Occupational Safety and Health Administration OSHA

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Scaffolding eTool

Supported Scaffolds

Supported scaffolds consist of one or more platforms supported by outrigger beams, brackets, poles, legs, uprights, posts, frames, or similar rigid support. Because frame scaffolds are the most common type of supported scaffold, this eTool uses the frame module to describe requirements that are common to all supported scaffolds. Requirements specific to the other scaffold types are described only in their respective modules.

Frame Scaffold or Fabricated Frame - Photo Credit: OSHA Directorate of Construction

Frame Scaffold or Fabricated Frame

Platform(s) supported on fabricated end frames with integral posts, horizontal bearers, and intermediate members.

Ladder Jack - Photo Credit: OSHA Directorate of Construction

Ladder Jack

A ladder jack scaffold is a simple device consisting of a platform resting on brackets attached to a ladder. Ladder jacks are primarily used on lighter loads because of their portability and cost-effectiveness.

Mast Climbers - Photo Credit: OSHA Directorate of Construction

Mast Climbers

Mast climbing supported scaffolds (Mast Climbers) carry much heavier loads than traditional scaffolding and serve to position personnel, along with necessary tools, equipment, and materials to perform work at great heights. [Also see OSHA's Overview PowerPoint.]

Manually Propelled/Mobile

Mobile (Manually or Propelled)

Unpowered, portable, caster- or wheel-mounted supported scaffold.


Pole or Wood Pole

Posts with fixed connection points that accept runners, bearers, and diagonals, also made of wood, that can be interconnected at predetermined levels.

Pump Jack

Pump Jack

Platform supported by vertical poles and movable support brackets.



Scaffold types designed for a narrow and very specific range of applications.

Tube and Coupler

Tube and Coupler

Platform(s) supported by tubing, erected with coupling devices connecting uprights, braces, bearers, and runners.

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