Specific Requirements of Welded Frame and Suspended Scaffolds

Supported Scaffold (Tubular Welded Frame)

  • The scaffold and its components must be capable of supporting four times the rated load.
  • Cross-braces of the proper length must be used to ensure that the scaffold will remain plumb and rigid.
  • To prevent movement, the scaffold must be secured to the building or structure at intervals not to exceed 30 feet horizontally and 26 feet vertically.
  • Outriggers must be used on narrow frame type scaffolds (i.e. Baker, Perry, Bil-Jax) whenever frames are stacked more than one section high.
  • Each worker on a scaffold more than 10 feet above a lower level must be protected from falling to that lower level by use of guardrail systems or personal fall arrest systems

Mobile Scaffolds

  • Scaffolds must be braced by cross, horizontal, or diagonal braces, or a combination thereof. Scaffolds must be plumb, level, and squared. All brace connections must be secured.
  • Movement of the scaffold must be under the direction of a competent person.
  • Scaffold should not be occupied while moving unless a competent person has determined it is safe to do so.
  • Rolling scaffold must not be used on sloped surfaces.
  • Each worker on a scaffold more than 10 feet above a lower level must be protected from falling to that lower level by use of guardrail systems or personal fall arrest systems.

Swinging Stage Scaffolds (Two-Point Suspension)

  • The platform of a two-point suspension scaffold must not be more than 36 inches wide unless designed by a qualified person, and must be surrounded with a standard guardrail and toe board.
  • Ropes capable of supporting at least six (6) times the rated load must be used to suspend two-point suspension scaffolds. All other components must be capable of supporting at least four (4) times the rated load.
  • The use of repaired wire rope is prohibited.
  • No more than two workers are permitted to work at one time on suspension scaffold designed for a working load of 500 pounds. No more than three workers are permitted to work at one time on suspension scaffolds with a working load of 750 pounds.
  • Each worker on a suspended scaffold must be protected by a personal fall arresting system attached to an independent lifeline. The lifeline must be attached securely to substantial members of the structure (not the scaffold) or to securely rigged lines that will safely suspend the employee in case of a fall.
  • Tiebacks must be secured to a structurally sound anchorage on the building or structure.
  • Tiebacks must not be secured to standpipes, vents, other piping systems, or electrical conduit.
  • A single tieback must be installed perpendicular to the face of the building or structure. Two tiebacks installed at opposing angles are required when a perpendicular tieback cannot be installed.
  • Independent lifelines should be protected from abrasion and wear.
  • Only those items specifically designed as counterweights must be used. Sand, gravel, masonry units, rolls of roofing felt, and other such materials shall not be used as counterweights.
  • Counterweights used for suspended scaffolds shall be made of materials that cannot be easily dislocated.
  • Counterweights shall be secured by mechanical means to the outrigger beams.

Boatswain's Chair and Ladder Jack

  • Each worker 10 feet (3.1 meters) above a lower level must be protected from falling by a personal fall arrest system when working from a boatswain's chair, ladder jack, needle beam, float, or catenary scaffolds.