publication stairways regulations that require elevated areas https://www.osha.gov/Publications/ladders/osha3124.html https://www.osha.gov/Publications/ladders/osha3124.html https://www.osha.gov/Publications/ladders/osha3124.html Stairways & Ladders specific measurement requirements OSHA Publication 3124 - Stairways and Ladders Stairways & Ladders Stairways and Ladders: A Guide to OSHA Rules