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(3/4 inch) air space between and having a total thickness of 6.3 centimeters (2-1/2 inches).
(d) Three-Hour Fire-Resistive Time Period Rating
(1) The following partitions, walls, and floors shall have a three-hour fire-resistive rating: solid masonry,
17.8 centimeters (7 inches) thick; hollow unit masonry, 25.4 centimeters (10 inches) thick; and solid
concrete, 15 centimeters (6 inches) thick.
(2) The following protection for metal structural members shall have a three-hour fire resistive rating:
centimeters (2 inches) of concrete; 7.6 centimeters (3 inches) of masonry.
(e) Four-Hour Fire-Resistive Time Period Rating
(1) The following partitions, walls, and floors shall have a four-hour fire resistive rating: solic masonry
walls, 20 centimeters (8 inches) thick; hollow unit masonry, 30 centimeters (12 inches) thick; and solid
concrete, 17.8 centimeters (7 inches) thick.
(f) Steel Joists. Steel joist floors shall have from one to four-hour fire-resistive rating based on
internationally accepted standards of engineering.
(g) Flame-Proof Materials. Materials required to be flame-proofed shall be treated with a flame-retardant
having flame-spread rating of 50 less as determined by the "Tunnel Test".
SECTION 2.02.03: Interior Wall and Ceiling Finish
(a) General. Finishes for interior walls and ceilings of any building shall be classified according to their
flame-spread characteristics using the internationally accepted "Tunnel Test" or other equivalent test for
fire protection. The class of materials according to flame-spread characteristics shall be determined for
each occupancy group. The smoke density shall not be greater than that obtain from the burning of
untreated wood under similar conditions when tested in accordance with the "Tunnel Test" in the way
intended for use. The products of combustion shall be no more toxic than the burning of untreated wood
under similar conditions.
(b) Interior Finish Materials. Interior walls and ceiling finish shall mean interior wainscoting, paneling, or
other finish applied structurally or for decoration, acoustical correction, surface insulation or similar
purposes. Requirements for finishes shall not apply to trim, doors, and windows or their frames, nor to
materials which are less than one millimeter (0.039 inch) in thickness cemented to an incombustible
backing. Interior finish materials applied to walls and ceilings shall be tested as specified herein and
regulated for purposes of limiting flame-spread.
SECTION 2.02.04: Promulgation of Fire-Resistive Regulations
(a) The Secretary shall promulgate appropriate standards and regulations on the testing of materials for
flame-spread characteristics; application of controlled interior finish; finishes based on occupancy;
materials and tests on fire dampers, fire tests of building construction and materials, fire tests of door
assemblies, tin-clad fire doors, fire test of window assemblies, installation of fire door and fire windows,
and smoke and fire detectors for fire protective signaling systems; fire-resistive protection of structural
members; fire-resistive walls and partitions; fire-resistive floor-ceilings or roof-ceilings; fire-resistive
assemblies for protection of openings; and fire-retardant roof coverings.
TITLE 3 - REQUIREMENTS BASED ON OCCUPANCY
Chapter 3.01 - CLASSIFICATION OF ALL BUILDINGS BY
USE OR OCCUPANCY AND GENERAL REQUIREMENTS
FOR ALL OCCUPANCIES
SECTION 3.01.01: Occupancy Classified
(a) Building proposed, for construction shall be identified according to its use or the character of its
occupancy and shall be classified as follows:
(1) Group A - Residential: Dwellings. Group A Occupancies shall include dwellings.
(2) Group B - Residential: Hotels and Apartments. - Group B Occupancies shall include boarding or
lodging houses, hotels, apartment houses, convents, and monasteries (each accomodating more than
10 persons). chan robles virtual law library
(3) Group C - Education and Recreation. Group C Occupancies shall be any building used for school or
day care purposes more than eight hours per week, involving assemblage for instruction, education, or
recreation, and not classed in Group I or in Divisions 1 and 2 of Group H Occupancies.
(4) Group D - Institutional. Group D Occupancies shall include: Division 1 - Mental hospitals, mental
sanitariums, jails, prisons, reformatories, and buildings where personal liberties of inmates are similarly
restrained; Division 2 - Nurseries for full-time care of children under kindergarten age, hospitals,
sanitariums, nursing homes with non-ambulatory patients, and similar buildings (each accommodating
more than five persons); Division 3 - Nursing homes for ambulatory patients, homes for children of
kindergarten age or over (each accommodating more than five persons); Provided, That Group D
Occupancies shall not include buildings used only for private residential purposes or for a family group.
(5) Group E - Business and Mercantile. Group E Occupancies shall include: Division 1 - Gasoline filling
and service stations; storage garage and boat storage structures where no work is done except exchange
of parts and maintenance