Section 27-280
§ 27-280 Classification. Buildings and spaces in combustible
construction group II are those in which the walls, partitions,
structural members, floors, and roofs are constructed wholly or partly
of combustible materials affording the required degree of
fire-resistance specified in table 3-4. The combustible construction
group II consists of classes II-A, II-B, II-C, II-D, and II-E.
Section 27-281
§ 27-281 Construction class II-A. Includes heavy timber construction
in which fire-resistance is attained by limiting the minimum sizes of
wood structural members and the minimum thickness and composition of
wood floors and roofs; by avoiding concealed spaces under floors and
roofs or by providing fire-stopping protection for these spaces; and by
using fastenings, construction details, and adhesives for structural
members as required by article seven of subchapter ten of this chapter.
The minimum dimensions for framing members shall be prescribed in
section 27-623 of article seven of subchapter ten of this chapter,
except that members which are protected to provide a fire-resistance
rating of at least one hour need not comply with this requirement.
Section 27-282
§ 27-282 Construction class II-B. Includes buildings and spaces in
which the exterior walls, fire walls, exitways, and shaft enclosures are
of noncombustible materials having the required fire-resistance ratings;
and in which the floors, roofs, and interior framing are wholly or
partly of wood of smaller dimensions than required for class II-A
construction, or are of other combustible or noncombustible materials,
having the required fire-resistance ratings.
Section 27-283
§ 27-283 Construction class II-C. Includes buildings and spaces in
which the exterior walls, fire walls, exitways, and shaft enclosures are
of noncombustible materials having the required fire-resistance ratings;
and in which the floors, roofs, and interior framing are wholly or
partly of wood of smaller dimensions than required for class II-A
construction, or are of other combustible or noncombustible materials
having no fire-resistance ratings.
Section 27-284
§ 27-284 Construction class II-D. Includes buildings and spaces in
which the exterior walls, bearing walls, floors, roofs, and interior
framing are generally of wood or other combustible materials having the
required fire-resistance ratings.
Section 27-285
§ 27-285 Construction class II-E. Includes buildings and spaces in
which the exterior walls are generally of wood or other combustible
materials having the required fire-resistance ratings, and in which the
bearing walls, floors, roofs, and interior framing are of wood or other
combustible materials, generally having no fire-resistance ratings.
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