OCCUPANCY TYPE (new building) CODE REF. INTERIOR WALL AND CEILING FINISH
AMBULATORY (Sprinklered) NFPA 101, 2012 (20.3.3, 38.3.3.2, and 10.2.3) Class A, B, or C
AMBULATORY (Not Sprinklered) NFPA 101, 2012 (20.3.3, 38.3.3.2 and 10.2.7) Class A, or B in exits or corridors Class A, B, or C in offices
BUSINESS (Sprinklered) NFPA 101, 2012 (38.3.3.2 and 10.2.3) Class A, B, or C
BUSINESS (Not Sprinklered) NFPA 101, 2012 (38.3.3.2 and 10.2.3) Class A, or B in exits or corridors Class A, B, or C in offices
HEALTHCARE NFPA 101, 2012 (18.3.3.2 and 10.2.3) Class A, or B
EDUCATIONAL (14.3.3.2 and 10.2.3) Class-A for Exit Enclosures Class-B or Class-A for other than exits Class-C, Class-B or Class-A for low height partitions <1525mm
ONE & TWO FAMILY DWELLINGS (24.3.3.1 and 10.2) Class-A, Class-B or Class-C
HOTELS AND DORMITORIES (28.3.3.2 and 10.2) Class-A for Exit Enclosures Class-B or Class-A for Lobbies and Corridors Class-C, Class-B or Class-A for other spaces
APARTMENTS (30.3.3.2 and 10.2) Class-A for Exit Enclosures Class-B or Class-A for Lobbies and Corridors Class-C, Class-B or Class-A for other spaces
MERCANTILE (36.3.3.2 and 10.2) Class B or Class-A
STORAGE (42.3.3.2 and 10.2) Class-C, Class B or Class-A
Flame Spread Ratings

Class A - Flame-spread 0-25, smoke developed 0-450.

Class B - Flame-spread 26-75, smoke developed 0-450.

Class C - Flame-spread 76-200, smoke developed 0-450.

(what-is-flame-spread-and-smoke-developed?)

The requirements pertaining to interior finish are intended to restrict the spread of fire over the continuous surface forming the interior portions of a building.
“Interior wall or ceiling finish that is required elsewhere in this Code to be Class A, Class B, or Class C shall be classified based on test results from NFPA 255, ASTM E-84, or UL 723.”
Notes: