Our customers are using Boxspan beams to replace timber in many structural applications, such as sub-floors, decks, and roof frames, without the worry of termites.

Boxspan beams offer superior strength and stability, making them a great choice for any project.

The Boxspan beam has two "C" shaped sections made out of high tensile zinc coated steel which give it an appearance much like traditional timber framing members

The long spanning beam produced by high-tensile steel and hollow section is perfect for projects that need to resist sagging or twisting with time.

This sleek, revolutionary system coats the inside and outside of your beam in a protective zinc alloy to keep it looking good for years.

Boxspan has an extensive range of sizes to suit every project. With dimensions ranging from 100 x 50mm - 250 x 50 mm, you are guaranteed not only quality but also economy in your choice!

With a vast range of brackets and accessories, Boxspan makes it easy to use.

The controlled tolerances for the beams up 12.5m in length ensures that you will get what's required every time!


If you're building a new home, you'll want to consider using Spantek Boxspan beams. They come in a range of sizes and gauges, so you can find the perfect one for your project.

Boxspan beams come in a range of sizes and gauges from 100 x 50 mm to 250 x 50 mm with base metal thickness (BMT) from 0.6mm to 1.0mm. This ensures that an economical Boxspan beam can be obtained for each individual project.


Want a very straight floor?

With a Boxspan floor frame system, you'll get one of the most cost-effective and versatile ways to elevate your subfloor.

The Boxspan floors are an economic and efficient alternative to a slab on ground.

The gauge is indicated by the suffix, i.e. B100-12. This refers to the total metal thickness at the top and bottom flanges (2 x BMT x 10). Therefore two layers of 0.6mm metal = 1.2mm represented as “-12”.

Beam sizes include:

  • 100 x 50 beams (gauges available are B100-12 & B100-16)
  • 150 x 50 beams (gauges available are B150-16 & B150-20)
  • 200 x 50 beams (gauges available are B200-16 & B200-20)
  • 250 x 50 beams (gauges available are B250-20)

Click to see Boxspan flooring product features and specifications

Not only does it work well in low-set or granny flat situations but can also support higher kits such as pole houses, and can be used for ground floor, raised floors, upper floors, mezzanine floors and commercial floors.


If you're in the market for a new roofing system, take a look at Spantek Boxspan products.

When it comes to spanning large gaps, Boxspan is the best choice for roof framing.

With less depth required for installation than timber, the Boxspan rafters can achieve equivalent spans and is an extremely efficient way to frame roofs and can be used for both steel and timber framed homes.

The lightweight design makes it ideal for long spans, cathedral ceilings, and roomy lofts. It's also been proven to work well in commercial projects like schools.

Click to see Boxspan roofing product features and specifications


With their range of brackets, Spantec allow for a very large number of floor and roof configurations to be assembled.

Boxspan brackets are made from zinc coated G2 grade steel, which complies with AS1397/G2 Z450 and AS/NZS 1365:1996.

They come in a range of thicknesses, so you can find the perfect fit for your needs. And because they're so versatile, they can be used for a wide variety of floor and roof configurations.

The arrangement of these supports can be found on Boxspan Residential Span Tables under ‘Connection & Installation Details’ for your convenience with a range that suit different depths as well as many angles available too!

Boxspan Beam Brackets

Brackets include:

  • Framing bracket
  • Internal End Cap
  • Top Hap
  • Mitre Framing
  • Internal Bay
  • Framing Bracket Double
  • Deck Corner
  • Internal Deck Corner


Our residential span tables provide detailed product, design and typical installation information that can be used for the design of sub-floors, second storey floors, and a number of roof types and beams including lintels.

Download the Boxspan-Residential-Span-Tables



Spantec Boxspan beams are a cost-effective alternative to timber beams. It's made of lightweight and durable steel, making it a more economical solution for larger spans.

It is also easier to install than timber, and does not require the use of tools or specialist equipment.

Spantec Boxspan beams also offer a competitive cost option over timber as they require minimal maintenance, are galvanized inside and out, and are rolled to exact lengths.

This results in minimal waste being produced, making Spantec beams a more cost-effective and environmentally-friendly option.


If you are looking for a supplier of Spantec Boxspan products, we have three conveniently located distribution centres throughout NSW, including: