Kingspan Kooltherm K8 Cavity Board

High-Performance Cavity Wall Insulation

Kingspan Kooltherm K8 Cavity Board provides a high-performance insulation solution for masonry cavity wall construction. The board combines a fibre-free, closed-cell thermoset phenolic insulation core with reflective composite foil facings on both sides.

The reflective foil facings help improve the thermal resistance of the cavity. Furthermore, the 25mm & 40mm profile provides increased insulation thickness and a declared R-value of R1.1 – R1.75.

Efficient Thermal Performance

Kooltherm K8 helps maintain a clear cavity while providing effective thermal insulation. As a result, it can help improve the overall thermal performance of masonry cavity wall systems.

Moreover, the rigid phenolic core delivers strong thermal performance for its thickness. The reflective foil facings also contribute to the board’s thermal performance and help improve insulation within the cavity.

Suitable for Masonry Cavity Walls

The K8 Cavity Board suits a range of residential and commercial masonry wall applications. In addition, its rigid board format provides a practical insulation solution for builders, insulation contractors and construction professionals.

Kingspan manufactures K8 in Australia, while CodeMark certification supports its use for relevant NCC compliance requirements.

Key Features

• 25mm nominal thickness R1.1 (20 sheet pack)
• 40mm nominal thickness R1.75 (12 sheet pack)
• 1200mm x 514mm board size
• Approximately 0.61m² coverage per board
• Fibre-free, rigid thermoset phenolic insulation core
• Reflective composite foil facings
• Suitable for masonry cavity wall applications
• Helps improve cavity thermal performance
• Helps maintain a clear cavity
• CodeMark-certified for relevant NCC compliance requirements
• Manufactured in Australia

Why Choose Kingspan K8?

The K8 board provides an effective insulation solution when you need greater thermal performance within a masonry cavity wall. In comparison with thinner insulation options, its increased thickness provides a declared R-values of R1.1 – R1.75.

Furthermore, the 25mm & 40mm thickness provides additional insulation depth while the rigid phenolic core maintains a compact board profile. Therefore, K8 offers a practical option for projects where the available cavity space allows a 25mm or 40mm insulation board.

Board Coverage and Dimensions

Each Kingspan K8 board measures 1200mm x 514mm and provides approximately 0.61m² of coverage. Therefore, you can use these dimensions to calculate the approximate number of boards required for your project.

Technical Information

Thickness: 25mm & 40mm
Dimensions: 1200mm x 514mm
Coverage: 0.61m² per board
Declared R-value: 25mm R1.1 – 40mm R1.75
Declared thermal conductivity: 0.023 W/m·K at 23°C for 25–40mm insulation thickness
Foil face emittance: E0.06

Always check the latest Kingspan technical documentation and installation requirements before specifying or installing the product.