Section 408.10651. Stairs.

(1) Stairs serving as a required exit shall comply with  the requirements of this part as to construction specifications and details, and of table 3.

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(2)   A variation in the width of tread or height of risers in any flight shall not exceed 3/16 inch.

(3)   A stair and a platform or landing used in connection therewith, in a building 4 stories or  more  in  height,  shall  be  of  noncombustible construction throughout, except for handrails.

(4)   A stair, platform, landing, balcony, and stair hallway floor shall be designed to carry a load of 100 pounds per square foot, or a concentrated load of 300 pounds so located as to  produce  maximum stress conditions.

(5)   Where the material of stair treads and  landings  is  such  as  to involve danger of slipping, nonslip material shall be  provided on  the tread surface.

(6)    Stairways and intermediate landings shall continue with no decrease in width along the direction of exit travel.

(7)   Monumental stairs, either inside or outside, may   be  accepted  as required exits if all requirements for exit stairs are complied with, except that curved stairs may be accepted with a radius of 25 feet or more at the inner edges.

History: 1979 AC.