bangladesh national building code 2012 pdf free download

bangladesh national building code 2012 pdf free download

Let's Change The World Together. Pdfdrive:hope Give books away. Get books you want. Ask yourself: Do I enjoy my own company? Can I be alone without feeling lonely? However, in special cases where the design of a structure or its components cannot be covered by the provisions of this code, other relevant internationally accepted codes referred in this code may be used.

Compliance Solution Desk. Download PDF File. Email This BlogThis! Share to Twitter Share to Facebook. Side and Rear Separation distances 1. The requirement of separation distance for the remaining sides shall remain unchanged.

Residential Detached, Higher than 10 stories or 33 m Institution for care Educational, Assembly Business and Mercantile Not higher than 10 stories or 33 m semidetached Business and Mercantile Not higher than 10 stories or 33 m Detached Business and Mercantile d Higher than 10 stories or 33 m semi-detached Business and Mercantile Higher than 10 stories or 33 m Detached Industrial Storage Hazardous.

As permitted for this occupancy As permitted for this occupancy Any Any. As permitted for this occupancy As permitted for this occupancy As permitted for this occupancy.

As per provisions of this code As per provisions of this code As per provisions of this code. Note : a The two dimensions separated by comma stands for each of side separation distance of a semi-detached development. This gap is not required if the adjoining plots are consolidated and built monolithically. An area having proper dimensions as per provision of this code and open to the sky from the formation level and surrounded by a building or buildings or walls or combination thereof shall be designated a Courtyard.

Area of a Courtyard shall be measured from clear cross-sectional dimensions. In relation with height of the surrounding building or buildings the area shall not be shaded more than two third duringthe mid-daylight.

When a courtyard is fully surrounded by a building shall be designated as an Interior courtyard or a close courtyard.

A courtyard has exposures to the outer air. Sum of the exposures shall be at least thirty percent of its peripheral length shall be designated as open courtyard. The interior courtyard shall have the minimum dimensions depending on the height of the building as specified in Table 3. The shorter side dimension of such interior courtyard shall not be less than one-third of the longer side dimension.

For buildings over 20 storeys high, the size of the interior courtyard shall not be less than the square of one-third the height of the tallest wall abutting the courtyard.

Any such construction shall comply with Sec 1. No such construction permitted in the open space shall be higher than 2. No window, door or ventilator shall be placed on any wall adjacent to the abutting plot or street.

Entrance to the garage orsloping drivewayshall not be directly from a public road or street. Distance between the entrance to a garage or a sloping driveway and the plot line adjoining the road shall be kept at least 2. Drainage from the roof or any other part of such construction shall not be allowed to discharge into the adjacent property. Drainage from any part shall not discharge directly into the street through spouts.

No structure or room shall be constructed over the garage or any other permitted service structure within the limits of the mandatory open space. The roof of any such construction permitted in the mandatory open space shall not be used as a balcony or a terrace or in any such manner that would interfere with the privacy of the occupants of the adjacent property.

No toilet, generator room or electrical substation shall be constructed adjoining the abutting property or street. Up to 3 4 5 6 7 8 9 10 11 Such extensions shall not be accessible from the building at any level.

The construction of a roof or a cornice shall be as such that rain or other water shall not fall from there into the adjacentplot or street. The top surface of such canopy shall not be used as a balcony and shall not be accessible from the building. Balcony shall be constructed as per provisions of this code. Lifts of adequate size, capacity and number as per provisions of this code.

Adequate fire protection and firefighting arrangements shall be as per provisions of this code. For buildings in the vicinity of airports or aerodromes, the height shall be limited by the requirements of the civil aviation authority, city or area development authority or other concerned agencies of the Government. Where more than one construction type permitted within a building as per provision of this codeamong them the lowest fire resistance rated construction type shall be applicable for FAR allotment,and lowest fire resistance rating shall be applicable for the whole structure.

Fire separation distance in terms of building setback and buildingoccupancy type and construction type shall governthe FAR to restrict fire hazard volume. FAR shall be decided by the development authorities having jurisdiction. For Occupancy for which unlimited FAR is permitted, the minimum open space requirements specified in Table 3. For the purpose of calculating FAR, the area of any floor including basement, of which at least two-third is used exclusively for car parking and the remaining one-third is used for purposes such as mechanical plant room, electrical substation, security cabin, reception booth, water tank, pump house, stairs and lifts, which are accessory to the main occupancy, shall be excluded from the calculation of the total floor area of the building.

For area with high public transport accessibility and high FAR the requirement for residential private parking should not be more than one car for every four dwellings. Off street parking requirement for a building or an area shall be decided by the development authority having jurisdiction. Sloping drivewaysteeper than 1 vertical to 8 horizontal shall not be credited as a walking ramp. When a sloping surface used for both driveway and walking ramp shall be demarked and the minimum width and sloping ratio of walkways shall be as per provisions of this code.

Sloping driveway entering below grade level shall be protected to prevent water flow into any level that they lead to. Below Grade: The footing of the boundary wall adjacent to the street may encroach the street land not more than 0. Above Grade: Marquee, canopy or other temporary projection of cantilever type from buildings of business and mercantile occupancy may project on the footpath of a road, provided that no part of such projection is below a height of 3 m from the footpath level and that the outer edge of the canopy is at a minimum clear horizontal distance of 0.

The canopy shall be so constructed as to be readily removable without endangering the building structure. No canopy shall project into a street without a footpath. Under no circumstances shall the top of the canopy be used by any floor of the building.

The plinth and formation levels of the building and the plot shall conform to the requirements ofSec 1. A maximum of one-third of the floor area of such habitable rooms may, however, have a minimum ceiling height of 2.

For airconditioned rooms in such buildings, the minimum ceiling height shall be 2. In the case of pitched roof without a horizontal ceiling the lowest point of the finished ceiling shall be at least 2 m above the finished surface of the floor and the average height of the ceiling shall not be less than 2.

The minimum clear head room under the ceiling, folded plate, shell etc. The minimum clear distance between the floor below and the soffit of a beam shall not be less than 2. Industrial, Storage, Hazardous.

Sleeping room size of a dwelling unit shall not be less than 9. Other non-habitable rooms in the dwelling unit shall have a minimum area of 5 m with a minimum width of 2 m. The minimum clear height of kitchen shall be 2. The minimum floor area of a kitchen which is intended to provide dining or occasional sleeping space shall be 7. The waste water shall be discharged into the waste water pipe or drain. Every such bathroom or toilet shall have a door completely shutting it off from the exterior.

Such interior lighting and ventilation shafts shall have the minimum dimensions specified in Table 3. In addition, shafts for buildings exceeding 6 storeys or a height of 20 m shall be mechanically ventilated. All shafts must be accessible at the ground floor level for cleaning and servicing purposes.

Shaft dimensions shall conform to mechanical design considerations. All bathroom walls or partitions shall be treated with nonabsorbent water repellent smooth impervious finish material to a height of not less than 1 m above the finished floor level. The floor shall be sloped gently towards gratings or openings of the floor traps. Each dwelling unit shall have atleast one adaptabletoilet. All Risers and Treads shall be identical in consecutive two flights starting from one floor to another floor.

Difference between two consecutive risers or treads shall not be more than 5mm. For Assembly occupancy maximum flight height between landings shall not be more than mm.

The clear head room may be reduced to 2. The minimum clear height of all other passages and spaces below a landing shall be 2. A store room provided in a dwelling unit of a residential building shall have a minimum area of 1. The clear height of the store room shall not be less than 2. Private garagein a residential building shall have a minimum clear height of 2. The minimum area of the parking stall in a garage shall not be less than 23 m2.

Subject to the provision of Sec 1. The walls and floors of the basement shall be damp-proof and water-proof as per provision of this code. The basement shall be protected against surface and waste water intrusion. The staircases of a building serving above grade level also entering into below street floor level shall be enclosed bybarrier wall with two door smoke proof vestibule shall have minimum 2 hours fire resistance time of.

All buildings shall have a covered entrance or other covered area for callers waiting at the door. The main entrance door to the building shall not open into an uncovered exterior.

All public buildings shall have universal accessibility as per provisions of this code. The roof of a building shall be constructed in such a manner that rain water is drained freely away from the building without causing dampness of the roof or the walls of the building or of an adjacent building.

For one or two storey buildings with flat or pitched roof, rain water may be discharged directly to the ground, in which case the roof shall have extended eaves or cornices to direct the water away from the walls.

For other buildings, gutters or parapets shall be provided to direct the water to the piping of an adequate rain water drainage system. The roof shall be impermeable or shall be treated with an impervious material to make it effectively water tight.

Flat concrete roofs shall be topped with an impervious layer of lime concrete or other effective means of waterproofing. All flat. All accessible flat roofs shall be enclosed by parapets or guardrails having a height of at least 1 m.

All such parapets and guardrails shall be designed to withstand the lateral forces due to wind and occupancy in conformity with the provisions of Part 6 of this Code. A septic tank shall be provided within the premises for disposal of sewage, whether any public sewer is available or not.

The location, design and construction of the septic tank shall conform with the requirements of this Code. Plantation of trees and shrubs within the open spaces of a plot aimed at enhancing the environmental quality of the building shall comply with the requirements of this section.

Trees and shrubs shall be planted judiciously to meet the requirements of shade and sunshine, to control noise and dust, to provide privacy and to improve visual quality, without jeopardizing natural ventilation and lighting of a building. Species of trees shall be so chosen and planted that their roots do not endanger the building foundation and their branches do not interfere with the building superstructure.

This shall be achieved by maintaining sufficient distance between the trees and the building depending on the species of the tree. Additions or alterations to such existing buildings or change of use thereof shall not be permitted if such addition, alteration or change of use or occupancy is likely to render the building more hazardous with respect to fire safety, life safety and sanitation than it was before. The building together with the additions and changes shall not exceed the height, area and open space requirements for new buildings specified in this Code.

To determine compliance with this Ventilation of bathrooms may also be achieved through ventilation shafts as provided for in Sec 1. Air flow on cooking range shall be restricted. An enclosed staircase shall have windows not less than 1 m in area on exterior walls of every landings as per provisions of this code. Toilet and bathroom windows shall open to the exterior or an approved ventilation shaft and the openable area shall not be less than 1 m.

Such openings however, shall not be credited towards meeting any ventilation requirements. When part of a window area is made of fixed glazing, only the openable portion shall be counted in aggregating the opening area. The requirement of lightning protection systems shall be assessed and they shall be designed and installed in accordance with the provisions of Chapter 2 of Part 8.

Any chemical used for the control of rats and termite shall be free from environmental hazards. Periodic inspections shall be undertaken for effective protection against rats and termites. The planning and development control authority of the city, township, municipality or region where this Code is intended to be applied shall delineate any area having a potential for being flooded under at least 1 m deep water due to flooding as Flood Prone Area FPA.

The provisions of Sec 1. There shall be a design flood level in the FPA's which shall be recommended by the Authority to be used in interpreting the provisions of this section. Similar delineation shall be made in the coastal regions on the basis of expected occurrence of a surge or wave run-up of 1 m or higher.

There shall be a design surge height in the SPA's which shall be recommended by the Authority to be used in interpreting the provisions of this section. Buildings up to two storeys high shall haveaccessible roof with an exterior stair. Buildings having three storeys or more height, the floor immediately above the design flood level shall be accessible with an exterior stair.

Exceptions: a. Except for Occupancy A Residential , any occupancy may have floors below the design flood level in accordance with the provisions of Sec 1. Floors which are used only for building access, exits, foyers, storages or parking garages may be located below the design flood level in accordance with the provisions of Sec 1.

Bangladesh National Building Code There shall be vents, valves or other openings in the walls of the enclosed spaces which shall equalize the lateral pressure of the water. The bottom of such openings shall not be higher than mm above the finished grade. There shall be at least one opening for each enclosure in a building but the total number of such openings shall be at least two.

The total net area of openings for an enclosure shall be at least 0. Floors and exterior walls of such floors shall have a construction impermeable to the passage of water. Structural components of such floors shall be capable of resisting the hydraulic and buoyant forces resulting from the occurrence of floods at the design flood level.

Design requirements in such cases are specified in Chapter 1, Part 6. Vents, openings and valves provided below the design level shall have water-tight closures capable of resisting any structural forces resulting from the occurrence of the design flood. Penetrations made for electrical, mechanical or plumbing installations shall be made water-tight to prevent any penetration of flood water. Sewerage systems having opening below the design flood level shall have a closure device to prevent backwater flow during the occurrence of floods.

For buildings of height two storeys or less the roof shall be accessible with an exterior stair. For buildings three storeys or higher, the floor immediately above the design surge level shall be accessible with an exterior stair.

Exception: Footing, mat or raft foundations, piles, pile caps, columns, grade beams and bracings may be constructed below the design surge height. Exception: Structural or non-structural members serving as entries or exits may be constructed below design surge height. If piled foundations are used, they shall be designed to withstand with adequate factor of safety the loss of support due to scour. Design of the foundations shall conform to the requirements of Chapter 3, Part 6.

This shall apply for all buildings to be constructed in hilly areas where there is the danger of failure of slopes, including mudslides, flash floods and soil erosion. Such failures may occur in hilly areas, where the angle of slope is greater than Prevention of failure of slopes shall be achieved by the following measures: a Retaining walls to prevent soil erosion as per provisions of Part 6 of this code. Some of these classes are subdivided into divisions also.

The numerical order of the classes or divisions is not the representative of the degree of danger. These classes including their divisions are listed below: Class 1: Explosives Division 1. Division 1. Class 2: Gases Class 2. Class 5. Utilities under Occupancy L is incidental to operation in all other type of occupancy except Occupancy J shall be considered as non-separated use of the main occupancybut shall be taken special safety measure as per provision of this code.

Any occupancy or use type not mentioned specifically inTable 3. Each occupancy group shall be subdivided as detailed in the following sections. The detail classification including mixed occupancy provided in the Table 3. If there is any use or character of occupancy in a building which is not mentioned here, it shall be classified as per provision of sub-section 2.

This occupancy type shall include any building or portion thereof providing sleeping and living accommodations to related or unrelated groups of people, with or without independent bathroom,. This Occupancy shall be subdivided as follows: 2. These shall include any building, row type or semi-detached or detached from neighboring buildings by distances required by this Code and having independent access to the plot, which is used as private dwelling by members of a single family.

These shall include any building, row type or semi-detached or detached from neighboring buildings by distances required by this Code and having shared or independent access for two families and having facilities for living, cooking and bathroom facilities independent of each other. These shall include any building or portion thereof which is provided for more than two families, having facilities for living, cooking and bathroom facilities independent of each other.

These shall include any building or portion thereof in which sleeping, living accommodations and bathroom are provided for groups of related or unrelated persons, with or without common dining and facilities, and with common cooking under single management control or with individual or group cooking facilities. These shall include any building, a portion thereof or group of buildings under single management, in which sleeping, living accommodation and bathroom facilities are provided with or without dining facilities but without cooking facilities for adult individuals, is provided for hire on transient or permanent basis.

This occupancy type shall include any building or portion thereof in which education, training and care are provided to children or adults. These shall include any building or portion thereof used for purposes involving assembly for instruction, education and recreation of more than six persons on regular basis to fulfill the requirement of an academic curriculum approved by the Government up to H.

C 12th Grade , and which is not covered by occupancy I. These shall include any building or portion thereof used for purposes involving assembly for instruction, education, training and recreation of more than six persons, and which is not covered by occupancy I and B1.

These shall include any building or portion thereof used for purposes involving care, recreation and education of children more than six in number, who have not yet reached the age to attend the school.

Buildings classified under this occupancy shall include those used for purposes of institutional care of the occupants, such as detention for correctional or penal purposes, medical or nursing care of persons suffering from illness or infirmity due to mental condition, or accommodation of children or minor, where the personal liberty of the inmate is restricted. These buildings shall ordinarily provide accommodation for sleeping, dining and other provisions approved by the authority for the occupants.

This occupancy shall be subdivided as follows: 2. These shall include any building or portion thereof or group of buildings under single management used as an institution for the full time care of children or minor, each providing accommodation for sleeping, dining and other provisions approved by the authority for more than six children.

These shall include any building or portion thereof or group of buildings under single management used for purposes of full time care and custody of adult or mentally disabled persons but physically capable of responding to emergency. These shall include any building or portion thereof or group of buildings under single management used for purposes of full time care and custody of persons physically or mentally incapable of responding to emergency.

These shall include any building or portion thereof or group of buildings under single management used for housing children under restraint, or who are detained for penal and corrective purposes, in which personal liberty of the inmates is restricted.

These shall include any building or portion thereof or group of buildings under single management used for housing persons under restraint, or who are detained for penal and corrective purposes, in which personal liberty of the inmates is restricted. Buildings under this Occupancy group shall include those used for purposes of providing medical care, diagnostic facilities and treatment to persons suffering from physical discomfort, in which sleeping accommodation may or may not be provided.

These shall include any building or portion thereof or group of buildings under single management in which essential medical facilities having surgery, emergency and casualty treatment facilities, general or specialized medical and other treatment is provided to persons suffering from physical discomfort.

These shall include any building or portion thereof used for purposes of providing essential medical facilities having surgery, emergency, casualty treatment facilities, general or specialized medical and other treatment is provided to persons suffering from physical discomfort.

This Type shall be equipped and designated to handle post disaster emergency, by construction it is required to remain operational during and after disasters, built as a part of disaster preparedness program. These shall include any building or portion thereof which is used for any business transaction other than mercantile. These shall include any building or part thereof which is used for paper works, documentations,only display of samples of Products but notfor direct sale, maintaining accounts and records for administrative or consulting services, banking or activities for business purposes and professional training.

These shall include any building or portion thereof used for purposes of providing emergency services and utilities which are required to remain operational during and after a disaster or other emergency situations. These shall include any building or portion thereof with an area divided or undivided not exceeding m, used for purposes of display and sale of merchandise, either wholesale or retail, with or without incidental storage and service facilities.

These shall include any building or portion thereof with an area divided or undivided more than m used for purposes of display and sale of merchandise, either wholesale or retail, with or without incidental storage and service facilities.

These shall include any building or portion thereof used for providing refueling and maintenance without repair services for automobiles which is moderately hazardous in nature. The hazard shall generally mean the relative danger of the start of fire and the rapidity of its spread, the danger of smoke and gases generated that pose a potential threat to the safety of the occupants of the building. Unless areas with different degrees of hazard are effectively segregated and separated in accordance with the provisions of this Code, the most hazardous area in a building shall govern its classification.

This occupancy shall also include facilities for public utility services at the producer or distributors end that deals with generation and distribution of utility facilities. Any such building or portion thereof, which is not.

These shall include any industrial building in which the contents are of such low combustibility and the processes conducted therein are of such low hazardous nature that danger of self-ignition and self-propagation of fire is nonexistent, the only danger being an onset of fire from external sources with the resulting danger to life and property.

These shall include any industrial building in which the contents are moderately combustible and the industrial processes conducted therein are liable to give rise to a fire which will spread with moderate rapidity, giving off considerable smoke. Any such building or portion thereof, which is not used for storing hazardous material quantified and categorized in occupancy group J, shall be subdivided as follows: 2. These shall include any building or portion thereof which is used for storage of materials or other contents which do not constitute the danger of self-ignition, and in the event of fire the rate of burning shall be less than moderate rapidity.

These shall include any building or portion thereof which is used for storage of materials which do not constitute the danger of self-ignition but which in the event of fire will burn with moderate rapidity.

Items which shall be deemed to render a building hazardous are specified in Sec 2. This occupancy shall include a building or a portion thereof for assembly in a space provided with fixed seats for or more persons.

Assembly buildings under this subdivision may be for theatrical, operatic performances or cinema projection having or not a raised stage, proscenium curtains, scenery loft or projection screen, lighting equipment, projection booth and necessary theatrical and mechanical equipment. This occupancy type shall include any building or portion thereof primarily meant for use as described for buildings under Occupancy I1, but with fixed seats for less than persons in a space.

These assembly buildings may or may not be provided with a legitimate theatrical stage or related accessories or equipment. This occupancy type shall include any building or portion thereof for assembly in a space, in which there are no fixed seats, which may or may not be provided with a legitimate stage or theatrical accessories, and which has accommodation for or more persons. This occupancy type shall include any building or portion thereof primarily intended for use as described in Occupancy I3, but with accommodation for less than persons in a space.

This occupancy type shall include any building or portion thereof meant for assembly of spectators for recreational and amusement purpose mainly related to sports. Definition of hazard and the amount of such materials which shall be deemed to render a building hazardous are set forth in Sec 2.

These shall include any building or portion thereof which is used for storage, handling, processing or manufacture of explosive materials and products that have explosion hazard. These shall include any building or portion thereof which is used for storage, handling, processing or manufacture of materials and products that are highly corrosive, toxic, poisonous and physically harmful including corrosive and toxic alkalis, acid or other liquids or chemicals, producing flame, fumes, radiation, and explosive, poisonous, irritant and corrosive gases.

These shall include any building or portion thereof which is used for storage, handling, processing or manufacture of materials and products that use biological processes and in which the risk of harmful biological threat to the occupants exist. These shall include any building or portion thereof which is used for storage, handling, processing or manufacture of materials and products that use nuclear and radioactive processes and in which the risk of radioactive contamination exists.

This occupancy type shall include any building or portion thereof used solely for parking Motor Vehicles for a limited period of time. This occupancy type shall include any building or portion thereof used as store of owner's or tenant's Motor Vehicles for private use for unlimited period of time. This occupancy type shall include any building or portion thereof wherein repair of electrical or mechanical system or denting or painting works of body is performed on any type of vehicles and includes associated floor spaces used as office, showrooms, incidental store and parking.

This shall also include all public and private utility facilities of the consumers end that are located within the consumers site and all installations are required special care to ensure life and property safety as per provisions of this code.

These Occupancies shall be subdivided as follows: 2. Any building or structure which is neither listed in the A-Z list nor covered in any occupancy groupprovided in this code but unique in character may be categorized in this occupancy by the Board of Appeals. Each and every individual M1 Structure shall be complied with NFPA or equivalent standards for the life and fire safety. M2: Fences, Tanks and Towers These shall include fences and boundary walls over 1.

Such changes shall be permitted only when the land use and the building complied with the provisions of this Code and the laws of the land for such group of Occupancy.

Mixed Occupancy The following occupancies shall not be required to designate as a separated occupancy classification from uses to which they are accessory any occupancy Group other than Occupancy Group J a. The administrative and clerical offices and similar offices not exceeding 25 per cent of the floor area of the major occupancy and not related to Hazardous Buildings as defined in Occupancy J.

Administrative offices, gift shops and other similar uses in Occupancy A provided the uses do not exceed 10 per cent of the floor area of the major occupancy. Kitchens associated with a dining area. Carports having at least two sides entirely open associated with Occupancy A. A building is permitted to have multiple occupancytype, each type of occupancy shall be in groups, which may have combination of different occupanciesand shall be separatedhorizontally or vertically or bothaccordingly as specified in the Table 3.

However, in special cases where the design of a structure or its components cannot be covered by the provisions of bangladesh national building code 2012 pdf free download code, other relevant internationally accepted codes referred in this code may be used. Compliance Solution Bbuilding. Download PDF File. Email This BlogThis! Share to Twitter Share to Facebook. Newer Post Older Post Home. Bangladesh national building code 2012 pdf free download October 3, at AM. Asif Iqbal November 2, at AM. Subscribe to: Post Comments Atom. Social Profiles. Popular Tags Blog Archives. Bangladesh Labour Law Amendment BLL Amendment Resign Letter for worker. Appointment Letter For Staff in Bangla. Download Excel File. Customs and Border Pro bangladesh national building code 2012 pdf free download Bangladesh National Building Code: (BNBC Draft) - Free ebook download as PDF File .pdf), Text File .txt) or read book online for free. the Bangladesh National Building Code (BNBC) was first published in Any chemical used for the control of rats and termite shall be free from environmental. Download Embed Report may be cited as the "Bangladesh National Building Code", abbreviated, where ward is used, or compensation or premium on account of occupation of such building and also a rent-free. Bangladesh National Building Code Building material, fence, shed etc. shall not obstruct free access to any fire hydrant, lamppost, manhole, fire alarm. Bangladesh National Building Code in English. BNBC Code. Bangladesh National Building Code Free Download. BNBC Code for. Being Mortal: Illness, Medicine and What Matters in the End. Pages··​ MB·66, Downloads. Atul_Gawande_Being_Mortal_Illness. 1, Pages·· MB·11, Downloads·New! In the then current European national standards for building and construction were replaced. Bangladesh National Building Code (BNBC): Chapter Steel-Conctrete, Composite Structural Members. Download. Bangaldesh National Building Code​. Name of Codes: Bangladesh National Building Code (BNBC). Earthquake Resistant Design part of the code is attached as pdf file. in English. in Original. A space should have relatively lower reverberation time for speech. A stage shall be further classified as legitimate stage, regular stage and thrust stage. However, in special cases where the design of a structure or its components cannot be covered by the provisions of this code, other relevant internationally accepted codes referred in this code may be used. The openings shall be protected with a fire resistance assembly doors or windows providing fire resistance of at least three hour. This shall include sound pressure level, reverberation time and diffusion of sound. Maximum height of display or storing of merchandises shall not be exceeded mm or mm respectively. A sound reduction of about 45 dBA between the consulting and the waiting rooms shall be provided in order to weaken the transmission of sound. In any case the ceiling height and the head room clearance of a production floor shall not be less than 3. Design of concrete structure 14th edition PDF. Details of such types of construction are set forth in chapter 3 of this part. Cutting, fleshing and stuffing. Anuncoveredpaved pedestrian that links buildings and the approach road shall not be included as a floorarea of a building. Usually, a time lag of at least 50 to 80 ms is required for hearing discrete echoes. bangladesh national building code 2012 pdf free download