Unilin Full Fill PIR Cavity Wall Insulation – 1200 x 450 x 100mm

The Unilin Full Fill PIR Cavity Wall Insulation Board (1200 x 450 x 100mm) is a high-performance rigid insulation solution designed for new build cavity walls. Built with a polyisocyanurate (PIR) core and low-emissivity foil facings, it delivers excellent thermal efficiency, helping achieve low U-values and compliance with Part L Building Regulations. Its tongue & groove edge detail ensures a secure, tight fit that reduces thermal bridging and air leakage.

Specifications

• Brand: Unilin
• Product Type: Full Fill PIR cavity wall insulation board
• Dimensions: 1200mm x 450mm x 100mm
• Material: Rigid PIR (polyisocyanurate) with foil facings
• Application: Full-fill cavity wall insulation (new build)
• Edge Detail: Tongue & groove joints for airtight fit

Features & Benefits

• Excellent thermal resistance for improved U-values.
• Tongue & groove edges reduce heat loss and cold bridging.
• Lightweight rigid boards – easy to cut and install.
• Foil facings enhance energy efficiency.
• Moisture-resistant PIR core ensures long-term performance.

Applications

• Full-fill insulation for new build cavity walls
• Residential housing developments
• Commercial and energy-efficient building projects

Is this board suitable for retrofit cavity walls?
No. Unilin Full Fill PIR boards are designed for new build cavity wall applications. Retrofit projects usually require injected bead or foam insulation systems.