Question

What is the minimum height a portable ladder should extend above the upper landing surface?

1) 1 foot
2) 2 feet
3) 3 feet
4) 4 feet

Answer 1

The minimum height a portable ladder should extend above the upper landing surface is 3 feet to ensure safety and stability when transitioning from the ladder to the upper surface.

Step-by-step explanation:

The minimum height a portable ladder should extend above the upper landing surface is 3 feet. This height ensures that the person using the ladder can safely transition from the ladder to the upper landing surface without any risk of falling. If the ladder is too short, there is a greater chance of losing balance and falling. For example, if the upper landing surface is a roof, a 3-foot extension would provide enough height for the person to step onto the roof with stability.