Section R. 400.18643 - Sprinkler system required; exceptionRule 643. All existing congregate facilities, or portions thereof, that are made not of fire-resistant construction shall be protected by an approved automatic sprinkler system, except as follows:
(a) An existing 1-story congregate facility which has a concrete floor, which does not have a basement, which, upon review, may be classified by an authorized inspection authority as protected ordinary construction, which has competent partitions and doors separating rooms from exit corridors, which has storage rooms that are segregated and protected, which is in compliance with other applicable features provided for in these rules, and which is entirely protected by an approved automatic fire detection system.(b) An existing congregate facility where residents occupy the first floor only, if other applicable features of these rules are complied with and the entire building is protected by an approved automatic fire detection system.(c) A building which is attached to a congregate facility building, and which is not used in any part for facility purposes, and which is separated from the facility building by an unpierced firewall that has not less than a 4-hour-fire-resistance rating.(d) A building that is not used in any part for home purposes when so located as to provide a horizontal outside separation by distance from the building in accordance with recognized standards.Mich. Admin. Code R. 400.18643