When using a portable extension ladder to access an elevated surface, how far must the ladder side rails extend above the surface?

When using a portable extension ladder to access an elevated surface, the recommended practice is for the ladder side rails to extend at least 3 feet above the surface to ensure safe and stable access. This extension provides users with a secure handhold when climbing on or off the ladder, helping to prevent falls or slips at the transition point.

The 3-foot extension is a standard guideline recognized in safety regulations and ladder usage recommendations, helping to maintain a safe workspace. When the side rails extend sufficiently above the edge of the surface, it significantly enhances stability, making it easier and safer for individuals to mount or dismount the ladder without losing their balance.