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Supported scaffolds shall meet the requirements of Sections 3314.9.1 through 3314.9.4.
3314.9.1 Height-to-Base Ratio
A supported scaffold with a height-to-base ratio (including outriggers supports, if used) of more than four to one (4:1) shall be restrained from tipping by guying, tying, bracing or equivalent means as follows:
  1. Guys, ties, or braces shall be installed at locations where horizontal members support both inner and outer legs.
  2. Guys, ties, or braces shall be installed in accordance with the design drawings required by Section 3314.3, or where design is not required, in accordance with the manufacturer's specifications. If design is not required and there are no manufacturer's specifications, the first guy, tie or brace shall be installed at a horizontal member and not more than a distance four times the least plan dimension from the base support and be repeated vertically at locations of horizontal members every 20 feet (6096 mm) or less thereafter for scaffolds 3 feet (914 mm) wide or less, and every 26 feet (7925 mm) or less thereafter for scaffolds greater than 3 feet (914 mm) wide. In every instance, the capacity of requirements of Section 3314.4.4.3 shall apply, which may necessitate guys, ties or braces being installed at smaller intervals.
  3. The top guy, tie, or brace shall be placed no further than four times the least plan dimension from the top. Such guys, ties, or braces shall be installed at each end of the scaffold and at horizontal intervals not to exceed 30 feet (9144 mm) measured from one end (not both) towards each other.
  4. Guys, ties, braces, or outriggers shall be used to prevent tipping of supported scaffolds in all circumstances where an eccentric load, such as a cantilevered work platform, is applied or is transmitted to the scaffold.
3314.9.2 Foundation
Supported scaffold poles, legs, posts, frames and uprights shall bear on base plates and mud sills or other adequate firm foundation to distribute the weight of the scaffold into the ground, structure, or sidewalk shed upon which it rests. Unstable objects shall not be used to support scaffolds or platform units.
3314.9.3 Plumb
Supported scaffold poles, legs, posts, frames, and uprights shall be plumb and braced to prevent swaying and displacement. The tolerance shall not exceed L/100, where L is the distance measured from the ground or grade elevation to the first cross brace or bottom of the first bearer or frame horizontal member.
3314.9.4 Supported Scaffolds at the Edge
Supported scaffolds located on a floor, working deck, or roof and located within a distance from the edge of the roof or an unenclosed perimeter that is equal to or less than one and one-half times the height of the scaffold shall:
  1. Be positively anchored or tied-back, and with all wheels or rollers secured by rope, cable, or chocking at the wheels in order to prevent movement; and
  2. Have all sides of the scaffold facing an unenclosed perimeter or the edge of a roof within a distance that is equal to or less than one and one-half times the height of the scaffold provided with guardrails and debris netting in accordance with Section 3314.8; or
  3. Have all material and equipment susceptible to dislodgement, and not being actively held by a person, secured in a manner to prevent dislodgement by wind or accidental impact.
Exception: The above requirements shall not apply where vertical safety netting that meets the requirements of Section 3308.5, or an approved alternate system, extends to cover the full height and width of all unenclosed perimeters within a distance from the scaffold equal to or less than one and one-half times the height of the scaffold.

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3314.3.1.1 Safeguards During Construction or Demolition, Supported Scaffolds
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 ...