Michigan Laws 125.1513d – Requirements for stairwell geometry
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(1) Notwithstanding any provision in this act and until the promulgation of the complete building code update after October 15, 1999, a governmental subdivision shall not enforce a requirement for stairwell geometry in occupancies in use group R-3 structures and within dwelling units in occupancies in use group R-2 structures that differs from the stairwell geometry described in this section.
(2) As used in this section:
Terms Used In Michigan Laws 125.1513d
- Building: means a combination of materials, whether portable or fixed, forming a structure affording a facility or shelter for use or occupancy by individuals, animals, or property. See Michigan Laws 125.1502a
- Code: means the state construction code provided for in section 4 or a part of that code of limited application and includes a modification of or amendment to the code. See Michigan Laws 125.1502a
- Governmental subdivision: means a county, city, village, or township that, in accordance with section 8a or 8b, has assumed responsibility for administration and enforcement of this act and the code within its jurisdiction. See Michigan Laws 125.1502a
(a) “Stairwell geometry” refers to the configuration of a stairwell of a building in which the maximum riser height is 8-1/4 inches (210 mm), the minimum tread depth is 9 inches (229 mm), and a 1-inch (25 mm) nosing on stairwells with solid risers.
(b) “Use group R-2 structures” means all multiple-family dwellings having more than 2 dwelling units including, but not limited to, boarding houses and similar buildings arranged for shelter and sleeping accommodations in which the occupants are primarily not transient in nature and dormitory facilities that accommodate more than 5 persons over 2-1/2 years of age.
(c) “Use group R-3 structures” means all buildings arranged for occupancy as 1-family or 2-family dwelling units including, but not limited to, not more than 5 lodgers or boarders per family; multiple single-family dwellings where each unit has an independent means of egress and is separated by a 2-hour fire separation assembly; and a child care facility that accommodates 5 or less children of any age.