Part 3 General Building Requirements
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3 Part 3 General Building Requirements
3.1 General. This section describes the requirements for building and structures based on use and
occupancy, building height and area, and construction type.
3.2 Definitions.
3.2.1 High-rise building. Structures or buildings where the highest occupiable floor is located more than 20 m
(65 ft) above the grade level around the building.
3.2.2 Occupiable roof. A roof-level shall be considered occupiable where access to the roof is provided and is
not limited to mechanical equipment.
3.3 Use and Occupancy.
3.3.1 General. Structures or portions of structures shall be classified based on occupancy in one or more of the
following occupancies listed below. For spaces that are used for more than one occupancy, the space
shall be classified based on all the occupancies present and shall meet the requirements of Section 3.4.
All other requirements of BNBC Part 3 Sections 1.3 and 2.1 shall be met.
3.3.2 Occupancy A: Residential. This occupancy shall include structures or portions used for sleeping and living
accommodations to related or unrelated groups of people. [See BNBC Part 2 Section 2.1.1]
3.3.3 Occupancy B: Educational Buildings. This occupancy shall include structures or portions used for daycare
(B2). [See BNBC Part 3 Section 2.1.2]
3.3.4 Occupancy E: Assembly Buildings. This occupancy shall include structures or portions where large groups
of people congregate or assembly. Examples would include: prayer halls and dining halls. Most factories
would have subcategories of E3 (Large Assembly without fixed seats) and E4 (Small Assembly without
fixed seats, less than 300 persons). [See BNBC Part 3 Section 2.1.5]
3.3.5 Occupancy F: Business Buildings. This occupancy shall include structures or portions used for the
transaction of business including offices (F1). [See BNBC Part 3 Section 2.1.6]
3.3.6 Occupancy G: Industrial Buildings. This occupancy shall include structures or portions used where
materials are fabricated, assembled, or processed. The G2, Moderate Hazard Industrial Occupancy will be
the predominant occupancy type in most RMG factories. [See BNBC Part 3 Section 2.1.7]
3.3.7 Occupancy H: Storage Buildings. This occupancy shall include structures or portions used for the storage
of material, products, and/or equipment. The H2, Moderate Risk Fire Storage will encompass the majority
of the storage facilities used in the RMG factories. [See BNBC Part 3 Section 2.1.8]
3.3.8 Occupancy J: Hazardous Buildings. This occupancy shall include structures or portions used for the
storage, processing, handling, or manufacture of any hazardous material. [See BNBC Part 3 Section 2.1.9]
3.3.9 Occupancy K: Miscellaneous Buildings. This occupancy shall include structures or portions used for
special structures not classified above. This could include water treatment plants, generator buildings,
electrical buildings, and other utility buildings. [See BNBC Part 3 Section 2.1.10]
3.4 Mixed Use.
3.4.1 General. Each portion of a building or structure shall be classified individually according to Section 3.3.
When a building contains more than one occupancy, the building or portion shall comply with the