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Robertson offer a range of purlins and girts Z and C profiles, cut to length, un-punched or punched. All purlins and girts are manufactured from high tensile Galvanized steel.


Purlins can be used as structural steel in light weight buildings, but must be used in accordance with a design certified by an engineer. Selection of the correct coating weight is critical when specifying purlins. Z350 coating is suited to many applications as long as it is not a highly corrosive environment. For high corrosive environments specify Z450 and consider other corrosion protection measures, such as powder coating.


C Section Purlins
C Section purlins are generally roll formed steel. Robertson C Section purlins are recommended for simple, non-continuous span construction. Structural applications include portal frames, roofing, single bay buildings, wall cladding and flooring systems. These can also be used on multi bay buildings in lines of simple spanning purlins and girts.

Z Section Purlins
Z Section purlins are generally roll formed steel. Robertson Z Section purlins have one broad and one narrow flange. These are designed to fit neatly and are used for lapping at the internal supports producing structurally continuous lines of purlins for the length of the building.

Z profile sections allow for lapping

  • Improved load capacity and rigidity with lapped Z sections
  • Option to lap Z Sections in various combinations.
  • Available in a range of steel grades
  • Spans further
  • Factory hole-punch options available