Stone Wool Insulation

Stone Wool Insulation – ROCKWOOL Extends Trade Range With UK & Ireland’s Most Thermally Efficient

The most thermally efficient stone wool insulation..

ROCKWOOL has launched two innovative insulation solutions: Thermal Insulation Cavity Slab 32 and Thermal Frame Slab 32. These new products provide installers with the most thermally efficient stone wool insulation currently available across the UK and Ireland, setting a new benchmark for performance and reliability in the industry.

Developed using advanced patented NyRock® technology, these insulation slabs feature a highly efficient fibre structure that is denser than traditional options, effectively trapping more air within the material. This increased air retention significantly slows the transfer of heat, leading to superior thermal performance. The result is an impressively low lambda rating of 0.032 W/mK, making these slabs an excellent choice for those seeking enhanced energy efficiency and long-term insulation reliability.

Beyond their superior thermal properties, these new insulation solutions offer substantial long-term benefits. In the case of Thermal Insulation Cavity Slab 32, the thermal performance improvement is an impressive 13% over ROCKWOOL’s existing cavity slab product[1]. Importantly, these energy efficiency gains remain consistent over time, ensuring lasting benefits for homeowners and builders alike.

A key advantage of these products lies in their high-density, semi-rigid composition, which prevents slumping or sagging once installed. Independent research has shown that stone wool insulation maintains its thermal and fire resistance properties for over 55 years after installation[2]. This durability makes it an excellent long-term investment, ensuring that structures remain well-insulated and energy-efficient for decades.

ROCKWOOL Thermal Insulation Cavity Slab 32 is designed for use in masonry cavity walls in various applications, including new builds, renovations, and extensions. It holds British Board of Agrément (BBA) certification[3] for both full and partial fill applications, offering assurance of its quality and suitability for different construction scenarios.

With its industry-leading thermal conductivity value of 0.032 W/mK, this upgraded product is ideal for meeting the latest, more stringent thermal efficiency requirements outlined in Approved Document L in England. Furthermore, it offers significant space-saving benefits. To achieve a U-value of 0.18 W/m²K, builders can use just 150mm of Thermal Insulation Cavity Slab 32, depending on the specific wall build-up. This is 25mm thinner than standard stone wool insulation cavity products in a like-for-like application, allowing for more flexible and efficient design options.

A further enhancement to the ROCKWOOL Trade Range is the introduction of Thermal Frame Slab 32. This product has been specifically engineered for fitting between the studwork of external timber or light gauge steel frame walls. It is suitable for applications that feature a brick outer wall and can be installed with or without a service void, making it a versatile option for modern construction projects.

Both new insulation slabs are designed with ease of installation in mind. Their flexible nature allows them to be closely friction-fitted without requiring precise cutting, making the installation process more efficient and reducing the potential for errors. This pliability ensures a snug, secure fit that helps to minimize thermal bridging, enhancing overall insulation performance. Additionally, ROCKWOOL stone wool insulation slabs naturally knit together when installed, creating a seamless finish that further optimizes thermal efficiency.

“We understand that energy efficiency is a top priority for customers, especially in today’s climate,” said Paul Barrett, Head of Product Management at ROCKWOOL UK. “With these two new products, we have not only raised the bar on thermal performance for stone wool insulation but also ensured that this performance is practical and achievable on-site. Moreover, it is built to last for decades.”

In addition to their outstanding thermal properties, both Thermal Insulation Cavity Slab 32 and Thermal Frame Slab 32 offer natural non-combustibility and impressive acoustic benefits. The stone wool composition helps to trap sound waves and dampen vibrations, enhancing the acoustic performance of buildings. Furthermore, both products can withstand temperatures exceeding 1000°C and achieve the highest Euroclass A1 non-combustible reaction-to-fire classification, providing an additional layer of safety and reassurance for installers and property owners.

With the launch of these new products, ROCKWOOL continues to demonstrate its commitment to innovation, energy efficiency, and high-performance insulation solutions that stand the test of time.

Rockwool for Sound Insulation & Fire Protection

For more details on Thermal Insulation Cavity Slab 32 and Thermal Frame Slab 32, visit rockwool.com/uk/32

About Dylan Garton

Dylan Garton is a co-founder, video producer and editor for the Skill Builder social media platforms.

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