Rules from BNBC

Aug 18, 2020 Shawlin .net

Tags architecture portfolio, architecture portfolio of shawlin islam, architecture student, Autonomous Vehicles, bangladesh national building code, BNBC, design of a warehouse, difference between, dimensions, dock shelters, fire codes, Fire compartmentalization, Fire Compartmentation, Fire safety and workplace design considerations, fundamentals, fundamentals of warehouse design, goods handling methods, history of, industrial truck, modern warehouse, online grocery shopping fulfilment centre, online portfolio, order fulfilment storage warehouse, Overseas warehouses, Planning for fire control, Rules from BNBC, shawlin islam, Storage efficiency, thesis projects, time saver standards, traditional warehouse, types of warehouse architecture, types of warehouse buildings, Warehouse architecture design, Warehouse building types, warehouse design, warehouse logistics, workplace design considerations

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.

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

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

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)

Pedestrian Path or walkway

An uncovered paved path that links building and the approach road shall not be included as floor area of building.
The walkways should not be used for any other purpose than pedestrian movement and accessibility route.
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
Any changes in elevation in accessibly route, shall comply with provisions of Universal accessibility.

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

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.

Height limitations based on road width

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 m²area 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