OSHA 10-Hour Construction ReviewStairways and LaddersEasy
A construction crew is installing a new roof on a two-story building. They are using a portable ladder to access the roof. What is the minimum height the ladder's side rails must extend above the upper landing surface?
- A1 foot (30 cm)
- B3 feet (91 cm)
- C4 feet (122 cm)
- D5 feet (152 cm)
Show answer & explanationAnswer & explanation
Correct answer: B. 3 feet (91 cm)
OSHA requires that when portable ladders are used to access an upper landing surface, the side rails must extend at least 3 feet (91 cm) above that surface to provide a safe handhold for workers transitioning on and off the ladder.
Why the other options are wrong
- A. This is insufficient for safe access and egress.
- C. While a greater extension might be safer, it is not the minimum required by OSHA.
- D. This is a significantly greater extension than required and may not always be practical or necessary.
Ladder Extension Requirement
Portable ladders used to access an upper landing surface must have side rails extended a minimum of 3 feet (91 cm) above that surface.
- Applies to portable ladders accessing an upper level.
- Provides a stable handhold for transition.
- Measured from the upper landing surface.
Memory trick: Three feet high, you can safely fly.