Ladder Jack Scaffolds

A ladder jack scaffold is a supported scaffold consisting of a platform resting on brackets attached to ladders. Not more than two employees shall occupy any platform at any one time.

Ladder jack scaffolds must adhere to the following criteria:

• Platforms must not exceed a height of 20 feet.
• All ladders used to support ladder jack scaffolds must meet the requirements of 29 CFR 1926 Subpart X, "Stairways and Ladders," except that job-made ladders must not be used to support ladder jack scaffolds.
• The ladder jack must be designed and constructed so that it will bear on the side rails and ladder rungs or on the ladder rungs alone. If bearing on rungs only, the bearing area must include a length of at least 10 inches on each rung.
• Ladders used to support ladder jacks must be placed, fastened, or equipped with devices to prevent slipping.
• Scaffold platforms must not be bridged one to another.

To learn more about Scaffolding Safety visit our Construction Scaffolding Safety Online Training web page.