warehouse-design

Rules from BNBC

 Topics covered in this study
1.  Occupancy Classification
2.  Plot selection criteria
3.  Clearance from overhead electric lines
4.  Boundary wall allowable height
5.  Internal access road
6.  Pedestrian path or walkway
7.  Side and rear separation distances
8.  Internal courtyard size
9.  Permitted construction in mandatory open space
10. Height limitations based on road width
11. Specified requirements for parts of industrial buildings
  • Minimum Ceiling heights for different occupancies
  • Kitchen, Toilets
  • Stairway dimensions, mezzanine floors
  • Lofts, cabins, store room, private garage, basement
  • Entry approach, roof drainage, parapet, septic tank
12. Landscaping
13. Damp proofing and waterproofing of floors and walls
14. FIRE PROTECTION- Occupant load factor, capacity of exit components
15. Corridors and passageways, doorways
16. Stairways
17. Horizontal exits, number of exits and travel path distance
18. Smoke proof enclosure
19. Means of exit signs and illumination
20. Fire Resistance rating of common construction elements

 

Definition of Industrial building: Factories and other premises used for manufacturing, altering, repairing, cleaning, washing, breaking-up, adapting or processing any article; generating power or slaughtering livestock.

These buildings may also be storage and handling of raw or finished materials or goods.

  1. Classification of Industrial Warehouse

Bangladesh National Building Code (2015) Volume 1- Chapter 1, Part 3, Pages 3 to 5, House building and Research Institute

 

 

Table 3.1.1 – Occupancy Classification

 

2.Plot Selection criteria:

Site Selection: Water logging free. Abandoned site with refuse deposit should be avoided. Excreta or other material free site.

Provision of any vacant space within plot: Effectively drained by surface or underground drainage system.

Sanitary waste disposal facility: Required utility service authority’s written approval.

Plot size: At least 300 m2 with road frontage width ≥ 15m

 

  1. Clearance from overhead electric lines

A building or any part of it shall not be erected within the distance shown in the Table 3.1.3 from any overhead electric line.

 

 

4. Boundary wall allowable height

If boundary wall is higher than stated below, special permission will be required.

If boundary wall is:

1.    Solid

Max height 1.5 meters

No permission required

2.    Open (grilled, jail, balustrade)

Max height 2.75 meters

No permission required

3.    Combination of 1 and 2 above

Max height  of solid part is 1.5 meters

No permission required

 

  1. Internal Access road

 

International road:    set back ≥ 250 mm from boundary wall or property line

Approach road:           ≥ 9 m wide

Pedestrian walkway: width ≥ 1.0 m (not enclosed by adjacent walls on both sides)

                                    width ≥ 1.25 m (if enclosed)

  1. Pedestrian Path or walkway
  1. An uncovered paved path that links building and the approach road shall not be included as floor area of building.
  2. The walkways should not be used for any other purpose than pedestrian movement and accessibility route.
  3. The minimum width of pedestrian path shall not be less than the calculated width of the connected corridor or passage. If pedestrian paths are enclosed by adjacent walls on both sides, the minimum width shall be 1.25m
  4. Any changes in elevation in accessibly route, shall comply with provisions of Universal accessibility.

  1. Side and Rear separation distances

In a corner situation where two frontages of a plot intersects each other and form a sharp corner a turning clearance with a minimum radius of 2m shall be required as per guidelines of figure 3.1.3. No construction or visual obstruction shall be allowed within such turning clearance space. 

 

 

Minimum rear and Side open space Requirements of a plot.

Rear

≥ 3.0 m

Side

≥ 3.0 m

 For any plot size (m2):

Separation of building in the same plot:

Open space requirement between adjacent buildings in the same plot in different layout.

 

 8. Courtyard or Internal Courtyard size

  1. Permitted construction in mandatory open space:

Not higher than 10 storey or 32 m- Maximum 1/3 x mandatory exterior open space

If higher than 10 storey:

  • No construction higher than 2.75 m from formation level.
  • No door, window, ventilator on any wall adjacent to the abutting property or street.
  • No direct entrance to garage from road. Minimum 1.5 m distance between entrance to the garage and property line adjoining the road.
  • No discharge from roof directly to adjacent property or street.
  • No structure or room over garage or other permitted service structure.
  • Roof of any construction in mandatory open space cannot be used as balcony or terrace.

Extensions:

Roof or cornice into mandatory open space

0.5 m

Shading device

Max. 0.75 m, at least 2.5 m above formation ground level.

Cantilever canopy

At least 2.5 m above formation level

Clearance between Edge of canopy and property line= 1.5 m

Balcony level

Higher than 6 m and may project not more than 9 m

Underground construction

Water reservoirs, septic tanks, inspection pits, sewer line- project max. 150 mm above formation level.

 

  1. Height limitations based on road width

  1. Specified requirements for parts of industrial buildings

Minimum Ceiling heights for different occupancies

Kitchen

Clear height

≥ 2.75 m

Clear height (if mechanical exhaust present)

≥ 2.15 m

Floor area

≥ 4  m2

Width

≥ 1.5  m

Window area

≥ 1  m2

 

Toilets

Clear height

≥ 2.15 m

Width

≥ 1  m

Floor area

·         WC and bathing

·         Without WC

·         With only WC

·         3 fixture bathroom (bathing, washing, WC)

 

≥ 2.8  m2

≥ 1.5  m2

≥ 1.2  m2

≥ 3  m2 area and width ≥ 1.25  m

 

 

Stairway dimensions

  • Width ≥ 2.15 m
  • Riser height and tread depth = 400mm to 425mm
  • Clear head room between flights of staircase ≥ 2.15 m
  • Clear height of any passage below landing providing access to non-habitable and service space ≥ 2.03 m
  • Clear height of all other passages and spaces below landing ≥ 2.15 m
  • Handrails height ≥ 0.9 m

Continue to Part 2: Rules from BNBC: FIRE PROTECTION

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A breakdown of all the studies have been compiled in my Warehouse design blog

For convenience, I here are direct links to all the Research topics with proper reference.

  1. Introduction to modern "Bazaar"
  2. Literature Synthesis and Typology of warehouses
  3. Why the 19th century warehouse did not sustain? History
  4. Case Study of- A warehouse with over 3000 orders a day
  5. Site Analysis of Tejgaon Industrial Area/ Development Trend of Tejgaon Industrial Area/ Number of plots and their floor area
  6. Defining site and its surroundings according to theories of Kevin Lynch/ Site Location/ Site Area etc.
  7. Site surroundings, Location of electric poles and existing site images
  8. Project Programme
  9. Difference between traditional and modern Warehousing
  10. Fundamentals of Modern Warehousing
  11. Warehouse building types
  12. Warehouse and the Industrial Revolution
  13. What is Industry 4.0?
  14. Storage efficiency with various handling methods
  15. Industrial truck (forklift) dimensions
  16. Autonomous Vehicles in warehouse logistics
  17. Industrial Pallets, Standard pallet patterns and Standard Pallet sizes
  18. Loading Bay sizes, planning and Layout criteria
  19. Planning for fire control and Fire compartmentalization
  20. Amenity and Hygiene/ Washing and toilet facilities/ workplace design considerations
  21. Rules from BNBC Part I
  22. Rules from BNBC Part II Fire Protection
  23. List of flammable items/ Combustible dust dangers in a grocery warehouse
  24. Rat proofing/ Termite proofing in industrial buildings
  25. Industrial Shelves
  26. Field Survey
  27. Design Documents: FAR Calculation and Building code (RAJUK)
  28. Concept info graphic, Massing diagram and Volume Analysis

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Read the Next Article: Rules from BNBC Part II Fire Protection

Read the Previous Article: Amenity and Hygiene/ Washing and toilet facilities/ workplace design considerations

Link to Full portfolio: https://shawlin.net/blogs/architecture-portfolio


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