Section R. 400.1436 - Interior finishes and materialsRule 36.
(1) Interior finish materials shall be a minimum class C throughout the home.(2) Interior finish materials shall be securely attached to, or furred out at least 1 inch from, dry wall, plaster, masonry wall, ceiling, or natural solid wood which is a minimum of 3/4 of an inch thick.(3) The attaching of interior finish materials, other than dry wall, plaster, or natural solid wood, which is a minimum of 3/4 of an inch thick, directly to wall studs or to floor or ceiling joists, is prohibited.(4) Class C materials shall be those interior finish materials which have the following minimum classifications: (a) Flame spread -- 76-200.(b) Smoke density -- 126-200.(5) This rule does not apply to those adult foster care family home applicants or licensees who applied for a license or who were issued a license before the promulgation of these rules.Mich. Admin. Code R. 400.1436