#18 Scaffolds

A selection of Orders from Title 8, Article 21, §1635 – §1648

  • Scaffolds shall be constructed of wood or other suitable materials such as steel or aluminum members of known strength characteristics.
  • Anchorage and bracing shall be such that scaffolds and falsework will be prevented from swaying, tipping, or collapsing.
  • Scaffold lumber, except for planks, used on suspended or ladder-jack scaffolds, shall be the equivalent of “selected lumber,” free from damage that affects its strength. (See definitions for lumber specifications.)
  • Except as specified in other Orders, all planking shall be at least equivalent to 2-inch x 10-inch (nominal) lumber selected for scaffold grade plank as defined in Section 1504, Lumber – “Structural Plank”.
  • All planks shall be capable of safely sustaining the intended load.
  • Except as specified in other Orders, a scaffold plank shall not overhang its support by more than 18 inches, unless access to this overhanging portion is prevented by a guardrail, or other barrier, or unless the other plank end is securely anchored.
  • Inspection of Lumber. All scaffold lumber shall be visually inspected for defects before and during use. Defective lumber shall not be used.
  • All nailed joints in scaffolds and wooden falsework must contain enough properly placed nails of ample size to carry the loads they are intended to support. No nail smaller than 8-penny shall be used in the construction of scaffolding. All nails shall be driven full length or to the first head when double-headed nails are used.
  • Open sides and ends of intermediate working levels 7 1/2 feet or more above grade shall be guarded by a 2-inch by 4-inch top rail nailed to the uprights so that the top edge is between 42 inches and 45 inches above the platform. Midrails of at least 2-inch by 4-inch material are required at all work levels. The uppermost platform shall be protected by a top rail consisting of double 2-inch by 4-inch members. One member shall be fastened in a flat position on top of the uprights and the other member shall be fastened in an edge-up position to the inside of the uprights and at the side of the top member. A single 2-inch by 4-inch member having an allowable bending stress of at least 1,900 psi may be used as a top rail. NOTE: This standard applies to “Light-Trades” – carpenters, lathers, shinglers, painters, plasterers, sheet metal workers, or other trades not using heavy tools or storing heavy materials on the scaffolds.