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The Kingspan Kooltherm K106 cavity board is a premium performance insulation solution designed specifically for full-fill masonry cavity walls. With its rigid phenolic core, foil and fleece facings, this board delivers excellent thermal performance — thermal conductivity typically around 0.019 W/m·K. More info
K106 is designed for modern construction and retrofit projects where space is at a premium and high insulation performance is required. The board achieves very low U-values for cavity wall builds while maintaining a 10 mm residual cavity for moisture control. The foil-faced inner side helps reflect heat back into the building, and the outer fleece facing resists external moisture penetration while allowing vapour diffusion.
With its low λ-value of 0.019 W/m·K, Kooltherm K106 allows you to meet or exceed required U-values for cavity walls with thinner insulation than many typical boards. The 10 mm residual cavity ensures moisture control behind an unventilated wall build, and the board’s rigidity resists sagging or compression over time — helping maintain thermal performance throughout the life of the building.
For a standard 100 mm masonry cavity wall, the 90 mm or 115 mm thickness of K106 will often meet required U-values thanks to its ultra-low λ-value of 0.019 W/m·K. Always run a U-value calculation including self-build or retrofit details.
Yes — Kooltherm K106 is ideal where space is limited while still delivering high performance. Ensure the cavity is fully filled and the residual air gap maintained.
Each board covers 0.54 m². To cover 1 m², you’ll need approximately 1.85 boards. Round up and include extra for cutting and waste around openings.
The board has a foil-facing on the warm side and a vapour-open fleece on the outer side. In normal cavity wall builds, an additional vapour control layer is not required.
K106 is classified as Euroclass F (Reaction to fire) under EN 13501-1. Wall build-ups must satisfy the relevant fire regulations.
Due to its low thermal conductivity (0.019 W/m·K), K106 achieves required U-values with thinner insulation compared with mineral wool or EPS, helping retain internal space.
Yes — the phenolic core has low thermal ageing and supports high-performance builds. Consider overall embodied carbon and façade build-up in sustainability plans.
| Specification | Value / Range |
|---|---|
| Board Dimensions | 1200 mm × 450 mm |
| Thickness Options | 90 mm, 115 mm |
| Thermal Conductivity (λ) | 0.019 W/m·K typical |
| Compressive Strength | ≥100 kPa at 10% compression |
| Residual Cavity | 10 mm |
| Facing | Foil (inner) + vapour-open fleece (outer) |
| Fire Performance (reaction to fire) | Euroclass F (EN 13501-1) |
| Application Area | Full-fill cavity wall insulation up to 25 m height |
Using Proctor Wraptite with Kingspan K106 90 mm cavity wall insulation creates a high-performance, airtight, and energy-efficient wall system. Wraptite’s self-adhered vapour-permeable membrane prevents air leakage while allowing moisture vapour to escape — protecting the insulation and structure from condensation. When combined with the exceptional thermal efficiency of K106, this pairing helps achieve low U-values and meet modern building regulations with ease. The result is a durable, comfortable, and energy-smart building envelope that performs consistently across all seasons.
