SafeMark Practice Test

What is the minimum base distance for a straight ladder according to the 4:1 rule?

One-half of the working height. One-third of the working height. One-quarter of the working height. The full working height from the wall.

Correct Answer:

One-quarter of the working height.

Explanation:

The 4:1 rule says the base distance from the wall should be one-quarter of the working height to keep the ladder at a safe angle. This yields about a 75-degree lean, which balances stability and reach. For example, if you can reach 12 feet, the base should be about 3 feet from the wall. Distances like half or one-third of the working height give a much shallower angle and reduce stability, while placing the base at the full working height would be nearly vertical and unsafe. The minimum base distance, therefore, is one-quarter of the working height.

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