Mich. Admin. Code R. 400.4540 - Stairways, halls, and corridors
Rule 540.
(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 1 3/4-inch solid core wood
door with self-closing and latching hardware installed so that there is
effective fire and smoke separation between floors or each sleeping room on the
second floor shall be equipped with at least 1 13/4-inch solid core wood door
with latching hardware.
(2) In all
new and converted large and/or secure facilities, stairways and floor- to-floor
openings shall be enclosed with materials having at least the fire-resistance
rating specified by the national fire protection association standard No. 220,
"Standard on Types of Building Construction ", 2015
, for the type of construction. All other vertical openings
through floors shall be fire-stopped with like materials.
(3) Where a facility has 2 or fewer levels,
where both levels exit at grade, and where elevations between levels do not
exceed 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
not less than 11 inches deep, exclusive of nosing, and risers not more than 7
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 treads. A sturdy and
securely fastened handrail located between 34 and 38 inches, measured
vertically, above the nose of the treads shall be provided.
(6) Stairs in existing facilities approved
before these rules take effect shall continue to be approved until the portion
of the building encompassing the stairs is remodeled.
(7) An outside stairway or fire escape 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 may be allowed within this area
if they are stationary wire glass windows.
(8) In newly constructed small facilities,
halls, corridors, aisles, and stairs used as part of a means of egress shall be
not less than 44 inches wide and not less than 36 inches wide in converted
small facilities, except as required by
R
400.4538(10).
(9) In newly constructed and converted large
and secure facilities, halls, corridors, and aisles used as part of an exit way
shall be not less than 5 feet wide and 90 inches high, and stairs shall be not
less than 4 feet wide.
Notes
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