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
>	Bricklayers' Square Scaffolds
>	Horse Scaffolds
>	Form Scaffolds and Carpenters' Bracket Scaffolds
>	Roof Bracket Scaffolds
>	Outrigger Scaffolds
>	Window Jack Scaffolds
>	Crawling Boards (Chicken Ladders)
>	Step, Platform, and Trestle Ladder Scaffolds

<< Plasterers', Decorators', and Large-Area Scaffolds

General Requirements Scaffolds shall be constructed in accordance with the following paragraphs of this section, as appropriate: (a) Pole scaffolds (b) Tube and coupler scaffolds or (c) Fabricated frame scaffolds [1926.452(d)] Non-mandatory Guidelines The guidelines for pole scaffolds, Appendix A(2)(a), or tube and coupler scaffolds, Appendix A(2)(b), may be applied. [1926 Subpart L Appendix A(2)(d)]

<< 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)] 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 [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)] Non-mandatory Guidelines Maximum intended load (light duty) 25 pounds/foot²* Maximum intended load (med. 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. [1926 Subpart L Appendix A(2)(f)]

<< 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)]

<< 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 1½ 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)]

<< 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 Not more than one employee at a time may occupy a window jack scaffold. [1926 Subpart L Appendix A(2)(l)]

<< 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)]

<< 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: Placed, Fastened, or Equipped. [1926.452(n)(3)] Scaffolds must not be bridged one to another. [1926.452(n)(4)]