The4-to-1 Rule. A ladder safety standard, the 4-to-1 rule state that the ladder should be 1 foot away from the wall for every 4 feet the ladder rises. This allows for maximum stability. So, for instance, if the ladder touches the wall 8 feet off the ground, the base of the ladder should be 2 feet away from the wall.
The4-to-1 rule for ladders is a ratio. This ratio compares the distance of the base of the ladder from the wall to the height it reaches on the wall; for every four feet the ladder reaches up, the base needs to be one foot away from the wall. The 4-to-1 rule helps to stabilize the ladder in use and prevent an accident or injury.
Hereare five facts about ladder rung spacing and safety: 1. All ladders must meet certain standards for spacing between rungs – In the United States, all ladders must adhere to a standard known as ANSI A14.5. This requires at least nine inches (23cm) of clearance between the center-to-center of each consecutive ladder rung or step tread.
Followingthese guidelines will reduce your risk when working with ladders. Choose the right ladder, inspect it, set it up properly and climb safe. Dave Francis is the national safety director for Little Giant Ladders and holds five U.S. patents for ladder design. Reach him at dave@ 801-362-8586.
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4 to 1 rule ladder calculator
