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Except in buildings of Type III-A, III-C or IV-B construction, all interior wall and ceiling finish shall be applied directly and securely to a noncombustible base or to furring or nailing strips not exceeding one inch in nominal thickness applied over a noncombustible base with all spaces behind the material filled with noncombustible material or firestopped at intervals not exceeding eight square feet in area. In buildings of Type III-A construction, interior wall and ceiling finish shall be applied directly to the wall or floor construction.
(Prior code § 62-9.4)