Section R. 400.18639 - Interior finish and materialsRule 639.
(1) Wall and ceiling finish materials throughout resident facilities shall not be more hazardous than class A, except for necessary wood doors and wood trim.(2) Folding-type partitions when used as separations in rooms or between rooms shall be made of noncombustible material, except that impregnated wood or other material that conforms to the criteria of a class B finish material is acceptable.(3) The alphabetical classification of finish materials is for flame spread, fuel contribution, and smoke development as determined by the tunnel test in accordance with the provisions of national fire protection association standard 255-1972, ASTM-E-84-1968, or UL-723-1973 and grouped as follows: Flame Fuel Smoke
Class Spread Contributed Developed
A 0 - 25 0 - 35 0 - 50
B 26 - 75 36 - 75 51 - 125
C 76 - 200 76 - 200 126 - 200
(4) The same alphabetical classification is used for the combustibility of prefabricated acoustical tile units only, under federal specifications SS-A 118B-1958.(5) The documents referred to in subrules (3) and (4) of this rule are adopted by reference in this rule and may be purchased from the National Fire Protection Association, Batterymarch Park, Quincy, Massachusetts 02269, at a cost as of the time of adoption of these rules of 50 cents per page (NFPA 255-1972); the American Society for Testing and Materials, through University Microfilms International, 300 N. Zeeb Road, Ann Arbor, Michigan 48106, at a cost as of the time of adoption of these rules of $14.75 (ASTM-E-84-1968); Underwriters Laboratories, Incorporated, 333 Pfingsten Road, Northbrook, Illinois 60062, at a cost as of the time of adoption of these rules of 20 cents per page (UL-723-1973); and SS-A-118B-1958 is available through the State Fire Safety Board, 7150 Harris Drive, Lansing, Michigan 48913.(6) Interior finish includes the exposed surfaces of walls, fixed or movable partitions, ceilings, and other exposed interior surfaces of buildings.(7) The classification of interior finish materials as to their flame spread and smoke development shall be that of the basic material used without regard to subsequently applied paint or other covering, except where paint or other covering is of such character or thickness or so applied as to materially affect the flame spread and smoke characteristics. Highly combustible material applications, such as lacquer or pyroxylin base materials, and unapproved wall coverings shall not be used.(8) Paints or coatings that contain plastics, polyesters, or epoxies may be used on noncombustible surfaces without proof of classification if they are not applied in excess of 8 mils total thickness.(9) Any new floor covering assembly shall be, at a minimum, a class B material.Mich. Admin. Code R. 400.18639