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Scaffolding eTool

Supported Scaffolds Specialty and Other Scaffolds

Specialty and Other Scaffolds

Many scaffold types regulated by OSHA standards are rarely used, and designed for a very narrow and specific range of applications. Requirement for these specialty scaffolds are addressed on this page.

NOTE: The requirements on this page are specific only to the specialty scaffolds listed below. For requirements that apply to all types of supported scaffolds, please refer to the Frame or Fabricated module of this eTool.

Plasterers', Decorators', and Large-Area Scaffold

Plasterers', Decorators', and Large-Area Scaffold

General Requirements:

Scaffolds shall be constructed in accordance with the following paragraphs of this section, as appropriate [29 CFR 1926.452(d)]:

  1. Pole scaffolds
  2. Tube and coupler scaffolds
  3. Fabricated frame scaffolds

Non-mandatory Guidelines:

The guidelines for pole scaffolds, 29 CFR 1926 Subpart L Appendix A(2)(a), or tube and coupler scaffolds, 29 CFR 1926 Subpart L Appendix A(2)(b), may be applied. [29 CFR 1926 Subpart L Appendix A(2)(d)]

Bricklayers' Square Scaffold

Bricklayers' Square Scaffold

General Requirements:

  • Scaffolds made of wood must be reinforced with gussets on both sides of each corner. [29 CFR 1926.452(e)(1)]
  • Diagonal braces must:
    • Be installed on all sides of each square. [29 CFR 1926.452(e)(2)]
    • Be installed between squares on the rear and front sides of the scaffold.
    • Extend from the bottom of each square to the top of the next square. [29 CFR 1926.452(e)(3)]
  • Scaffolds must [29 CFR 1926.452(e)(4)]:
    • Be constructed and arranged so that one square rests directly above the other.
    • Not exceed three tiers in height.
  • The upper tiers must [29 CFR 1926.452(e)(4)]:
    • Stand on a continuous row of planks laid across the next lower tier.
    • Be nailed down or otherwise secured to prevent displacement.

Non-mandatory Guidelines:

Maximum Intended Load 50 pounds/foot2 †
Maximum Width 5 feet
Maximum Height 5 feet
Gussets 1 x 6 inches
Braces 1 x 8 inches
Legs 2 x 6 inches
Bearers (horizontal members) 2 x 6 inches
The squares shall be set not more than 8 feet apart for light duty scaffolds and not more than 5 feet apart for medium duty scaffolds. [29 CFR 1926 Subpart L Appendix A (2)(e)]
Horse Scaffold

Horse Scaffold

General Requirements:

Non-mandatory Guidelines:

Maximum Intended Load (light duty) 25 pounds/foot2 †
Maximum Intended Load (medium duty) 50 pounds/foot2 †
Bearers (light duty) 2 x 4 inches
Bearers (medium duty) 3 x 4 inches
Legs 2 x 4 inches
Longitudinal Bracing Between Legs 1 x 6 inches
Gusset Braces at Top of Legs 1 x 8 inches
Half Diagonal Braces 2 x 4 inches
Horses shall be spaced not more than 8 feet apart for light-duty loads, and not more than 5 feet apart for medium-duty loads. [29 CFR 1926 Subpart L Appendix A (2)(f)]
Form Scaffold and Carpenters' Bracket Scaffold. Arrow points to where it is hooked over form supports.

Form Scaffold and Carpenters' Bracket Scaffold

General Requirements:

  • Each bracket, except those for wooden bracket-form scaffolds, must be attached to the supporting framework or structure by one or more of the following [29 CFR 1926.452(g)(1)]:
    • Nails
    • A metal stud attachment device
    • Welding
    • Hooking over a secured structural supporting member, with the form wales either:
      • Bolted to the form
      • Or secured by snap ties or tie bolts extending through the form.
      • Securely anchored
      • Or (for carpenters' bracket scaffolds only) by a bolt extending through to the opposite side of the structure's wall.
  • Wooden bracket-form scaffolds must be an integral part of the form panel. [29 CFR 1926.452(g)(2)]
  • Folding-type metal brackets, when extended for use, must be either [29 CFR 1926.452(g)(3)]:
    • Bolted
    • Secured with a locking-type pin

Non-mandatory Guidelines:

Wooden Figure-Four Scaffolds
[29 CFR 1926 Subpart L Appendix A (2)(g)(5)]
Maximum Intended Load 25 pounds/foot2
Uprights 2 x 4 inches or 2 x 6 inches
Bearers (two) 1 x 6 inches
Braces 1 x 6 inches
Maximum Length of Bearers (unsupported) 3 feet 6 inches
Metal Bracket Scaffolds
[29 CFR 1926 Subpart L Appendix A (2)(g)(6)]
Maximum Intended Load 25 pounds/foot2
Uprights 2 x 4 inches
Bearers As designed
Braces As designed
Wooden Bracket Scaffolds
[29 CFR 1926 Subpart L Appendix A (2)(g)(7)]
Maximum Intended Load 25 pounds/foot2
Uprights 2 x 4 inches or 2 x 6 inches
Bearers 2 x 6 inches
Maximum Scaffold Width 3 feet 6 inches
Braces 1 x 6 inches
Roof Bracket Scaffold

Roof Bracket Scaffold

General Requirements:

  • Scaffold brackets must be constructed to [29 CFR 1926.452(h)(1)]:
    • Fit the pitch of the roof.
    • Provide a level of support for the platform.
  • Brackets must be anchored in place by nails unless it is impractical to use nails. [29 CFR 1926.452(h)(2)]
  • When nails are not used, brackets must be secured with first-grade manila rope of at least ¾-inch diameter, or equivalent. [29 CFR 1926.452(h)(2)]
Outrigger scaffold

Outrigger scaffold

General Requirements:

  • Outrigger beams must be [29 CFR 1926.452(i)(4)]:
    • Secured in place to prevent movement.
    • Securely braced at the fulcrum point to prevent tipping.
  • The inboard end of outrigger beams must be:
    • Not less than 1½ times the length of the outboard end, measured from the fulcrum point to the extreme anchorage point. [29 CFR 1926.452(i)(1)]
    • Securely anchored either by [29 CFR 1926.452(i)(5)]:
      • Braced struts bearing against sills in contact with the overhead beams or ceiling.
      • Tension members secured to the floor joists underfoot.
      • Or both
  • The fulcrum point of outrigger beams must rest on secure bearings at least 6 inches in each horizontal dimension. [29 CFR 1926.452(i)(3)]
  • Outrigger beams fabricated in the shape of an I-beam or channel beam must be placed so that the web section is vertical. [29 CFR 1926.452(i)(2)]
  • The entire supporting structure must be securely braced to prevent any horizontal movement. [29 CFR 1926.452(i)(6)]
  • To prevent their displacement, platform units must be [29 CFR 1926.452(i)(7)]:
    • Nailed
    • Bolted or
    • Otherwise secured to outriggers
  • Scaffolds and scaffold components must be [29 CFR 1926.452(i)(8)]:
    • Designed by a registered professional engineer.
    • Constructed and loaded in accordance with that design.
Window Jack Scaffolds - Arrows point out the position of the building structure, anchor (at the base of the window), and the window opening.

Window Jack Scaffolds

General Requirements:

  • Scaffolds must be securely attached to the window opening. [29 CFR 1926.452(l)(1)]
  • Scaffolds must be used only for working at the window opening through which the jack is placed. [29 CFR 1926.452(l)(2)]
  • Window jacks must not be used to support planks or other elements of scaffolding placed between one window jack and another. [29 CFR 1926.452(l)(3)]

Non-mandatory Guidelines:

Crawling Board (Chicken Ladder) placed on a roof

Crawling Board (Chicken Ladder)

General Requirements:

  • Crawling boards must extend from the roof peak to the eaves when used in roof construction, repair, or maintenance. [29 CFR 1926.452(m)(1)]
  • Crawling boards must be secured to the roof by [29 CFR 1926.452(m)(2)]:
    • Ridge hooks
    • Or by means that provide equivalent strength and durability.

Non-mandatory Requirements:

Step, Platform, and Trestle Ladder Scaffold

Step, Platform, and Trestle Ladder Scaffold

General Requirements:

  • Scaffold platforms must be placed no higher than the second-highest rung or step of the ladder supporting the platform. [29 CFR 1926.452(n)(1)]
  • All ladders used in step, platform and trestle ladder scaffolds must:
  • Scaffolds must not be bridged one to another. [29 CFR 1926.452(n)(4)]
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