OSHA 10-Hour Construction ReviewStairways and LaddersHard
A worker is setting up an extension ladder to access a roof. Before climbing, what critical step must be taken to ensure the ladder's stability, specifically concerning its sections?
- AConfirm that the overlap between sections meets the manufacturer's recommendations.
- BTie off the top of the ladder to the nearest secure structural member.
- CEnsure the ladder's base is painted a high-visibility color.
- DCheck that the rungs are free of any debris.
Show answer & explanationAnswer & explanation
Correct answer: A. Confirm that the overlap between sections meets the manufacturer's recommendations.
For extension ladders, proper overlap between sections is crucial for structural integrity. OSHA requires that the overlap meets the manufacturer's recommendations or a minimum specified amount (e.g., typically 3 feet for ladders up to 36 feet, more for longer ladders). Insufficient overlap can lead to ladder collapse.
Why the other options are wrong
- B. Tying off the top is important for preventing movement, but ensuring proper overlap is a prerequisite for the ladder's inherent structural stability.
- C. High-visibility paint is good for awareness but does not affect structural stability.
- D. While important for preventing slips, clearing debris from rungs does not address the structural stability of the extension mechanism itself.
Extension Ladder Overlap
The sections of an extension ladder must overlap sufficiently to maintain structural integrity, as per manufacturer specifications or OSHA minimums.
- Prevents ladder collapse.
- Ensures uniform strength along the ladder.
- A key pre-use inspection point for extension ladders.
Memory trick: Overlap strong, so you won't go wrong!