CSLB General Building (B)Framing and CarpentryEasy
A contractor installs a guardrail along an open stairway landing that is 36 inches above the finished floor. The building inspector requires a taller rail. What is the minimum required guardrail height for this application?
- A30 inches
- B36 inches
- C42 inches
- D34 inches
Show answer & explanationAnswer & explanation
Correct answer: C. 42 inches
Guards protecting open-sided walking surfaces, landings, and balconies must be a minimum of 42 inches high, measured vertically from the adjacent walking surface. This is distinct from stair handrail height (34–38 inches), which applies only to graspable handrails on the stair run itself.
Why the other options are wrong
- A. Too low; not compliant with any guard or handrail requirement.
- B. Still below the required minimum guard height.
- D. This is within the handrail height range, not the guard height requirement.
Guardrail Height
The minimum vertical height required for guards protecting open-sided floor and landing areas to prevent falls.
- Minimum 42 inches for guards on landings/balconies
- Different from stair handrail height (34-38 inches)
- Measured vertically from the walking surface
Memory trick: '42 keeps you safe at the edge.'