WAC 296-876-60015. Pitch

You must make sure the pitch of the ladder is no greater than ninety degrees from the horizontal. Notes: 1. The preferred pitch of fixed ladders is within the range of seventy-five to ninety degrees from the horizontal. Ladders with a pitch range of sixty to seventy-five degrees from the horizontal are considered substandard and are only permitted if necessary to meet the installation requirements. 2. Fixed stairs are an alternative for installations where a pitch angle of less than sixty degrees is necessary. See Fixed industrial stairs, WAC 296-24-765 , in the General Safety and Health Standards, chapter 296-24 WAC.