CSLB C-33 Painting & DecoratingSafetyMedium
A painting crew is working on a multi-story building and needs to access a section of wall 25 feet high. They plan to use an extension ladder. According to OSHA standards, what is the minimum distance the base of the ladder should be placed from the wall to ensure proper stability?
- A5 feet
- B6.25 feet
- C8.33 feet
- D4 feet
Show answer & explanationAnswer & explanation
Correct answer: B. 6.25 feet
OSHA requires that non-self-supporting ladders, such as extension ladders, be set up at a 4-to-1 ratio. This means for every 4 feet of vertical height, the base of the ladder should be 1 foot away from the wall. For a 25-foot height, the calculation is 25 feet / 4 = 6.25 feet.
Why the other options are wrong
- A. 5 feet would be for a 20-foot height, which is too close for a 25-foot ladder.
- C. 8.33 feet would be for a 33.32-foot height, which is too far and would make the ladder too steep.
- D. 4 feet would be for a 16-foot height, which is too close for a 25-foot ladder.
Ladder 4-to-1 Rule
A safety guideline for setting up non-self-supporting ladders, stating that the base should be placed 1 foot away from the wall for every 4 feet of vertical height.
- Ensures optimal stability and reduces risk of sliding or tipping.
- Applies to extension ladders, straight ladders, and other leaning ladders.
- Crucial for preventing fall hazards during elevated work.
Memory trick: Four up, one out, keeps your ladder stout.