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406.5 Riser Construction

Minnesota Building Code 2015 > 4 Egress > 406 Aisle Stairs > 406.5 Riser Construction

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Risers shall be of solid construction.

Exceptions:

Openings in risers are permitted provided the opening does not exceed 0.5 inches (12.7 mm) in height and width.
Solid risers are not required in telescopic and folding seating where necessary to maintain opening and closing operational clearances.

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