Strength, Safety, and Simplicity: The Benefits of Wallbarn’s I‑Plus Beam Substructure System

When constructing elevated outdoor areas—such as roof terraces, balconies, podium decks or landscaped platforms—the long-term performance of the finished surface depends on the strength and quality of the underlying framework. Wallbarn’s I‑Plus Beam aluminium substructure system offers a lightweight yet exceptionally robust solution designed to meet the demands of modern construction. Combining strength, non-combustibility, and ease of installation, this modular system provides the ideal platform for both paving and decking applications.

Built for Performance

The I‑Plus Beam is manufactured from high-grade EN-6063 T6 extruded aluminium. Unlike timber, this material is dimensionally stable, corrosion-resistant, and unaffected by moisture or temperature changes. This makes it suitable for use in a wide range of environments, including exposed rooftops, coastal locations, and urban areas where long-term durability is essential.

Its rigidity and strength allow for long spans between pedestals, reducing the overall number of supports needed and offering greater design flexibility. The aluminium sections are available in different depths to accommodate a variety of build-up heights and load requirements.

Class A Fire-Rated for Compliance and Safety

In a building climate where fire safety is paramount, particularly in high-rise and public spaces, the I‑Plus Beam system plays a vital role. The aluminium profile itself is non-combustible, and when combined with Wallbarn’s Class A-rated pedestals and accessories, the entire substructure assembly meets the highest fire safety standards currently required under British and European regulations.

This makes the system suitable for residential balconies, roof terraces and communal areas in buildings over 11 metres in height, where Class A materials are often mandatory.

Versatile and Adaptable

One of the standout features of the I‑Plus Beam system is its adaptability. It is suitable for use with both paving systems—such as porcelain tiles, stone, and cement fibre slabs—as well as a wide range of decking solutions, including timber, composite and aluminium boards.

The beams are compatible with a full suite of accessories that allow for easy integration with joists, paving supports, connectors and brackets. This dual-use functionality streamlines product selection and simplifies installation, particularly on mixed-material projects.

Modular, Tool-Free Installation

The I‑Plus Beam is designed to integrate seamlessly with Wallbarn’s adjustable pedestal systems using a click-and-lock connection method. In most cases, no tools or mechanical fixings are required to join components together. Beams can be slotted into place using dedicated headpieces and secured with wing nuts, enabling installers to make height and alignment adjustments on-site without slowing down the build.

This system is ideal for fast-paced construction environments and helps to reduce errors, labour time, and material waste.

Strong and Lightweight

Despite its high strength, aluminium is extremely lightweight, making it easier to transport, handle and position during installation. This is particularly useful in settings with limited access or where health and safety considerations make heavier components impractical.

Its light weight does not compromise its strength. The I‑Plus Beam is capable of spanning up to 2,200 mm depending on the profile depth and support conditions, allowing for fewer pedestal points and therefore quicker installation times.

Drainage and Substrate Protection

When used in conjunction with freestanding pedestals, the I‑Plus Beam helps raise the surface above the substrate, creating a ventilation void that allows water to drain freely and air to circulate. This design protects waterproofing membranes from damage and supports the longevity of the deck or paving installation.

The system is non-invasive, meaning there is no need to drill into the roof or terrace surface, which is particularly important when preserving insulation or damp-proofing integrity.

Environmentally Considerate and Low Maintenance

Aluminium is not only durable—it is also 100% recyclable, contributing to more sustainable construction practices. It requires very little maintenance over its lifespan and does not warp, split, rot or degrade in the same way as timber or composite alternatives.

This low-maintenance profile makes it ideal for long-term installations, particularly in commercial and public settings where upkeep and performance are crucial.

Summary of Key Benefits

Final Thoughts

Wallbarn’s I‑Plus Beam Substructure System is an intelligent and future-ready choice for anyone seeking a durable, compliant and highly adaptable base for decking or paving projects. Its combination of strength, light weight, fire safety and ease of use makes it ideal for a wide range of commercial and residential applications.

Whether you’re working on a high-rise balcony, an urban roof terrace, or a large podium deck, the I‑Plus Beam provides the reliability and performance needed to support safe, attractive, and long-lasting outdoor spaces.