Section R. 400.14503 - Interior finishes and materials generallyRule 503.
(1) Interior finish materials shall be at least class C materials throughout the adult foster care small group home.(2) Interior finish materials shall be securely attached to, or furred out not more than 1 inch from, walls or ceilings that are dry wall, plaster, masonry, or natural solid wood that is not less than 3/4 of an inch thick.(3) The attaching of interior finish materials, other than dry wall, plaster, or natural solid wood that is not less than 3/4 of an inch thick, directly to wall studs or to floor or ceiling joists is prohibited. Suspended ceilings constructed of a class A material that is 1/4 inch or greater in thickness and installed in accordance to manufacturers specifications shall be permitted.(4) Class A, B, and C materials are interior finish materials that have the following minimum characteristics: Class Flame Spread Smoke Developed
A 0-25 0-450
B 26-75 0-450
C 76-200 0-450
Mich. Admin. Code R. 400.14503