs lock firmly into place, no lost poles or locking pins. Each stanchion has a built in handle for easier transporting to and from jobsite. 39" Folding Stanchions with Handles 105 ft. of Warning Legend Pendants Zinc Plated for Longer Life Spring...

        ACRO, #21000 X-Warning Line, Set of 4 w/flags
        OSHA compliant
        Price: $236.45
        Availability: In Stock
        Acro Building Systems Item #: WL-21000 -

          Designed for contractors the X-Warning line system is OSHA compliant and works on both roof and ground applications. Light weight yet sturdy, the steel X-Warning lines set up fast. Open the base, install the post and wrap the warning line! The X-Warning line ships in sets of 4 which include 130 feet of flagged warning line. Installation Instructions ...

          Folding Warning Line
          A Portable, Hand Carried Folding (Collapsible) Warning Line System, priced per stand
          Price: $152.00
          Availability: In Stock
          SPAR-Marathon Item #: WL-FOLDING-01 -

            A Portable, Hand Carried Folding (Collapsible) Warning Line System For Asphalt or Metal Roofs Complies with OSHA’s (Std-29 CFR)(1926.502) (f) Quick set up Priced per stand Recommended spacing: Every 50 ft. 34 lbs. per stand Uses: Rooftops, construction sites, parking lots, high rise construction, manufacturing facilities, maintenance contractors, office buildings, amusement parks, airports, warehouses ...

            Spar Marathon 06SRPWLSC Perimeter Warning Line System
            Stanchion easily slips out of the weighted base plate for easy transport and storage,...
            Price: $160.00
            Availability: In Stock
            SPAR-Marathon Item #: WL-PERIMETER-01 -

              Stanchion easily slips out of the weighted base plate for easy transport and storage For Asphalt or Metal Roofs Complies with OSHA’s (Std-29 CFR)(1926.502) (f) Quick set up Priced per stand Recommended spacing: Every 50 ft.Uses: Rooftops, construction sites, parking lots, high rise construction, manufacturing facilities, maintenance contractors, office buildings, amusement parks, airports, warehousesBase = 24" x 24" & 40 lbs. ...

              Guardian 15225 Folding Warning Line Single Stanchion
              Easy to store reusable warning line
              Price: $126.54
              Availability: In Stock
              Guardian Fall Protection Item #: GUA-15225 -

                The Guardian Fall Protection Single Stanchion is specially designed for use with a reusable warning line. An often overlooked option in the world of fall protection, warning lines and guardrail systems function to block worker from exposure to fall hazards, often entirely eliminating the need for other types of fall protection equipment. The Single Stanchion weighs only 23 pounds, is 39 inches tall, and is composed of powder-coated steel for superior durability and weather resistance. It is...

                Tie Down Standard Warning Line System 65001
                Price: $505.55
                Availability: In Stock
                Tie Down Engineering Item #: TDE-65001 -

                  Four 24” platforms with handles Four 38” line holders (stanchions) 100 ft. yellow flagging Hot dipped galvanized platforms and line holders for longer life FOB our warehouse

                  Guardian 15227 Goose Single Stanchion Warning Line
                  Spring loaded legs - no additional tools required
                  Price: $192.95
                  Availability: In Stock
                  Guardian Fall Protection Item #: GUA-15227 -

                    The Guardian Fall Protection Goose Single Stanchion is specially designed for use with a reusable warning line. An often overlooked option in the world of fall protection, warning lines and guardrail systems function to block workers from exposure to fall hazards, often entirely eliminating the need for other types of fall protection equipment. The spring loaded legs of the Goose Single Stanchion allow for a quick and easy installation, and its convenient handle facilitates simple...

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                    RACE Perimeter Warning Flags
                    Meets OSHA Compliance Standard (yellow, HD, Red, Multi-Colored)
                    Price: Choose Flag

                    Standard: 105 ft.long Increases visibility of hazardous areas 18" x 12" HDPE Triangle Flags (3 Mil) Flags are spaced 22" apart 500 lb. OSHA compliant break strength Compliant with EM385-1-1 Standards 12/box, 48/case Heavy Duty: 105 ft.long Increases visibility of hazardous areas 18" x 12" HDPE Triangle Flags (6 Mil) Flags are spaced 22" apart 500 lb. OSHA compliant break strength Compliant with EM385-1-1 Standards Heavy Duty material (6 mil) last longer than standard warning line flagsPennants...

                    Ships Free!
                    New!
                    RACE Roofing Warning Line System, 30 lb. Base & Cone
                    OSHA Compliant, ships FREE! Minimum order of 20 required
                    Price: $49.95

                    RACE Roofing Warning Line System, 30 lb Recycled Rubber Base & 43" Safety Cone Designed To Meet OSHA 1926.502 (39" OSHA Maximum Tie-Off Height) The RACE Roof Warning Line System Cones feature an ergonomic handle for easy carrying. The smooth cone shape allows easy stacking for transportation and storage. Our cones are made of low-density polyethylene plastic for increased durability in all weather conditions. The 30 lb rectangular-shaped base is made of recycled rubber and features a smooth...

                    Spar Marathon 06SRPWLSC Perimeter Warning Line System
                    Stanchion easily slips out of the weighted base plate for easy transport and storage,...
                    Price: $160.00

                    Stanchion easily slips out of the weighted base plate for easy transport and storage For Asphalt or Metal Roofs Complies with OSHA’s (Std-29 CFR)(1926.502) (f) Quick set up Priced per stand Recommended spacing: Every 50 ft.Uses: Rooftops, construction sites, parking lots, high rise construction, manufacturing facilities, maintenance contractors, office buildings, amusement parks, airports, warehousesBase = 24" x 24" & 40 lbs. ...

                    Guardian 15225 Folding Warning Line Single Stanchion
                    Easy to store reusable warning line
                    Price: $126.54

                    The Guardian Fall Protection Single Stanchion is specially designed for use with a reusable warning line. An often overlooked option in the world of fall protection, warning lines and guardrail systems function to block worker from exposure to fall hazards, often entirely eliminating the need for other types of fall protection equipment. The Single Stanchion weighs only 23 pounds, is 39 inches tall, and is composed of powder-coated steel for superior durability and weather resistance. It is...