California Painting and Decorating Contractor (C-33) License Practice Exam 2026 – Your All-in-One Guide to Mastering the Exam!

Ladder rung spacing is set to a comfortable, repeatable step height so most climbers can ascend with a natural one-foot lift per rung. The standard is 12 inches between rungs, measured from center to center. This consistent spacing keeps movements predictable, helps maintain balance, and reduces fatigue or the risk of missing a rung during climbing. Variations exist for some specialized ladders, but for typical painting and construction work, 12 inches is the norm. A smaller spacing, like 10 inches, would create a tighter, awkward step for many users, while larger spacings such as 14 or 16 inches would demand longer strides and increase the chance of losing balance.