Railings 29 CFR

Midrails, screens, mesh, intermediate vertical members, or equivalent intermediate structural members must be provided between the top rail and stairway steps to the stair rail system. Midrails, when used, must be located midway between the top of the 

Stair rail system and the stairway steps. Screens or mesh, when used, must extend from the top rail to the stairway step and along the opening between top rail supports. 

Intermediate vertical members, such as balusters, when used, must not be more than 19 inches apart. Other intermediate structural members, when used, must be installed so that there are no openings of more than 19 inches wide. 

Handrails and the top rails of the stair rail systems must be able to withstand, without failure, at least 200 pounds of weight applied within two inches of the top edge in any downward or outward direction, at any point along the top edge. The height of handrails must not be more than 37 inches nor less than 30 inches from the upper surface of the handrail to the surface of the tread. The height of the top edge of a stair rail system used as a handrail must not be more than 37 inches nor less than 36 inches from the upper surface of the stair rail system to the surface of the tread. 

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