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When you’re building or upgrading a property, insulation is one of the most important long-term investments you can make. The right insulation doesn’t just save energy — it boosts comfort, helps achieve compliance with building regulations, and reduces carbon emissions. Among today’s premium products, Kingspan Kooltherm K106 cavity boards stand out for their exceptional thermal performance and space-saving design.
At Cut Price Insulation, we proudly supply K106 cavity boards in popular sizes such as K106 90 mm and K106 115 mm, available with next-day delivery and free delivery on orders over £500 + VAT — helping you complete your project faster and more cost-effectively.
The Kingspan K106 cavity board insulation is engineered for maximum performance in minimal thickness. With a thermal conductivity as low as 0.019 W/mK, it provides outstanding insulation for partial-fill cavity wall systems while maintaining a 10 mm residual cavity.
This slimline design means less wall build-up and more usable space inside the building — a major advantage for modern housing and commercial projects where every millimetre matters. Whether you choose the K106 90 mm cavity insulation board or the K106 115 mm cavity insulation board, you’ll achieve excellent U-values that meet or exceed current Building Regulations.
What makes Kingspan Kooltherm K106 so effective is its fibre-free thermoset phenolic core. Unlike traditional PIR or mineral wool boards, this advanced material maintains consistent thermal performance throughout the lifespan of the building.
The phenolic structure resists moisture absorption, sagging, and degradation, ensuring your walls stay insulated and effective year after year. This makes the K106 90 mm and 115 mm boards ideal for both new-builds and refurbishments where quality and longevity are essential.
Each K106 cavity board is designed with dual-sided protection. The outer face features a water-tight, vapour-open polypropylene fleece that stops rain penetration, while the inner face uses a low-emissivity foil to reflect heat back into the interior space.
Together, these layers provide excellent moisture resistance, reducing the risk of damp or condensation, while the board’s rigid structure ensures it remains unaffected by air infiltration. For properties in exposed or high-humidity areas, this reliability is a crucial advantage.
Builders and installers love Kingspan K106 cavity insulation boards for their ease of handling. Lightweight yet strong, they’re simple to cut and can be fitted using standard cavity wall ties and retaining discs. The rigid format ensures a neat, continuous layer of insulation that won’t slump or warp during installation.
The K106 115 mm board is especially suited for deeper cavities and higher performance targets, while the K106 90 mm option provides an excellent balance between insulation efficiency and wall thickness.
At Cut Price Insulation, we make sourcing high-performance insulation easier than ever. We offer next-day delivery across most of the UK on all Kingspan Kooltherm K106 cavity boards, so you can keep your project moving without delays. Plus, when you spend £500 + VAT or more, you’ll receive free delivery — helping you stay on budget while getting top-quality materials delivered straight to your site.
Whether you need K106 90 mm, K106 115 mm, or other thicknesses, our experienced team is ready to help you choose the right specification for your project.
Choosing Kingspan Kooltherm K106 cavity board insulation means choosing efficiency, durability, and reliability. Its phenolic core, low thermal conductivity, and moisture-resistant design make it one of the best cavity wall insulation boards for new builds and retrofits alike.
If you’re ready to boost your building’s performance while saving time and money, order your K106 cavity boards today from Cut Price Insulation — and enjoy next-day delivery plus free shipping on orders over £500 + VAT.
