503 EM 385-1-1 Sections 20-26

22.E.09 Working surfaces.

1. Light metal platforms, when used, must be of a type tested and listed by a nationally recognized testing laboratory.
2. Ladder-type platforms are prohibited.
3. Planking.
• (1) Planking must be composed of not less than nominal 2-in x 10-in (5-cm x 25.4-cm) unspliced planks, cleated together on the underside, starting 6 in (15.2 cm) from each end at intervals not to exceed 4 ft (1.2 m).
• (2) The planking must not extend beyond the hangers more than 12 in (30.4 cm). A bar or other effective means must be securely fastened to the platform at each end to prevent its slipping off the hanger.
• (3) The span between hangers for planked platforms must not exceed 8 ft (2.4 m).
4. Beam platforms are prohibited.

22.E.10 Suspended scaffolds must be guyed, braced, guided, or equipped with tag line to prevent swaying.

22.E.11 Two-point suspension scaffolds.

1. Two-point suspension scaffold platforms must not be less than 20 in (50.8 cm) or more than 36 in (91.4 cm) wide. The platform must be securely fastened to the hangers by U-bolts or by other equivalent means.
2. The hangers of two-point suspension scaffolds must be made of mild steel, or equivalent materials, having a cross sectional area capable of sustaining four times the maximum rated load and must be designed with a support for a standard railing.
3. Two-point suspension scaffolds must be securely lashed to the structure. Window cleaner's anchors must not be used.
4. The platform on every two-point suspension scaffolds must be of the light metal or planking.
5. Two-point suspension scaffolds must not be joined by bridging.
6. Two-point suspension scaffold platforms, when in use, must be level within 1 in (2.5 cm) for every 1 ft (0.3 m) of platform length.

22.E.12 Mason's multiple-point adjustable suspension scaffolds.

1. When employees on the scaffold are exposed to overhead hazards, overhead protection equivalent in strength to 2 in (5-cm) planking must be provided on the scaffold not more than 9 ft (2.7 m) above the platform, laid tight and extending the entire width of the scaffold.
2. The scaffold must be capable of sustaining a load of 50 psf (2,394 Pa) and must not be overloaded.
3. The platform must be suspended by wire ropes from overhead outrigger beams.

22.E.13 Stonesetters' multiple-point adjustable suspension scaffolds must be designed and used in accordance with ANSI A10.8.

22.E.14 Working capacities.

22.F Hanging Scaffolds.

22.F.01 A hanging scaffold is a scaffold/work platform that is hung from a location (such as a lock gate) for work to be performed and that remains stationary until it is then repositioned with a crane/hoisting device. Hanging scaffolds must be designed by a RPE competent in structural design. Scaffold performance and components must meet or exceed those for general scaffolds and platforms found in ANSI A10.8-2001. > See Figure 22-1.

22.F.02 Hanging scaffolds must meet the following requirements:

1. The scaffold must be securely fastened to a vertical structure (i.e. wall, lock gate, etc.) by hooks over a secured structural supporting member, bolt-on brackets, or other secure attachment. The maximum span between secure attachments is 8 ft (2.4 m). Fasteners must be of adequate size to achieve design strength of scaffold.
2. The scaffold must be secured against an uplift force equal to two times the weight of the scaffold and its rated load by means of hooks, brackets, or other secure attachments designed and placed to counteract uplift.
3. The scaffold must have a secondary attachment method to secure it against falling if the primary attachment fails. This should be a flexible attachment, such as wire rope or chain, designed to withstand a minimum of five (5) times the weight of the scaffold and its rated load. The secondary attachment must be connected to an anchor point of the same load rating or greater.
4. The scaffold must have only one working level. Working platform decks must be slip resistant and securely attached to the scaffold frame. The maximum width, front to back, of decks is 42 in (106.6 cm). Grating used for deck surfaces must have a maximum width opening between bars small enough to prevent the rigging components used (slings, chains) from entering.
5. Standard guardrails systems meeting the requirements of Section 21.F.01 must be installed on all open sides and ends of the platform.
6. The scaffold must be conspicuously posted with a plate or other permanent marking that indicates:
• (1) Weight of the scaffold;
• (2) Number of personnel it was designed for;
• (3) Rated weight capacity;
• (4) Specific structure(s) it was designed to be attached to - this may be a code or other form of identification when designed for a number of different structures with similar structural attachment points;
• (5) Name of the RPE who designed the scaffold; and
• (6) Date of manufacture.
7. Hanging scaffolds designed to also function as crane- or other load handling equipment- (LHE-) supported personnel work platforms must meet the requirements of Section 16.T. This includes scaffolds that require a person to stand/ride on the platform while the initial attachment to the structure is made.
8. The space between the platform deck edge and the face of the vertical structure must not be more than 14 in (35.6 cm). Prior to use on each jobsite application, the CP must determine if this space constitutes a hazard by being large enough to allow tools or objects to fall on workers below or, if LHE rigging may enter and entangle in the space. In these situations, the space must be closed or blocked to remove the hazard.

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