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Description Celotex CW4000 Cavity Wall PIR Insulation Board offers an eco-conscious solution for improving thermal efficiency in buildings. Crafted from polyisocyanurate (PIR), a sustainable insulation material, it enhances energy performance while reducing environmental impact. Designed for easy installation, this board boasts exceptional thermal properties and incorporates a low emissivity foil facing. Available in thicknesses ranging from 40mm to 100mm, it's ideal for partial fill cavity wall applications, providing both efficiency and sustainability. Key Features: Excellent thermal performance with a thermal conductivity of 0.022 W/m.K, reducing the thickness of insulation required to hit the target U-value Low emissivity foil facing provides improved thermal performance in sealed cavity air spaces, improving the achievable U-value. The boards are light and rigid assisting with ease of transportation, handling and fitting. They are sized to fit standard wall tie spacing for ease of installation.