Does IS 811 provide design guidelines for cold-formed steel?

No, IS 811 only provides dimensions, mass, and sectional properties. The design code for cold-formed steel is IS 801.

What types of sections are covered in this code?

It covers angles, channels (with and without lips), hat sections, Z-sections (with and without lips), and tubular sections.

How are sections designated according to IS 811?

They are designated by their basic shape prefix (e.g., C for Channel, LC for Lipped Channel), followed by web depth, flange width, and thickness in mm.

IS 811

: 1987

Cold Formed Light Gauge Structural Steel Sections –

CurrentFrequently UsedSpecificationBIMStructural Engineering · Structural Engineering and Structural Sections

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IS 811 specifies the dimensions, weights, and cross-sectional properties of cold-formed light gauge structural steel sections like angles, channels, Z-sections, and hat sections. Engineers and detailers use this code to select standard profiles for lightweight structural framing, such as roof purlins and wall girts.

Cold Formed Light Gauge Structural Steel Sections –

Quick Reference Values

standard delivery length6 m or as agreed with purchaser

tolerance on length+10 mm, -0 mm

thickness range covered1.25 mm to 8.0 mm

tolerance on weight+5 percent, -5 percent (for batch)

Practical Notes

IS 811 provides the geometric properties only; for the actual structural design and allowable stress calculations using these sections, engineers must use IS 801.

Always verify the availability of specific profiles and thicknesses with local manufacturers, as fabricators often roll only a subset of the sections listed in the code.

When detailing, remember that cold-formed sections have rounded corners; properties in the tables account for these standard inner bend radii.