All stairways must have treads, risers, stringers, and handrails. Stair treads must be no less than 10 inches deep and risers must be no more than 7.5 inches high. Stringers must be protected from damage and must provide adequate support. Handrails must be installed on at least one side of stairways with 4 or more risers and must be graspable with a diameter between 0.9 and 1.5 inches. Top and bottom handrail extensions provide safety when mounting or dismounting stairs. Stairways must be at least 22 inches wide. Stairways used during construction must be kept clean and dry to prevent slipping. All ladders used in construction must be non-conductive or have non-conductive side rails when working near electrical lines. Ladders must have a minimum capacity of 250 pounds and must be maintained in good condition. Rungs must not be split, cracked, or broken and must have secure foot at the base to prevent slipping. Ladders must be positioned at a 4 to 1 angle, meaning 4 feet of height for every 1 foot of horizontal distance. Ladders must extend 3 feet above the landing surface or must be secured at the top to prevent tipping. Ladders must not be used for any purpose other than accessing heights. Employees must maintain three points of contact when climbing and must face the ladder while climbing. Tool belts must be used to keep hands free when climbing.