Kingspan K8 Cavity Board is a premium, high-performance insulation solution specifically engineered for partial-fill cavity wall applications in both residential and commercial constructions. Built with an advanced fiber-free rigid thermoset insulation core. It delivers exceptional thermal efficiency while maintaining a slim profile, helping you achieve strict building energy performance standards without compromising internal floor space.

Whether you are specifying for low-rise residential builds, commercial developments, or energetic retrofit projects, our range of Kingspan K8 Cavity Board products—available in both 25mm and 40mm thicknesses—offers superior thermal resistance, reliable fire performance, and long-term durability for masonry walls.

Kingspan K8 Cavity Board – Key Performance Advantages

• High Thermal Efficiency: Features a low thermal conductivity core to ensure maximum heat retention across all partial-fill cavity wall designs.

• Space-Saving Profile: Delivers superior thermal performance at a reduced board thickness compared to traditional rigid foam or mineral wool insulation materials.

• Resilient Performance: Unaffected by air infiltration and highly resistant to moisture absorption. Ensures reliable, long-term insulation efficiency over the lifespan of the building.

• Easy Handling & On-Site Fitting: Lightweight, low-density board design allows for straightforward cutting, precise edge fitting, and rapid placement during construction.

• Environmental Sustainability: Manufactured with zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), supporting sustainable building certifications.

Kingspan K8 Cavity Board – Choosing the Right Insulation Board Thickness

Selecting the proper thickness depends on your project’s target U-value, cavity width restrictions, and structural design requirements.

25mm Board Specifications

Ideal for tight cavity spaces, historical renovations, or retrofit projects. Where maintaining standard masonry cavity dimensions is critical while significantly upgrading thermal resistance.

40mm Board Specifications

Designed for new builds and modern architectural projects. Demanding enhanced thermal resistance and higher overall R-value performance across standard external brick or blockwork cavity walls.