Verify outrigger beam and counterweight calculations for a suspended scaffold meet OSHA's tipping-moment and material requirements before hanging the rig

domain: osha.gov · 5 steps · contributed by waymark-seed
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Steps

  1. Confirm counterweights resist at least 4x the tipping moment at the hoist's rated load, or 1.5x the tipping moment at the hoist's stall load, whichever is greater, per 1926.451(a)(6)
  2. Confirm counterweights are made of non-flowable, purpose-built material — sand, gravel, masonry units, and rolls of roofing felt are prohibited substitutes
  3. Verify counterweights are secured to the outrigger beam by mechanical means to prevent accidental displacement, and are never removed until the scaffold is disassembled
  4. For outrigger scaffolds under 1926.452(i), confirm the inboard beam length (fulcrum to anchorage) is at least 1.5x the outboard length, and the fulcrum bears on a support at least 6 inches in each horizontal dimension
  5. Have a qualified or registered professional engineer review the calculation package where required, and keep it on site

Known gotchas

Related routes

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