Michigan Residential Builders License Practice Test

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What is the maximum height for a ladder jack scaffold when using type I manufactured ladders?

15 feet
18 feet
20 feet
25 feet

The correct answer is: 20 feet

The maximum height for a ladder jack scaffold when using type I manufactured ladders is 20 feet. This height restriction is established to ensure safety and stability when using these types of scaffolding systems. Ladder jack scaffolds, which are supported solely by ladders, can become unstable at greater heights due to the potential for tipping or swaying. Type I manufactured ladders are designed to hold a maximum load capacity, which is another factor in determining safe working heights. The regulation ensures that workers are within a safe working height that also considers the ladder's structural integrity. Exceeding 20 feet could increase the risk of accidents or falls, making it crucial for compliance with safety standards in construction environments. Proper height limits not only protect workers but also help maintain productivity and efficiency on job sites.