What is the tallest extension ladder allowed on a job site?

• A. 72 feet
• B. 60 feet
• C. 80 feet
• D. 100 feet

Answer: (A)

On a job site, safety and practicality limit how tall a portable extension ladder can be used. Ladders must be set at a safe angle (roughly a 4:1 base-to-height ratio) and be easy enough to handle, move, and secure. The longer a ladder is, the harder it is to maintain that safe angle, to transport, and to stabilize at the top. For that reason, the longest portable extension ladders you’ll typically encounter are about 72 feet. Ladders longer than that become unwieldy and usually require different equipment or rigging (such as scaffolding or lifts) and more complex safety procedures. So 72 feet represents the practical maximum for a portable extension ladder on most job sites. Always follow manufacturer limits and applicable safety regulations for any ladder you use.