OSHA 10-Hour Construction ReviewScaffoldsEasy
A construction crew is setting up a supported scaffold. The scaffold platform is 15 feet above the lower level. According to OSHA standards, what is the minimum height above the platform that the top edge of the guardrail must be located?
- A48 inches
- B38 inches
- C30 inches
- D42 inches
Show answer & explanationAnswer & explanation
Correct answer: D. 42 inches
OSHA requires the top edge of a guardrail system to be 38 to 45 inches above the walking/working level. 42 inches falls within this acceptable range.
Why the other options are wrong
- A. 48 inches is higher than the maximum required height, though not explicitly prohibited.
- B. 38 inches is the minimum, but 42 inches is also a common and acceptable height.
- C. 30 inches is too low for the top edge of a guardrail.
Scaffold Guardrail Height
The top edge of a scaffold guardrail must be positioned at a specific height range above the working platform to prevent falls.
- Minimum height: 38 inches (97 cm)
- Maximum height: 45 inches (114 cm)
- Midrails are also required, approximately halfway between the top rail and the platform.
Memory trick: Guardrails Keep Workers Safe, High and Tight.