Question

which of the following is true regarding ladder safety?
the top must extend three feet over the roof surface
a ladder can only be 12 feet high
crews must clean ladders before each use to ensure rungs are not slippery
workers must always have three points of contact with the ladder

Explanation:

Ladder safety guidelines state that the top of a ladder should extend three feet over the roof surface for safe climbing up and over. A ladder can be higher than 12 feet. Cleaning ladders before each use is not a universal requirement for just - rung slipperiness. Workers should maintain three - point contact with the ladder for stability, but this is not always possible in all situations. The most widely - accepted and standard safety rule here is the three - foot overhang.

Answer:

The top must extend three feet over the roof surface