Mich. Admin. Code R. 400.10537 - Stairways, halls, corridors, and aisles

Rule 537.

(1) In existing and small facilities, all stairways and other vertical openings shall be enclosed with materials equal in fire resistance to the standard partition construction of the building, if such partition construction is at least standard lath and plaster. There shall be at least a 1 3/4-inch solid-core wood door that has self-closing and latching hardware which is installed so that there is effective fire and smoke separation between floors or, alternatively, each sleeping room on the second floor shall be equipped with at least a 1 3/4-inch solid-core wood door with latching hardware.

(2) In all new and converted large and secure facilities, stairways shall be enclosed with materials that have at least the fire-resistance rating specified by the national fire protection association pamphlet no. 220, 1979, for the type of construction. All other vertical openings through floors shall be fire-stopped with like materials.

(3) If a facility has less than 3 levels, if each level exits at grade, and if elevations between levels are not more than 4 feet, the building shall be considered to be 1 story and enclosures shall not be required between levels.

(4) In all new and converted facilities, stairs shall have treads and risers of uniform width and height, with treads that are not less than 9 1/2 inches deep, exclusive of nosing, and risers that are not more than 7 3/4 inches in height.

(5) Stairs in new, remodeled, and converted facilities shall change direction by use of an intermediate landing and not by a variance in the width of the treads. A sturdy and securely fastened handrail that is located between 30 and 34 inches, measured vertically, above the nose of the treads shall be provided.

(6) Stairs in existing facilities that are approved before these rules take effect shall continue to be approved until the portion of the building that encompasses the stairs is remodeled.

(7) An outside stairway or fire escape that is used as part of an approved means of egress shall be protected against fire in the building by blank or closed walls directly under such stairway and for a distance of 6 feet in all directions. Windows are permitted within this area if they consist of wire glass set in unopenable frames.

(8) In newly constructed small facilities, halls, corridors, aisles, and stairs that are used as part of a means of egress shall be not less than 44 inches wide and shall be not less than 36 inches wide in converted small facilities, except as required by R 400.10535(10).

(9) In newly constructed and converted large and secure facilities, halls, corridors, and aisles that are used as part of a means of egress shall be not less than 5 feet wide and 90 inches high and stairs that are used as part of an exit shall be not less than 4 feet wide.

Notes

Mich. Admin. Code R. 400.10537

1992 AACS