Original Link: http://buildingcode.gov.bd
TABLE OF CONTENTS
PART 1 Scope and Definition
Chapter 1 TITLE, SCOPE AND GENERAL
1.1 TITLE 1-1
1.2 PURPOSE 1-1
1.3 SCOPE 1-1
1.4 EXISTING BUILDINGS 1-2
1.4.1 Addition and Alteration 1-2
1.4.2 Change of Use 1-2
1.5 HISTORIC OR ARCHITECTURALLY VALUABLE BUILDINGS 1-2
Chapter 2 DEFINITIONS
2.1 GENERAL 1-3
2.2 DEFINITIONS OF TERMS 1-3
Chapter 3 ABBREVIATIONS
3.1 ABBREVIATIONS OF NAMES 1-7
3.2 ABBREVIATIONS OF WORDS 1-8
TITLE, SCOPE AND GENERAL
The provisions and regulations contained in this document shall constitute and be collectively known and may be cited as the “Bangladesh National Building Code:2012”, abbreviated, where desired, as BNBC, and will hereinafter be referred to as the “Code”.
The purpose of this Code is to establish minimum standards for design, construction, quality of materials, use and occupancy, location and maintenance of all buildings within Bangladesh in order to safeguard, within achievable limits, life, limb, health, property and public welfare. The installation and use of certain equipment, services and appurtenances related, connected or attached to such buildings are also regulated herein to achieve the same purpose.
The provisions of this Code are applicable to all persons of Bangladesh irrespective of class, creed, culture, religion or sex. The Code does not in any way create or otherwise establish or designate any particular class or group of persons who will or should be specially protected or benefited by the provisions of this Code.
The expressed intent of this Code is to insure public safety, health and general welfare insofar as they are affected by the construction, alteration, repair, removal, demolition, use or occupancy of buildings, structures or premises, through structural strength, stability, means of egress, safety from fire and other hazards, sanitation, light and ventilation.
The provisions of this Code shall apply to the design, construction, use or occupancy, alteration, moving, demolition and repair of any building or structure and to any appurtenances installed therein or connected or attached thereto, except such matters as are otherwise provided for in other ordinances and statutes controlling and regulating buildings.
If for any case different sections of this Code provide different specifications for materials, methods of design or construction, or other requirements, the most restrictive specification shall govern.
In case of any conflict between a general requirement and a specific requirement, the specific requirement shall be applicable.
Unless otherwise explicitly stated in this Code, all references to part, chapter or section numbers or to provisions not specifically identified by number, shall be construed to refer to such part, chapter, section or provision of this Code.
References made to a section without mentioning a part shall be construed to refer to that section of the part in which the reference is made.
The provisions of any appendix in this Code shall not be mandatory unless they are referred to as such in any section of the Code or they are specifically adopted by any regulation.
Inspection conducted or permission granted for any building or plan of building, under the provisions of this Code, shall not be construed as a warranty of the physical condition of such building or the adequacy of such plan. Neither the Authority administering the Code, nor any employee thereof shall be liable for damages or any defect or hazardous or illegal condition or inadequacy in such building or plan, nor for any failure of any component of such building which may occur subsequent to such inspection or granting of permission under the provisions of the Code.
1.4 EXISTING BUILDINGS
Buildings which are in existence on the date of promulgation of this Code may have their use or occupancy continued without undergoing any alteration, abandonment or removal unless in the opinion of the Authority such continued use is hazardous to life and property and provided such use or occupancy was legal on the date of promulgation of this Code. Buildings approved before adoption of the present updated Code and compliant with the previous version of the Code may continue to be used or occupied unless any deviation is made thereafter or any deterioration has rendered the building unsafe in the opinion of the Authority.
1.4.1 Addition and Alteration
Additions, alterations, modifications or repair to an existing building may be made without requiring the existing building to comply with all the requirements of this Code, provided the additions, alterations, modifications or repairs conform to that required for a new building. Such additions or alterations shall not be permitted when the existing building is not in full compliance with the provisions of this Code except when the addition or alteration will result in the existing building or structure being no more hazardous based on life safety, fire safety and sanitation than it was before the addition or alteration was undertaken. Any building together with the new additions shall not exceed the height, number of storeys and area specified in this Code for new buildings having the relevant occupancy and type of construction. Non-structural alterations or repairs to an existing building or structure which do not adversely affect any structural member, nor reduce the strength of any part of the building or structure to result in an unsafe condition shall be made with materials and components having the required fire resistance.
1.4.2 Change of Use
Change in use or occupancy in an existing building may be made when such change complies with the requirements of this Code for a new building and provided such change does not render any part or the whole of the affected building or structure any more hazardous based on life safety, fire safety and sanitation than it was before such change was effected.
1.5 HISTORIC OR ARCHITECTURALLY VALUABLE BUILDINGS
A building or structure which has been designated by official action as having special historical or archaeological interest, or a building or structure identified by a legally constituted authority as being architecturally valuable, may be undertaken for repairs, alterations and additions necessary for its preservation, restoration, rehabilitation or continued use provided:
a) the proposed repair, alteration or addition to buildings of historical or archaeological significance is approved by the legally constituted authority, such as the Department of Archaeology;
b) the proposed repair, alteration or addition to buildings of architectural value does not impair the aesthetic quality and architectural character of such buildings; and
c) the restored building or structure will be no more hazardous, if any, based on life safety, fire safety and sanitation than the existing building.
Unless otherwise expressly stated, the abbreviations, terms, phrases, words and their derivations listed below shall, for the purpose of this Code, be construed as set forth in this chapter. Words not explicitly defined shall have their ordinarily accepted meanings as the context implies as provided in The Oxford English Dictionary, second edition, Simpson, J. & Weiner, E., Ed., Oxford University Press, London, 1989; and Chambers Science and Technology Dictionary, Chambers Harrap Publishers Ltd, New York, 1999.
The terms defined in this part shall have a general applicability to the entire Code. Other than these, there are other terminology and definitions provided in different parts, chapters and sections which shall be applicable only to that particular part, chapter or section in which they are defined. In case of any conflict or contradiction between a definition given in this part and that in any other part, chapter or section, the meaning provided in that part, chapter or section shall govern for the interpretation of the provisions of that particular part, chapter or section. In general, definitions given in a lower level shall override the meanings of all upper levels for the interpretation of the provisions within the scope of that lower level.
2.2 DEFINITIONS OF TERMS
The terminologies used in this Code are defined in this section. Irrelevance of gender, tense and number is implicit in these definitions and throughout the Code. Words in the masculine gender include the feminine and the feminine the masculine. Verbs used in the present include the future. Words used in the singular include the plural and the plural the singular.
ACCESSORY USE: Any use subordinate to the major use which is normally incidental to the major use. ALTERATION: Any change, addition or modification in construction such as structural, dimensional, or any removal of any part of a building or any change to or closing of any required means of ingress or egress or a change to the fixtures or equipment or any change in land use or occupancy or use.
APPROVED: Approved by the Authority.
AUTHORIZED OFFICER: An officer appointed by the Government by notification in the Official Gazette to exercise in any area the functions of an Authorized Officer.
AUTHORITY: The Authority which has been created by a statute and which, for the purpose of administering this Code or part thereof, may authorize a committee or an official to act on its behalf. (This definition of Authority shall apply to all appearances of the term in this Code written with a capital A).
BUILDING: Any permanent or semi-permanent structure which is constructed or erected for human habitation or storage or for any other purpose and includes the foundation, plinth, walls, floors, roofs, chimneys, fixed platform, verandah, balcony, cornice, projections, extensions, annexes and any land or space enclosed by wall adjacent to it. The term building will also include the sanitary, plumbing, HVAC, outdoor display structure, signs and all other building service installations which are constructed or erected as an integral part of a building.
BUILDING LINE: The line up to which the plinth of a building may lawfully extend. Also known as SETBACK LINE.
BUILDING OFFICIAL: Same as AUTHORIZED OFFICER above. Having meaning and authority of same as AUTHORIZED OFFICER as defined in the Building Construction Act.
COMMITTEE: A Building Construction Committee constituted for any area in the prescribed manner, if necessary.
Construct, To: See ERECT, TO.
CONVERSION: The change in occupancy or premises to any occupancy or use requiring new occupancy permit.
COVERED AREA: The ground area above the plinth level which is covered by a building structure. The covered area of a building shall exclude gardens, wells, uncovered water and swimming pool, fountains, drainage structures, boundary wall, gates, single-storey open porch, uncovered staircase, watchman’s cabin, detached pump house, electrical substations, garbage chutes and other utility structures.
DEVELOPMENT: Carrying out construction of buildings, engineering, mining or other operations in, or over or under land or water. Includes redevelopment and layout and subdivision of any land. ‘To develop’ and other grammatical variations shall be interpreted accordingly.
DRAIN: A conduit or channel for conveying water, sewage, or other waste liquid for subsequent disposal. DRAINAGE: The disposal of any liquid with a system meant for this purpose.
ERECT, TO: To erect a new building or re-erect an existing building or to convert a building from one occupancy to another. Also known as CONSTRUCT, TO.
GOVERNMENT: The government of the People’s Republic of Bangladesh.
GRADE: The lowest point of elevation of the finished surface of the ground, pavement or footpath within the area between the building and a line which is the property line or a line 1.5 m from the building, whichever is nearer the building.
HEIGHT OF BUILDING: The vertical distance from a reference datum to the highest point of the coping or the parapet of a flat roof or to the deck line of a mansard roof or to the average height of the highest gable of a pitched or whipped roof. The reference datum shall be the elevation of the nearest footpath, or the elevation of the nearest road or street or public way at its centre line, whichever is higher.
HIGH RISE BUILDING: Any building which is more than 6 storeys or 20 m high.
OCCUPANCY OR USE GROUP: The purpose for which a building or a part thereof is used or intended to be used.
OCCUPANCY, MAJOR: The major or principal occupancy of a building or a part thereof which has attached to it subsidiary occupancy or occupancies contingent upon it.
OCCUPIER: A person paying or liable to pay rent or any portion of rent of a building in respect of which the ward is used, or compensation or premium on account of occupation of such building and also a rent-free tenant. Does not include a lodger and the words ‘occupancy’ and ‘occupation’ do not refer to the lodger. In such cases the owner himself or herself is living in his or her own building, he or she shall be deemed to be the occupier thereof.
OWNER, OF A BUILDING: The person, organization or agency at whose expenses the building is constructed or who has the right to transfer the same and includes his or her heirs, assignees and legal representatives, and a mortgagee in possession.
PERMIT: A written document or certificate issued by the Authority for carrying out a specific activity under the provisions of this Code.
PLINTH AREA: Area of a building measured at the plinth level.
PLOT: See SITE.
PUBLIC WAY: See ROAD.
RELIABLE LITERATURE: See RELIABLE REFERENCE.
RELIABLE REFERENCE: Reference materials such as published article, codes, standards or other material judged to be reliable by the professional users and specialists in the subject concerned. This may also be referred to as RELIABLE LITERATURE.
ROAD: A thoroughfare or public way which has been dedicated or deeded to the public for public use. Also known as STREET.
ROAD LINE: A line defining the side limits of a road.
ROOM HEIGHT: The clear head room between the finished floor surface and the finished ceiling surface or the underside of the joists or beams, whichever is lower.
SANCTIONED PLAN: The set of plans, design and specifications of a building submitted to the Authority as per provision of this Code and duly approved and sanctioned by the Authority.
SERVICE ROAD: A road or lane provided at the rear or side of a plot for service purposes.
SETBACK LINE: See BUILDING LINE.
SITE: A piece or parcel of land on which a building is intended to be or has already been constructed. Also known as PLOT.
SPECIALIST: A professional who by education, research, practice and experience specializes in a particular branch of a broader discipline and is generally judged to be so by the professionals in the relevant discipline.
STOREY: That portion of a building included between the upper surface of any floor and the upper surface of the floor above, except that the topmost storey shall be that portion of a building included between the upper surface of the topmost floor and the ceiling or roof above. If the finished floor level directly above a usable or unused under-floor space is more than 1.8 m above the grade, as defined herein, for more than 50 per cent of the total perimeter or is more than 3.6 m above grade at any point, such usable or unused under-floor space shall be considered as a storey.
STOREY, FIRST: The lowest storey in a building which qualifies as a storey as defined herein, except that a floor level in a building having only one floor level shall be classified as a first storey, provided such floor level is not more than 1.25 m below grade, as defined herein, for more than 50 per cent of the total perimeter, nor more than 2.5 m below grade at any point.
STREET: See ROAD.
STREET LEVEL: The elevation of the centre line of any road or street which a plot fronts.
STREET LINE: See ROAD LINE.
UNSAFE BUILDING: A building which, in the opinion of the Building Official, is structurally unsafe, or insanitary, or lacks proper means of ingress or egress, or which constitutes a hazard to life or property.
3.1 ABBREVIATIONS OF NAMES
Names of institutions, organizations and professional societies referred to in this Code are listed below in an alphabetical order.
ACI: American Concrete Institute; Box 19150, Redford Station, Detroit, Ml 48219, USA.
AISC: American Institute of Steel Construction, Inc.; 400 North Michigan Avenue, Chicago, IL 60611, USA.
AISE: Association of Iron and Steel Engineers; Suite 2350, Three Gateway Center, Pittsburgh, PA 15222, USA.
AISI: American Iron and Steel Institute; Suite 300,1133 15th Street N.W., Washington, DC 20005, USA.
ANSI: American National Standards Institute; 1430 Broadway, New York, NY 10018, USA.
ASHRAE: American Society of Heating, Refrigerating and Air-conditioning Engineers, Inc.; 345 East 47th Street, New York, NY 10017, USA.
ASME: American Society of Mechanical Engineers; United Engineering Centre, 345 East 47th Street, New York, NY 10017, USA.
ASTM: American Society for Testing and Materials; 1916 Race Street, Philadelphia, PA 19103, USA.
AWS: American Welding Society; 550 N.W. LeJeune Rd., P.O. Box 351040, Miami, FL 33135, USA.
BOCA: Building Officials and Code Administrators International Inc.; 1313 East 60th Street, Chicago, IL 60637, USA.
BSI: British Standards Institution; 2 Park Street, London W1A 2BS, UK.
BSTI: Bangladesh Standards and Testing Institution; 116A Tejgaon Industrial Area, Dhaka 1208, BANGLADESH.
BWDB: Bangladesh Water Development Board; WAPDA Building, Motijheel Commercial Area, Dhaka 1000, BANGLADESH.
CGSM: Canadian General Standards Board; Technical Information Unit, Ottawa, CANADA K1A 1G6.
FM: Factory Manual; Standards Laboratories Department, 1151 Boston Providence Turnpike, Norwood, MA 02062, USA.
ICBO: International Conference of Building Officials; 5360 South Workman Mill Road, Whittier, CA 90601, USA.
ISO: International Organization for Standardization; 1, Rue de Varembe, Case Postal 56, CH-1211, Geneve 20, SWITZERLAND.
ISSMFE: International Society of Soil Mechanics and Foundation Engineering; University Engineering Department, Trumpington St, Cambridge CB21PZ, UK.
NFPA, NFiPA : National Fire Protection Association; Batterymarch Park, Quincy, MA 02269, USA.
PDB: Power Development Board; WAPDA Building, Motijheel Commercial Area, Dhaka 1000, BANGLADESH.
PWD: Public Works Department; Poorta Bhaban, Segun Bagicha, Dhaka 1000, BANGLADESH.
RCSC: Research Council on Structural Connections of the Engineering Foundation; American Institute of Steel Construction (AISC).
RMA: Rubber Manufacturing Association; 1400 K Street N.W., Washington, DC 20005, USA.
SBCCI: Southern Building Code Congress International; 3617 8th Ave, S. Birmingham, AL 35222, USA.
SMACNA : Sheet Metal and Air Conditioning Contractors’ National Association, 8224 Old Courthouse Road, Tysons Corner, Vienna, VA 22180, USA.
SPRI: Single Ply Roofing Institute; 104 Wilmont Road, Suite 201, Deerfield, IL 600015-5195, USA.
UL: Underwriters Laboratories, Inc; 207 East Ohio Street, Chicago, IL 60611, USA.
3.2 ABBREVIATIONS OF WORDS
The abbreviations used in this Code are listed below in an alphabetical order. Abbreviations not explicitly defined herein below shall be construed to have their usual meaning as the context implies.
BDS: Bangladesh Standards; published by the BSTI
BS: British Standard; published by the BSI
CBF: Concentric Braced Frame
CGI: Corrugated Galvanized Iron
cps: Cycles per second
CWPC: Cold Drawn Low Carbon Wire Prestressed Concrete DCP: Dry Chemical Powder (fire extinguisher)
DPC: Damp-proof Course
EBF: Eccentric Braced Frame
FAR: Floor A