Building Fully Compliant Class A1 Substructures: Techniques, Rules & Wallbarn’s System

With increasing demands on high-rise buildings, podium decks, and public realm spaces, substructures must perform to the highest standards. Wallbarn’s Class A1 rail substructure system provides a fully non-combustible framework that combines fire compliance with strength, adaptability, and ease of installation.

Fire Safety at the Core

The Class A1 rail system is Class A1 rated under EN 13501-1:2018 and fully compliant with BS 8579. This means it is suitable for use in the most sensitive and highly regulated environments, including high-rise residential towers, commercial buildings, and public access areas.

By using only metal components and excluding all plastic and rubber parts, the system removes any risk of ignition. This ensures compliance with UK fire safety regulations and provides peace of mind for architects, contractors, and building owners.

Strength and Stability

Every element of the system is designed for load-bearing strength and durability. When paired with MetalPad EX pedestals, the structure can support significant weights, making it suitable for porcelain, concrete, or natural stone paving.

The robust aluminium rails provide excellent lateral stability, reducing the chance of movement across large paved areas. This guarantees long-term performance even under heavy foot traffic.

Ease of Installation

Despite its strength, the Class A1 rail system has been engineered for fast and straightforward installation. Pedestals, rails, and connectors are all supplied with precision fittings, ensuring consistent results on site.

Because it is modular, the system can adapt to a wide range of build-ups and surface conditions. Contractors can install it efficiently on uneven decks, ensuring level finishes with minimal disruption.

For more versatile layouts, it works seamlessly with other Wallbarn solutions such as the I-Plus aluminium rail and fire rated paving system.

Applications Across Modern Construction

The Class A1 substructure system is highly adaptable, making it suitable for:

• Roof terraces in high-rise developments

• Podium decks in urban regeneration projects

• Balconies requiring fully fire-rated build-ups

• Public realm areas where compliance and strength are essential

For projects that integrate greenery alongside paving, the system also connects easily with the Permeate planter system, helping designers create multifunctional spaces.

Benefits at a Glance

• Class A1 rated under EN 13501-1:2018

• Fully compliant with BS 8579

• 100% metal – no plastic or rubber components

• High load-bearing capacity with MetalPad EX

• Strong aluminium rails provide lateral stability

• Quick, easy installation with precision fittings

• Compatible with paving, decking, and planter systems

Meeting Industry Standards

Fire safety is now a key priority in construction, particularly for residential and mixed-use developments. The Class A1 rail substructure system ensures full compliance with the latest regulations while still offering design flexibility.

By combining with Wallbarn’s wider fire rated systems, contractors can deliver fully compliant outdoor environments without compromising on aesthetics.

Durability in Every Build

Because the system is made entirely from aluminium and galvanised steel, it is resistant to corrosion, warping, and degradation. This long-term durability reduces the need for replacements or remedial works, ensuring value for developers and reliability for end users.

Conclusion

For projects where safety and compliance cannot be compromised, the Class A1 rail substructure system sets the benchmark. Combining fire safety, strength, and installation efficiency, it provides contractors with the confidence to deliver projects that are fully compliant with UK standards.

When integrated with fire rated paving, I-Plus aluminium rails, and Permeate, the result is a complete, future-proof solution for safe and stylish outdoor spaces.