What is the permissible variance in guardrail height?

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Multiple Choice

What is the permissible variance in guardrail height?

Explanation:
Guardrails are set to a standard height to provide reliable fall protection, with a small allowable variation to account for how systems are installed. The usual target height is about 42 inches above the walking surface, and a tolerance lets this height shift a bit without losing effectiveness. The permissible variance is plus or minus 3 inches, so the guardrail must be between 39 and 45 inches high. Measurements are taken from the top surface of the walking area to the top of the guardrail. Staying within this range keeps the barrier protective while accommodating practical installation differences.

Guardrails are set to a standard height to provide reliable fall protection, with a small allowable variation to account for how systems are installed. The usual target height is about 42 inches above the walking surface, and a tolerance lets this height shift a bit without losing effectiveness. The permissible variance is plus or minus 3 inches, so the guardrail must be between 39 and 45 inches high. Measurements are taken from the top surface of the walking area to the top of the guardrail. Staying within this range keeps the barrier protective while accommodating practical installation differences.

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