DuoSpan

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About DuoSpan

Millboard DuoSpan® combines the strength of aluminium with the design flexibility of recycled plastic. This achieves a lightweight system that provides exceptional ease of installation, enormous strength and durability, and the scope to construct stunning decks and structures that would be impossible with conventional subframes.

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Designed to do more

DuoSpan® provides the perfect subframe for Millboard decking, as well as a universal support system for other outdoor flooring. Its ingenious design facilitates top-down fixing of Millboard Composite decking boards and makes it an easy installation for all levels of competence, no matter the complexity of the decking project.

DuoSpan® has been designed by industry professionals to comply with Eurocode 1: Actions on Structures (BS EN 1991-1-1), and is available in component form.

With other solutions the profiles aren’t always rigid and straight, leading to numerous noggins being required to help in the installation, whereas with DuoSpan the aluminium joists and beams are almost perfectly straight, resulting in a faster install.

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The Benefits of DuoSpan Decking Subframes

Flexible connectivity

Multiple brackets for all types of joints, including Flexible Brackets for non-standard angles and curves.

Slot-and-screw assembly

Screw-locating grooves and self-drilling screws ensure accurate alignment and a fast fix that’s right every time.

Unique curved constructions

The combination of rigid DuoSpan® aluminium joists with flexible Plas-Pro enables the construction of stunning, yet durable curved designs.

Exceptional spans

The DuoSpan® 99mm Joist provides an exceptional 1800mm span in residential applications, reducing the number of posts or joist supports required.

Rot and corrosion-resistant

Galvanic corrosion between different metals is minimised with our cathodic barrier fixings. Aluminium is naturally resistant to moisture, rotting and hosting algae.

Simple, stable fixing

Millboard decking can be easily and securely screwed directly into the DuoSpan® subframe at almost any angle using Durafix 45mm screws.