Cold Roll Service

Cold roll forming shapes steel coil into a structural section at room temperature, by passing it through a series of rollers rather than by heating and rolling it. The process work-hardens the steel, so a thin section achieves a useful strength-to-weight ratio. C and Z purlins, girts and light framing members are made this way.

Cold formed sections are thinner and lighter, which suits light to medium loads and shorter spans, and makes the structure cheaper to transport and erect. Hot-rolled sections carry heavier loads over longer spans. The design considerations also differ: cold formed members are governed by local buckling of thin elements, so section shape matters as much as thickness.

Light industrial sheds and workshops, warehousing with moderate loading, agricultural and poultry buildings, godowns, canopies and covered storage, and secondary framing inside larger structures. They suit buildings where the loads are modest and speed and cost matter more than heavy load capacity.

Low structural weight, which reduces both foundation cost and erection plant; dimensional consistency, because sections are rolled to a precise profile; fast erection, since members are light enough to handle without heavy cranage; and efficient material use, as the profile is rolled to the length required with little waste.

Typically 0.8 mm to around 3 mm for cold formed structural members, with industrial roof purlins commonly between 1.6 mm and 2.5 mm. The right thickness follows from span, spacing and loading. A deeper section in the same thickness carries considerably more, which is why specifying by thickness alone is a mistake.

Yes. The in-house Z and C purlin mill rolls sections to the project’s requirement rather than to stock sizes, so purlin depth, thickness and spacing can be optimised against the actual roof loading. On a large roof that is a meaningful saving, because secondary steel is a substantial share of total tonnage.

Yes, provided the coating specification matches the exposure. Because the sections are thin, corrosion protection matters proportionally more than it does on heavy steel — the same rate of loss removes a larger share of the section. Galvanised coil and appropriate coatings, with sealed laps and correctly specified fasteners, are what deliver the design life.

Light crane provision can be accommodated where it is designed in from the start, but heavier cranes call for a hot-rolled or built-up primary frame, with cold formed members used for secondary framing. As always, the crane capacity, hook height and duty class must be fixed before engineering begins.

Faster than an equivalent heavy steel building, because members are light enough to handle without major lifting plant and connections are bolted. For a standard building, fabrication and erection typically run to a few weeks once the design is approved and foundations are ready. Design approval, not erection, usually sets the completion date.

For light industrial and storage buildings, costs sit at the lower end of the general PEB range, an indicative ₹1,400–1,800 per sq ft depending on span, height and envelope specification. These are indicative planning estimates rather than quotations. Clear height and span remain the dominant cost levers.