Warehouse Design in Bangladesh: Clear Spans, Racking Loads and Floor Slabs

Demand for modern warehousing in Bangladesh is growing with manufacturing, e-commerce and port-linked logistics. A warehouse looks simple — a big roof on columns — but its performance depends on a handful of engineering decisions made early in design.

1. Start with the storage system

Decide how goods will be stored before designing the building: floor stacking, selective pallet racking, drive-in racking or high-bay automated systems. The storage system determines the required clear height, column grid and floor loads.

2. Clear height

Every additional metre of usable height adds storage volume at relatively low cost. Clear height is measured to the underside of the lowest roof member, and must allow for sprinklers, lighting and racking clearances. Pre-engineered steel buildings make generous clear heights economical.

3. Column grid and spans

Columns interrupt racking and forklift movement. A PEB can provide wide column-free spans, but very wide spans increase steel tonnage. The optimum grid is usually set so that column lines align with racking aisles — a coordination exercise between the structural engineer and the racking supplier.

4. The floor slab is the most important element

In a warehouse, the ground-floor slab carries the loads that matter most: rack leg point loads, forklift wheel loads and stacked goods. A poorly designed floor leads to cracking, joint damage and racks going out of plumb.

• Design for point loads, not just uniform loads — rack base plates can impose high concentrated loads.
• Prepare the sub-base properly — compacted, consistent support is essential, especially on filled land.
• Control cracking with appropriate reinforcement or fibres, joint layout and curing.
• Specify flatness to suit the forklift and racking type, particularly for high-bay storage.
• Use surface hardeners for abrasion resistance in high-traffic aisles.

5. Loading docks and yards

Dock height, number of doors, canopy depth and truck turning space all need planning. Heavy vehicle yards require pavements designed for repeated axle loads, with drainage that handles monsoon rainfall.

6. Mezzanines

Steel mezzanine floors with composite decking add office, picking or packing space without extending the footprint. They must be designed for their intended loads — storage mezzanines need far higher capacity than office mezzanines.

7. Fire safety and ventilation

Large storage volumes carry high fire loads. Compartmentation, sprinkler systems where required, smoke ventilation, fire exits and access for fire-fighting vehicles must be integrated into the design from the start, in line with BNBC 2020 and fire service requirements. Roof ventilators and translucent sheets also improve working conditions in Bangladesh's hot, humid climate.

8. Plan for expansion

Warehouses often need to grow. Designing one gable end as a future expansion wall, and sizing foundations and drainage accordingly, makes extension simple later.

Try the Quick Budget Calculator with "PEB factory or warehouse" to see a first budget range for your floor area, or explore our industrial construction service.