The 90mm Celotex Thermaclass Cavity Wall 21 is a premium insulation solution designed for masonry full-fill cavity wall applications. Manufactured by Celotex, a leading name in the insulation industry, this rigid polyisocyanurate (PIR) board offers exceptional thermal performance and helps to achieve lower U-values without increasing wall thickness. 

Key Features and Benefits:

• High Thermal Performance: With a low thermal conductivity of 0.021 W/mK (lambda 21), Thermaclass Cavity Wall 21 delivers exceptional thermal insulation. This helps to reduce heat loss through cavity walls, contributing to lower energy bills and improved comfort in your home.  
• Tongue and Groove Edge Profile: The tongue and groove edge profile ensures a tight and secure fit between boards, minimising gaps and thermal bridging for optimal insulation performance.  
• Low-Emissivity Foil Facing: For wall constructions with a 10mm residual cavity, the low-emissivity foil facing enhances thermal performance by reflecting heat back into the room. This helps to further improve the achievable U-value.
• BBA Certified: Thermaclass Cavity Wall 21 has been rigorously tested and certified by the British Board of Agrément (BBA), ensuring its suitability and performance in full-fill cavity wall applications.  
• Lightweight and Easy to Install: The boards are lightweight and easy to handle, making them suitable for both DIY and professional installation.  
• Environmentally Friendly: Manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), contributing to a more sustainable building project. 

Applications:

• Masonry Full-Fill Cavity Walls: Ideal for insulating new build and existing cavity walls in residential and commercial buildings.   
• Extensions: Provides effective thermal insulation for new extensions, ensuring a comfortable and energy-efficient space.
• Renovations: Can be used to upgrade the insulation in existing cavity walls, improving thermal performance and reducing energy costs.   

Technical Specifications:

• Thickness: 90mm
• Board Size: 1190mm x 450mm 
• Thermal Conductivity: 0.021 W/mK 
• R-Value: 4.29 m²K/W
• Edge Profile: Tongue and Groove 
• Facing: Low-emissivity foil facings 
• Pack Quantity: 6 boards 
• Pack Coverage: 3.21m² 

90mm Celotex Thermaclass Cavity Wall 21 offers a high-performance and reliable solution for insulating your cavity walls.

Its exceptional thermal efficiency, ease of installation, and BBA certification make it a popular choice for homeowners and builders alike.