What distance from a vertical wall should the base of a portable ladder be when in use?

What distance from a vertical wall should the base of a portable ladder be when in use?

• A. One half the working length
• B. Equal to the height of the ladder
• C. One fourth the working length of the ladder
• D. One third the working length

Answer: (C)

Safe ladder setup relies on a proper angle between the ladder and the wall. The recommended rule of thumb is the 4:1 approach: the base should be about one quarter of the ladder’s working length away from the wall. This places the ladder at roughly a 75-degree angle, which helps keep the top steady and the base planted, reducing the chances of the ladder slipping or tipping. If the base were much closer to the wall, the ladder would be steeper than the ideal angle, increasing tip-back risk and making ascent or descent unstable. If the base were much farther out, the ladder would be too shallow, increasing the chance that the top slides down the wall. Sticking to about one quarter of the ladder’s length for the base distance strikes a safer, balanced angle.

Safe ladder setup relies on a proper angle between the ladder and the wall. The recommended rule of thumb is the 4:1 approach: the base should be about one quarter of the ladder’s working length away from the wall. This places the ladder at roughly a 75-degree angle, which helps keep the top steady and the base planted, reducing the chances of the ladder slipping or tipping.

If the base were much closer to the wall, the ladder would be steeper than the ideal angle, increasing tip-back risk and making ascent or descent unstable. If the base were much farther out, the ladder would be too shallow, increasing the chance that the top slides down the wall. Sticking to about one quarter of the ladder’s length for the base distance strikes a safer, balanced angle.