Mich. Admin. Code R. 400.4620 - Interior finish
Rule 620.
(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, standard No. 255, 2006; American society
of testing materials E-84-77A, 2014; or Underwriters Laboratories standard No.
723, 2008, shall be used to determine interior finishes:
| Class | Flame Spread | Smoke Developed |
| A | 0 - 25 | 0 - 450 |
| B | 26 - 75 | 51 - 450 |
| C | 76 - 200 | 126 - 450 |
The same alphabetical classification is used for combustibility of prefabricated acoustical tile units, only under federal specifications test No. SS-5-118a.
(2) 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 to affect the material classification. Finishes such as
lacquer, polyurethane-based materials, or unapproved wall coverings shall not
be used.
(3) In a newly
constructed, remodeled, or converted residential group home, 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.
(4) Interior
finishes and materials shall be at least class C throughout.
Notes
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No prior version found.