Unilin XT CW Cavity Wall PIR Insulation 1200 x 450 x 50mm

The Unilin XT CW PIR Cavity Wall Insulation Board is a high-performance, rigid insulation solution designed for partial-fill masonry cavity walls. With a PIR (polyisocyanurate) core and low emissivity foil facings, it provides excellent thermal efficiency while maintaining a slim wall profile, making it perfect for energy-conscious residential and commercial projects.

Lightweight and easy to handle, the board features tongue & groove edges for secure, continuous joints, ensuring minimal heat loss and long-term durability.

Features and Specifications

• Brand: Unilin
• Product Type: XT CW PIR Cavity Wall Insulation
• Dimensions: 1200mm (L) x 450mm (W) x 50mm (T)
• Material: PIR (polyisocyanurate) core with low emissivity foil facing
• Thermal Conductivity: 0.022 W/mK
• Edge Type: Tongue & Groove for tight joints and reduced thermal bridging
• Fire Rating: Euroclass E
• Application: Partial-fill cavity wall insulation

Benefits

• High thermal performance – reduces heat loss and helps achieve low U-values.
• Lightweight and easy to install – simplifies on-site handling and fitting.
• Durable and moisture-resistant – retains insulation properties over time.
• Tongue & groove edges – ensure secure joints and consistent coverage.
• Compliant with building regulations – meets modern UK standards for cavity wall insulation.

Ideal Applications

• Partial-fill masonry cavity walls
• Residential and commercial construction projects
• Extensions, refurbishments, and new builds

Is the 50mm XT CW board suitable for full-fill walls?
No, the 50mm Unilin XT CW board is intended for partial-fill applications, leaving a residual cavity to prevent moisture ingress.