OSHA 10-Hour Construction ReviewScaffoldsHard
A worker is working on a supported scaffold that is 6 feet high. What is the minimum required height for the toprail of the guardrail system, if required?
- A30 inches
- B48 inches
- C38 inches
- D42 inches
Show answer & explanationAnswer & explanation
Correct answer: C. 38 inches
OSHA requires fall protection (guardrails or personal fall arrest systems) for scaffolds 10 feet or more above a lower level. For scaffolds less than 10 feet, guardrails are generally not required. However, if guardrails are provided, the toprail must be between 38 and 45 inches above the platform, with 38 inches being the minimum. The question specifies 'if required', implying a scenario where guardrails are present even if not strictly mandated by height.
Why the other options are wrong
- A. 30 inches is typically the minimum for midrails, not toprails.
- B. 48 inches is above the maximum allowed toprail height.
- D. 42 inches is a common toprail height, but not the minimum.
Scaffold Guardrail Toprail Height
The OSHA-mandated range for the height of the toprail in a scaffold guardrail system, measured from the work platform.
- Toprail 38-45 inches above platform
- Midrail halfway between toprail and platform
- Required for scaffolds 10 feet or more high
Memory trick: Toprail's height, 38 to 45, keep it right!