Construction Group I – Noncombustible

NYC Admin. Code tit. 27, ch. 1, subch. 3, art. 15

in effect

NYC Admin. Code § 27-274 Classification.

§ 27-274 Classification. Buildings or spaces in noncombustible construction group I are those in which the walls, exitways, shafts, structural members, floors, and roofs are constructed of noncombustible materials and assemblies affording the fire-resistance ratings specified in table 3-4. The noncombustible construction group I consists of classes I-A, I-B, I-C, I-D, and I-E.

NYC Admin. Code § 27-275 Construction class I-A.

§ 27-275 Construction class I-A. Includes buildings and spaces in which the bearing walls and other major structural elements are generally of four-hour fire-resistance rating.

NYC Admin. Code § 27-276 Construction class I-B.

§ 27-276 Construction class I-B. Includes buildings and spaces in which the bearing walls and other major structural elements are generally of three-hour fire-resistance rating.

NYC Admin. Code § 27-277 Construction class I-C.

§ 27-277 Construction class I-C. Includes buildings and spaces in which the bearing walls and other major structural elements are generally of two-hour fire-resistance rating.

NYC Admin. Code § 27-278 Construction class I-D.

§ 27-278 Construction class I-D. Includes buildings and spaces in which the bearing walls and other major structural elements are generally of one-hour fire-resistance rating.

NYC Admin. Code § 27-279 Construction class I-E.

§ 27-279 Construction class I-E. Includes buildings and spaces in which the bearing walls and other major structural elements generally have no fire-resistance rating.

Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-48797Fetched: 10/24/2026