Wetherill Park
Central Coast

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LYSAGHT FIRMLOK® Light Structural Beam


LYSAGHT FIRMLOK® Light Structural Beam
Modern, steel beam in attractive colours

LYSAGHT FIRMLOK® structural beams consist of two interlocking C-sections. They are available in three sizes F10011, F15015 and F20020 depending on your application and aesthetic preference.

  • Light, strong and universal in their application
  • A range of connection types and accessories allows you to erect your project with ease
  • Uniform in quality, doesn't warp or split, it doesn't need painting
  • Consistent straightness simplifies alignment

Common Uses of this product

Purlin and rafter applications in verandahs, extensions, carports and awnings. Economical floor solutions when used as joists and bearers.


Stock lengths may vary contact us for available lengths.

Alternatively, LYSAGHT FIRMLOK® may be ordered to length (maximum length 12000mm). Extended lead times may apply.

Material Specifications

LYSAGHT FIRMLOK® beams are made from Next generation ZINCALUME® aluminium / zinc / magnesium alloy coated steel complies with AS1397-2011 G550, AM125 (550 MPa minimum yield stress, 125 g/m2 minimum coating mass).

The base metal thicknesses are 0.55, 0.75 and 1.00mm.

The COLORBOND® prepainted steel complies with AS/NZS 2728:2007.


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