All supported scaffolds 40 feet (12 192 mm) or more in height, outrigger scaffolds, and suspension scaffolds, including all supports, fastenings, connections, and details shall be designed in accordance with the provisions below.
Each scaffold and its components shall be capable of supporting, without failure, its own weight and at least four times the maximum intended load applied or transmitted to it in accordance with Section 3314.3.3. Each suspension rope, including connecting hardware, used on non-adjustable suspension scaffolds shall be capable of supporting, without failure, at least six times the maximum intended load applied or transmitted to the rope.
Where applicable, scaffolds and their connections to the building or structure shall be designed for wind loads as prescribed in Section 1609.
Copies of the plans, drawings, and specifications for all supports, fastenings, connections, and details shall be kept at the site and made available to the commissioner upon request.
Supported scaffolds between 40 feet and 75 feet (12 192 mm and 22 860 mm) must be designed by a qualified person or company or a registered design professional. Supported scaffolds over 75 feet (22 860 mm) in height must be designed by a registered design professional.
Outrigger scaffolds must be designed by a registered design professional.
Two-point suspended scaffolds having a support structure with a height from the roof or floor of less than 15 feet (4572 mm) must be designed by a licensed master or special rigger, or a registered design professional. All other suspension scaffolds must be designed by a registered design professional.
Scaffolds with loads exceeding 75 pounds per square foot (366.15 kg/m 2 ) shall be designed by a registered design professional.
Where parapet clamps are used to support a vertical load, a registered design professional shall verify that the supporting structure will not be overstressed.
When plans are required by this section, they shall include a plan view, an elevation view, details of anchorage, scaffold designation in accordance with Section 3314.3.3 and, for supported scaffolds, the number of planked levels and the number of levels to be loaded simultaneously.
All scaffolds shall be designed for one of the intended loads described in Section 3314.3.3.1 to 3314.3.3.4. No scaffold shall be loaded in excess of the maximum load for which it is designed. Loads shall not be concentrated so as to cause stresses in excess of the allowable values designated for the applicable material described in this code.
The light duty scaffold is to be used for loads up to 25 pounds per square foot (122.05 kg/m2), and is intended for use by carpenters, painters, or others of similar trades. It shall not be used to support loads more severe than those imposed by such workers and a minimum amount of lightweight materials.
The medium duty scaffold is to be used for loads up to 50 pounds per square foot (244.1 kg/m2), and is intended for use by bricklayers, plasterers, pipe fitters or other similar trades. It shall not be used to support loads more severe than those imposed by such workers and a moderate amount of their materials.
The extra heavy duty scaffold is to be used for loads exceeding 75 pounds per square foot (366.15 kg/m2) and shall be designed in accordance with Section 3314.3.1.4.
With the exception of the planking, the following scaffolds shall be constructed of noncombustible materials:
1. Exterior scaffolds exceeding 75 feet (22 860 mm) in height.
2. Interior scaffolds exceeding 21 feet (6.4 mm) in height.
3. All scaffolds used in the alteration, repair, or partial demolition of buildings in occupancy groups I-1 to I-4.