Sigma Purlin

A cold-formed galvanised steel purlin whose web is stepped in the middle into a sigma shape, with a flange and a hooked lip at each end, for roof and wall spans between frames; an eaves version tilts its top flange to the roof slope.

Details

Category: Carports › Freestanding and Lean-To Carports › Purlin Sections and Fittings

By Huu Khanh Nguyen · Updated November 5, 2026

Parameters

Name	Default	Unit
Length	6000	mm
Width	row[1]	mm
Height	profile == 'Eaves' && slope > 0 ? depth - thickness / 2 + ((row[1] - thickness / 2 - 0.5 - 0.68 * row[2] * Math.sin((slope * Math.PI / 180))) - thickness / 2) * Math.tan((slope * Math.PI / 180)) + (thickness / 2) * (Math.cos((slope * Math.PI / 180)) + Math.sin((slope * Math.PI / 180))) : depth	mm
Depth	200	mm
Base metal thickness	2	mm
Profile	Sigma
Top flange angle	0	°