Superglass Superwall 32 Cavity Wall Slab – High-Performance Insulation

Introduction

Improving thermal efficiency is a top priority in modern UK construction, driven by rising energy costs and stricter Building Regulations. One of the most reliable solutions for insulating masonry cavity walls is the Superglass Superwall 32 Cavity Wall Slab. Designed specifically for new-build and refurbishment projects, this high-performance glass mineral wool insulation delivers excellent thermal efficiency, fire safety, and sustainability, making it a trusted choice among UK builders, architects, and specifiers .

What Is Superglass Superwall 32 Cavity Wall Slab?

Superglass Superwall 32 Cavity Wall Slab is a semi-rigid glass mineral wool batt engineered for full-fill and partial-fill masonry cavity wall applications. Manufactured in the UK, the slabs are sized at 455 mm width, allowing them to fit neatly between standard wall tie spacings with minimal cutting or waste. This design improves installation speed and ensures consistent coverage throughout the cavity .

The product is BBA-certified, confirming its suitability and long-term performance in UK construction projects, including domestic and non-domestic buildings up to specified height limits .

Thermal Performance and Energy Efficiency

Thermal efficiency is the defining feature of Superwall 32. It achieves a declared thermal conductivity (λ-value) of 0.032 W/m·K, placing it among the higher-performing mineral wool cavity wall insulations available in the UK market .

This low lambda value enables designers to meet or exceed UK Building Regulations Part L requirements for energy efficiency, helping to reduce heat loss through external walls. When installed correctly, Superglass Superwall 32 contributes to lower space-heating demand, reduced energy bills, and improved EPC ratings for residential and commercial properties.

Fire Safety and Acoustic Benefits

Fire performance is a critical consideration in UK construction, particularly following updates to building safety standards. Superglass Superwall 32 is classified as Euroclass A1 non-combustible, the highest fire reaction rating under BS EN standards. This means it does not contribute to fire growth or smoke development, providing reassurance in cavity wall applications .

In addition to thermal and fire performance, the dense glass mineral wool structure also enhances acoustic insulation, helping to reduce external noise transmission through masonry walls. This is particularly beneficial for urban housing developments, apartments, and mixed-use buildings.

Sustainability and Environmental Credentials

Sustainability plays an increasingly important role in material specification. Superglass Superwall 32 contains up to 84% recycled glass, reducing reliance on virgin raw materials and lowering environmental impact .

The product has achieved an A+ rating in the BRE Green Guide, demonstrating strong environmental performance across its lifecycle. Manufacturing is carried out under ISO 14001-certified environmental management systems, reinforcing Superglass’s commitment to responsible production and sustainable construction practices .

Applications in UK Construction

Superglass Superwall 32 Cavity Wall Slab is suitable for:

· New-build housing developments

· Low-rise and medium-rise residential buildings

· Commercial and public sector buildings

· Full-fill cavity wall constructions up to approved height limits

Its semi-rigid structure ensures the slabs remain securely in place during installation, maintaining continuous insulation and reducing the risk of thermal bridging. This reliability makes it a popular choice among UK contractors seeking consistent on-site performance .

Installation and Compliance

The slabs are designed for straightforward installation by trained professionals. Their friction-fit design helps achieve tight joints, reducing gaps that could compromise thermal performance. When installed in accordance with manufacturer guidance and BBA certification, Superglass Superwall 32 supports compliance with Approved Documents L and B of the UK Building Regulations.

Why Buy from The Yard Builders Merchant

Choosing a reputable supplier is just as important as selecting the right insulation product. The Yard Builders Merchant supplies genuine Superglass Superwall 32 Cavity Wall Slab products tailored to the needs of UK builders and trade professionals.

By sourcing insulation from The Yard Builders Merchant, customers benefit from competitive pricing, reliable product availability, and expert support when selecting insulation materials for cavity wall projects. Our focus is on supplying high-quality, regulation-compliant building materials that meet the demands of modern UK construction while supporting energy-efficient building practices.

Conclusion

The Superglass Superwall 32 Cavity Wall Slab stands out as a high-performance insulation solution for UK masonry cavity walls. With its excellent thermal conductivity, A1 fire rating, strong sustainability credentials, and BBA certification, it meets the technical, regulatory, and environmental expectations of today’s construction industry.

For builders and developers aiming to achieve long-term energy efficiency and compliance, sourcing Superglass Superwall 32 through The Yard Builders Merchant ensures quality, reliability, and expert support at every stage of your project.

The Yard Builders Merchant