Pre-engineered steel buildings have transformed industrial construction in Bangladesh. They are fast to build, offer large column-free spaces and adapt well to expansion. But to compare offers from different suppliers, owners need to understand what they are buying. Here are the main components and what to look for in each.
1. Primary frames
The main structure is a series of rigid portal frames, typically made from built-up I-sections that are tapered — deeper where bending is greatest (at the knees) and shallower elsewhere. Tapering puts steel only where it is needed, which is a key reason PEB is economical.
Check: frame spacing (bay size), design loads including any crane and collateral loads, steel grade and mill certificates.
2. Secondary members: purlins and girts
Cold-formed Z or C sections span between frames. Purlins support the roof sheeting; girts support the wall sheeting. They also restrain the frames against buckling.
Check: section depth and thickness, galvanising or coating specification, and spacing — thin purlins at wide spacing are a common place for cost-cutting.
3. Bracing
Rod, cable or angle bracing in the roof and walls transfers wind and earthquake forces to the foundations and gives the building stability along its length.
Check: that bracing bays are shown clearly on the drawings and that they don't conflict with doors or future openings.
4. Roof and wall sheeting
Profiled, colour-coated steel sheets form the building envelope. Options include insulated sandwich panels, translucent sheets for daylight, and standing-seam roofs for long, leak-resistant runs.
Check: base metal thickness, coating type and weight, fastener type, and details at ridges, gutters and flashings — most roof leaks happen at details, not in the sheets.
5. Anchor bolts and foundations
The frames are connected to concrete foundations with anchor bolts. These transfer large horizontal and uplift forces, so their setting accuracy and embedment are critical.
Check: who designs the foundations (the PEB supplier usually provides reactions; the civil engineer designs the footings), and how anchor bolt positions will be surveyed before casting.
6. Accessories and secondary systems
- Mezzanine floors with composite steel decking
- Crane runway beams and brackets
- Canopies, fascias and parapets
- Roof ventilators, louvres and skylights
- Gutters and downpipes sized for monsoon rainfall
Design standards
PEB frames are typically designed to AISC specifications and Metal Building Manufacturers Association (MBMA) practice, with loads — dead, live, wind and seismic — determined according to BNBC 2020 for Bangladesh sites.
Comparing PEB offers
Two quotations with different prices may simply describe different buildings. Ask every supplier for the same information: design loads, total steel tonnage by component, sheeting specification, and exclusions. Compare kilograms of steel per square metre — an unusually low figure may mean lighter design loads or thinner secondary members.
Use our Quick Budget Calculator for a first budget range for your PEB, or learn about our industrial construction service.
About Md. Saroar Hosen
Civil Engineer, Prime Base Engineering, B.Sc. in Civil Engineering (EUB), PGDSCM (ISCEA). Md. Saroar Hosen leads Prime Base Engineering and reviews the structural assessment, retrofitting and construction work the firm delivers.
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