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
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