Bird Proof Purlins

Our boxed Bird Proof Purlins can be incorporated into C-Purlin portal, structural steel and timber pole shed designs with ease. They are lightweight, dimensionally accurate and straight. They fit into shed structures utilizing the same joist hangers designed for use with SG8 and SG10 timber. They can be used in herringbone sheds, wintering sheds, dry feed pads, critical storage facilities, implement sheds and canopies where bird proofing is a necessity.

There are three key reasons these purlins are bird proof:

  • The enclosed box section means there are no lips or channels for the bird to perch on.
  • By mounting the boxed purlin between portals, rather than on top like other purlin products, we greatly reduce the nesting points available to birds.
  • The product is symmetrical, which reduces rolling of the section under load, therefore allowing us to remove the girts and bracing required by other products. The traditional strap bracing can just be fitted above the purlins.


  • No waste - the Bird Proof Purlins arrive onsite cut-to-length ready to be installed.
  • Increased span - when compared to similar sized profiles of steel, timber, and laminated timber products. With our boxed sections we can span up to 9 metres in extra high wind and snow load.
  • Easy install - simply mount the joist hangers to the portal during assembly on the ground, then carry your pack of Bird Proof Purlins up with you on the cherry picker or scissor platform. They can then drop straight into the hangers at each end ready for you to connect using Tek screws. No cumbersome bracing or nuts and bolts to deal with.
  • No need to flash the lower flange or between top mounted purlins - therefore reducing labour and material costs onsite. See our connection detail PDFs below to see how easily these attach to the building.
  • The Bird Proof Purlins are lightweight.


Bird Proof Purlins are manufactured with high tensile Z275 galvanised coated steel (or Z450 galvanised coated steel upon request) which provides ample pull-out strength for all applications - so you know they will stand the test of time in New Zealand conditions.

Span Calculations

Specify Bird Proof Purlins in your next project. We can help with span calculations, and profile and spacing capability.

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