How far must the rails of an extension ladder extend above an upper level for safe access?

For safe access, the rails of an extension ladder must extend at least 36 inches above the upper level. This height ensures that individuals using the ladder can securely grasp the ladder's rails when stepping onto or off of the upper surface, providing stability and reducing the risk of falls.

A minimum extension of 36 inches offers enough length for a firm handhold, which is vital for maintaining balance and security as a person transitions between the ladder and the upper level. This requirement reflects best practices in ladder safety protocols outlined by OSHA standards to prevent accidents on construction sites.