Mich. Admin. Code R. 400.10521 - Interior finish

Rule 521.

(1) The following alphabetical classification of finished materials for flame spread and smoke development, as determined by the tunnel test in accordance with the national fire protection association pamphlet no. 255, 1979; American society of testing materials standard E-84-77A, 1978; or underwriters laboratories standard no. 723, 1977, shall be used to classify interior finishes: Class Flame Spread Smoke Developed A 0-25 0-450 B 26-75 0-450 C 76-200 0-450 The same alphabetical classification is also used to classify combustibility of prefabricated acoustical tile units, as determined by federal specifications test no. SS-S-118a.

(2) Interior finish includes all of the following:

(a) The plaster, wood, or other interior finish materials of walls.

(b) Partitions, fixed or movable.

(c) Ceilings.

(d) Other exposed interior surfaces of the facility, other than nominal wood trim.

(3) 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 coverings, except where such paint or other covering is of such a character or thickness where applied so as to affect the material classification. Finishes such as lacquer, polyurethane-based materials, or unapproved wall coverings shall not be used.

(4) Paints or coatings that contain plastics, polyurethane, or epoxies may be used on noncombustible surfaces without proof of classification if they are not applied more than 8 mils in thickness.

(5) In a newly constructed, remodeled, or converted facility, an interior finish classification shall be that of the basic material used, without regard to subsequently applied paint or other covering in an attempt to meet the classification.

(6) In an existing facility, where an interior finish at the time these rules take effect does not comply with the provisions of subrule (5) of this rule and where an interior finish is applied to or furred out not more than 1 inch from a continuous noncombustible backing, an interior finish may have the surface protected with an approved fire retardant coating so as to meet the interior finish requirements.

(7) Interior finish materials in facilities shall have the following classifications:

(a) In small and large open facilities without a sprinkler system, class A or B in exitways and class A in behavior management rooms. In all other areas, at least class C.

(b) In open facilities with a sprinkler system, at least class C throughout, except in a behavior management room.

(c) In secure facilities, class A throughout.

Notes

Mich. Admin. Code R. 400.10521

1992 AACS