Question: Why does the final rule limit RDS use to 300 feet above grade?

Answer: Evidence shows that using RDS at heights above 300 feet (greater than 30 stories) can be dangerous, particularly due to the effects of wind on longer ropes. OSHA adopted the 300-foot height limit from the ANSI/IWCA I-14.1 – 2001 national consensus standard on window cleaning. The final rule permits employers to use RDS above 300 feet only in cases where an employer demonstrates it is not feasible or creates a greater hazard to access such heights by any other means (e.g., powered platforms).