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  Specialty and Other Scaffolds
Specialty and Other ScaffoldsMany 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 Scaffolds
General Requirements Non-mandatory Guidelines
Plasterers', Decorators', and Large-Area Scaffold

Plasterers', Decorators', and Large-Area Scaffold



Bricklayers' Square Scaffolds
General Requirements
  • Scaffolds made of wood must be reinforced with gussets on both sides of each corner. [1926.452(e)(1)]

  • Diagonal braces must:

    • Be installed on all sides of each square, [1926.452(e)(2)]

    • Be installed between squares on the rear and front sides of the scaffold, and 

    • Extend from the bottom of each square to the top of the next square. [1926.452(e)(3)]
  • Scaffolds must:

    • Be constructed and arranged so that one square rests directly above the other, and 

    • Not exceed three tiers in height. [1926.452(e)(4)]
  • The upper tiers must:

    • Stand on a continuous row of planks laid across the next lower tier, and

    • Be nailed down or otherwise secured to prevent displacement. [1926.452(e)(4)]
Bricklayers' Square Scaffold

Bricklayers' Square Scaffold


Non-mandatory Guidelines

Maximum intended load 50 pounds/foot*
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 [1926 Subpart L Appendix A (2)(e)].


Horse Scaffolds
General Requirements
  • Scaffolds must not be more than 10 feet or two tiers in height, whichever is less. [1926.452(f)(1)]

  • When horses are arranged in tiers:

    • Each horse must be placed directly over the horse in the tier below, [1926.452(f)(2)]

    • The legs of each horse must be nailed down or otherwise secured to prevent displacement [1926.452(f)(3)], and

    • Each tier must be crossbraced. [1926.452(f)(4)]
Horse Scaffold

Horse Scaffold


Non-mandatory Guidelines

Maximum intended load (light duty) 25 pounds/foot*
Maximum intended load (med. duty) 50 pounds/foot*
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. [1926 Subpart L Appendix A (2)(f)]


Form Scaffolds and Carpenters' Bracket Scaffolds
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:

    • 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, and

      • Securely anchored; or

    • (for carpenters' bracket scaffolds only) by a bolt extending through to the opposite side of the structure's wall. [1926.452(g)(1)]
  • Wooden bracket-form scaffolds must be an integral part of the form panel. [1926.452(g)(2)]

  • Folding-type metal brackets, when extended for use, must be either:
Form Scaffold and Carpenters' Bracket Scaffold

Form Scaffold and Carpenters' Bracket Scaffold


Non-mandatory Guidelines
Wooden Figure-Four Scaffolds
[1926 Subpart L Appendix A (2)(g)(5)]
Maximum intended load 25 pounds/foot
Uprights 2 x 4 inches or 2 x 6 inches
Bearers (two) 1 x 6 inches
Braces 1 x 6 inches
Max. length of bearers (unsupported) 3 feet 6 inches
  • Bearers for wooden figure-four scaffolds must:
  • The knee or angle brace must:

    • Intersect the bearer at least 3 feet from the form, and

    • Be at approximately a 45 angle.
  • The lower end of the knee or angle brace must be nailed to a vertical support. [1926 Subpart L Appendix A (2)(g)(5)(ii)]

Metal Bracket Scaffolds
[1926 Subpart L Appendix A (2)(g)(6)]
Maximum intended load 25 pounds/foot
Uprights 2 x 4 inches
Bearers As designed
Braces As designed

Wooden Bracket Scaffolds
[1926 Subpart L Appendix A (2)(g)(7)]
Maximum intended load 25 pounds/foot
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 Scaffolds
General Requirements
  • Scaffold brackets must be constructed to:

    • Fit the pitch of the roof

    • Provide a level of support for the platform [1926.452(h)(1)]
  • Brackets must be anchored in place by nails unless it is impractical to use nails. [1926.452(h)(2)]

  • When nails are not used, brackets must be secured with first-grade manila rope of at least 3/4-inch diameter, or equivalent. [1926.452(h)(2)]
Roof Bracket Scaffold

Roof Bracket Scaffold



Outrigger Scaffolds
General Requirements
  • Outrigger beams must be:

    • Secured in place to prevent movement, and

    • Securely braced at the fulcrum point to prevent tipping. [1926.452(i)(4)]

  • The inboard end of outrigger beams must be:

    • Not less than 1 times the length of the outboard end, measured from the fulcrum point to the extreme anchorage point [1926.452(i)(1)], and

    • Securely anchored either by:

      • Braced struts bearing against sills in contact with the overhead beams or ceiling, or

      • Tension members secured to the floor joists underfoot, or

      • Both. [1926.452(i)(5)]
  • The fulcrum point of outrigger beams must rest on secure bearings at least 6 inches in each horizontal dimension. [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. [1926.452(i)(2)]

  • The entire supporting structure must be securely braced to prevent any horizontal movement. [1926.452(i)(6)]

  • To prevent their displacement, platform units must be:

    • Nailed,

    • Bolted, or

    • Otherwise secured to outriggers. [1926.452(i)(7)]
  • Scaffolds and scaffold components must be: 

    • Designed by a registered professional engineer, and

    • Constructed and loaded in accordance with that design. [1926.452(i)(8)]
Outrigger scaffold

Outrigger scaffold



Window Jack Scaffolds
General Requirements
  • Scaffolds must be securely attached to the window opening. [1926.452(l)(1)]

  • Scaffolds must be used only for working  at the window opening through which the jack is placed. [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. [1926.452(l)(3)]
Non-mandatory Guidelines
Window Jack Scaffold

Window Jack Scaffold



Crawling Boards (Chicken Ladders)
General Requirements
  • Crawling boards must extend from the roof peak to the eaves when used in roof construction, repair, or maintenance. [1926.452(m)(1)]

  • Crawling boards must be secured to the roof by:

    • Ridge hooks, or by

    • Means that provide equivalent strength and durability. [1926.452(m)(2)]
Non-mandatory Requirements
  • Crawling boards must be not less than 10 inches wide and 1 inch thick. [1926 Subpart L Appendix A (2)(m)]

  • Cleats on crawling boards must:

    • Be equal in length to the width of the board,

    • Be spaced at equal intervals not to exceed 24 inches, and

    • Have a minimum cross-sectional area of 1 x 1-1/2 inches. [1926 Subpart L Appendix A (2)(m)]
Crawling Board (Chicken Ladder)

Crawling Board
(Chicken Ladder)



Step, Platform, and Trestle Ladder Scaffolds
General Requirements
  • Scaffold platforms must be placed no higher than the second-highest rung or step of the ladder supporting the platform. [1926.452(n)(1)]

  • All ladders used in step, platform and trestle ladder scaffolds must:

    • Meet the requirements of 1926 Subpart X (Stairways and Ladders), except that job-made ladders are not permitted, [1926.452(n)(2)]

    • Be prevented from slipping by how they are:
  • Scaffolds must not be bridged one to another. [1926.452(n)(4)]
Step, Platform, and Trestle Ladder Scaffold

Step, Platform, and Trestle Ladder Scaffold

 
 
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