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(a) Except in single-family and two-family dwellings, floor construction over basements shall provide fire resistance of not less than one hour.
(b) In buildings of Types III-B, III-C, IV-A and IV-B construction, fire protection shall not be required for floor construction over unexcavated spaces below the first floor, nor for floor construction over basements in single-family dwellings.
(Prior code § 49-10.3)