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b. Class B Interior Finish
Flame Spread 26-75. Includes any material classified at more than
25 but not more than 75 on the test scale described in paragraph
(4) hereof;
c. Class C Interior Finis
Flame Spread 76-200. Includes any material classified at more than
75 but not more than 200 on the test scale described in paragraph
(4) hereof;
d. Class D Interior Finish
Flame Spread 201 -500. Includes any material classified at more
than 200 but not more than 500 on the test scale described in
paragraph (4) hereof, and
e. Class E Interior Finish
Flame Spread over 500. Includes any material classified at over 500
on the test scale described in paragraph (4) below.
4. Interior finish materials as specified in paragraph (3) above shall be
classified in accordance with the Method of Test of Surface Burning
Characteristics of Building Materials, NFPA Pamphlet No. 255.
B. Fire Retardant Paints
1. In existing buildings the required flame spread classification of interior
surfaces may be secured by applying a proven fire retardant paints or
solutions to existing interior surfaces having a higher flame spread
rating than permitted.
2. Fire retardant paints or solution shall be renewed at such intervals as
necessary to maintain the necessary fire retardant properties.
C. Automatic Sprinklers
Where approved, supervised automatic sprinklers is installed, interior finish
with flame spread rating not over Class C may be used in any location
where Class B is normally specified, and with rating of Class B in any
location where Class A is normally specified, unless specifically prohibited
in this IRR.
D. Use of Interior Finishes
1. Interior finish material shall be used in accordance with requirements
for individual classes of occupancy specified elsewhere in the Rule.
Wherever the use of any class of interior finish is specified, the use of a
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