Celotex Thermaclass Cavity Wall 21
(3 Products)Celotex Thermaclass Cavity Wall 21 is a high-performance, full-fill PIR (polyisocyanurate) insulation board, specifically engineered for masonry cavity wall applications. It delivers superior thermal efficiency, boasting a thermal conductivity of just 0.021 W/mK, making it one of the most effective insulation solutions on the market. Designed to meet modern construction demands, Thermaclass Cavity Wall 21 helps achieve strict Part L Building Regulations compliance while maintaining a thin wall profile - critical for optimising internal space without compromising energy efficiency. The low emissivity foil facings further enhance thermal resistance, reducing heat loss and improving overall building performance.
What Is Thermaclass Cavity Wall 21?
Celotex Thermaclass Cavity Wall 21 is a high-performance insulation solution designed for full-fill cavity wall applications. Its name reflects its core attributes:
- "Thermaclass" signifies its superior thermal insulation properties.
- "Cavity Wall" indicates its intended use in cavity wall construction.
- "21" refers to its thermal conductivity rating of 0.021 W/mK, highlighting its exceptional efficiency in reducing heat loss.
Designed for versatile installation, Thermaclass Cavity Wall 21 can be fitted with either a 10mm residual cavity for easier installation and mortar squeezing or as a complete full-fill solution with no gaps.
At its core, the board features polyisocyanurate (PIR) foam, a material renowned for its outstanding thermal resistance. Flanked by low-emissivity foil facings, the board reflects radiant heat, further enhancing its insulating performance. For added performance, the engineered tongue and groove joint profile ensures a seamless fit, minimising thermal bridging and enhancing protection against wind-driven rain.
Please Note - Due to safety regulations, Thermaclass Cavity Wall 21 should not be employed in the external walls of buildings exceeding a height of 18 meters (England and Wales) or 11 meters (Scotland).
Applications
- Full fill cavity wall applications
Benefits
- Premium PIR insulation board designed specifically for full fill and partial fill cavity wall insulation applications.
- Features an enhanced thermal conductivity of 0.022 W/mK, providing superior insulation performance and reducing heat loss.
- Faced with low-emissivity composite foil, improving thermal efficiency by reflecting radiant heat.
- Slimmer profile allows for high thermal performance while maintaining optimal cavity space.
- Lightweight, rigid, and easy to install, making it suitable for new builds and energy-efficient renovations.
- Moisture-resistant closed-cell structure prevents water absorption, ensuring long-term durability and protection against damp.
- Meets UK Building Regulations for cavity wall insulation.
Thermaclass Cavity Wall 21 Thicknesses
Frequently Asked Celotex Thermaclass Cavity Wall 21 Questions
Can ThermaClass Cavity Wall 21 Be Used In All Types of Buildings?
ThermaClass Cavity Wall 21 is suitable for use in the external walls of most residential and commercial buildings. However, due to safety regulations, it should not be used in the external walls of buildings exceeding a height of 18 metres in England and Wales, or 11 metres in Scotland.
What Are The Installation Options for ThermaClass Cavity Wall 21?
ThermaClass Cavity Wall 21 offers flexible installation options. It can be installed with a 10mm residual cavity, allowing for easy installation and accommodation of mortar squeezing. Alternatively, it can be installed as a complete full-fill solution, with no residual gaps, to maximise thermal performance.
Does Thermaclass Cavity Wall 21 Contribute to Sustainability?
Yes, by improving a building’s energy efficiency, Thermaclass Cavity Wall 21 plays a role in reducing the carbon footprint of the building. Its high thermal performance ensures that less energy is required for heating or cooling, which can result in lower overall energy consumption over the life of the building.
What Are The Maintenance Requirements for Thermaclass Cavity Wall 21?
Once installed correctly, Thermaclass Cavity Wall 21 requires very little maintenance. As with any insulation, it's important to ensure that the cavity remains dry and free from moisture to maintain its insulating properties.
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