WAC 296-876-40045. Multisection ladders

(1) You must make sure not to tie or fasten ladder sections together to make longer ladders unless: (a) The ladder manufacturer endorses this type of use; and (b) You have hardware fittings specifically designed for this purpose. (2) You must make sure each section of a multisection ladder, when fully extended and locked in position to be used, overlaps the adjacent section as indicated in Table 2, Minimum Required Overlap for Extension Ladders. Table 2 Minimum Required Overlap for Extension Ladders If the ladder size (feet) is: Minimum required overlap (feet) for a two-section ladder is: Up to and including 36 3 Over 36 up to and including 48 4 Over 48 up to and including 60 5 If the ladder size (feet) is: Minimum required overlap (feet) for a two-section ladder is: Up to and including 36 3 Over 36 up to and including 48 4 Over 48 up to and including 60 5