NBS Source
Sigma Purlins


The Sigma purlin is used for both roof and wall applications and is a supplement to the existing Z purlin. Purlins are installed with a combination of cleats and sleeves where required in the design, to provide overall strength.

Manufactured in accordance with BS EN 10326. Base steel is galvanized according to the Sendzimir principle with a zinc coating of 275 g/m², divided on both sides of the steel.

General information

Uniclass 2015

Pr_20_76_51_21 Cold-formed galvanized steel sectionsPrimary


G12/330 Proprietary metal members

Specification data - Cold-formed galvanized steel sections

Product Reference

Sigma Purlins


140 –

Height: 140 mm.

170 –

Height: 170 mm.

200 –

Height: 200 mm.

230 –

Height: 230 mm.

As drawing

As schedule


1.5 mm

2 mm

2.5 mm

As drawing

As schedule

Standard product features


53 mm.

Product Options

Load tables:

Consult manufacturer's literature for further information.

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Z Purlins

Z Purlins