Mike Vaczi, technical director for Celotex Insulation, explains the features and benefits of the manufacturer’s XPS insulation
Q. What is Celotex XPS Insulation, and What Are the Benefits of Using It?
Following our acquisition by SOPREMA, we are excited to introduce Celotex XPS (extruded polystyrene), a rigid foam insulation board designed to provide thermal insulation and compressive strength suitable for specialist high-load-bearing applications.
XPS is particularly valued for its compressive strength, making it suitable for a diverse range of applications. The product is available in three different compressive strengths: 300 kPa, 500 kPa, and 700 kPa. This allows for flexibility in specifying the correct insulation for use in suspended concrete ground floors, above or below the damp-proof membrane (DPM) in ground-bearing concrete floors, in new and existing domestic and non-domestic buildings.
In addition to its compressive strength, Celotex XPS offers thermal efficiency with lambda values as low as 0.032 W/(m·K). It can help to enhance energy efficiency and ensure that buildings meet the latest Building Regulations.
The boards are lightweight, which helps to reduce transport energy consumption. They are easy to move around on-site, supporting efficient installation and reducing the risk of injuries from heavy lifting. They can also be cut using a hot wire, saw, or cutter, allowing for precise trimming.
Another key advantage is a closed-cell structure, which exhibits minimal moisture absorption. When the product is used on a ground-bearing floor or a suspended concrete floor, an AVCL (air and vapour control layer) should be installed on the warm side of the insulation to inhibit the risk of interstitial condensation, unless a risk assessment shows this is not necessary.
Q. What applications is Celotex XPS suitable for?
Celotex XPS insulation is suitable for various construction applications, particularly suspended concrete ground floors and above the damp-proof membrane in ground-bearing concrete floors.
For below-ground applications – such as foundations and basements – its moisture-resistant properties make it the ideal solution. It is widely used in flooring applications, where its compressive strength ensures suitability for heavy load-bearing scenarios.
Q. What are the key considerations for installing Celotex XPS?
Proper installation of Celotex XPS insulation is essential to maximise its performance. Before installation, ensure the surface is level and clean. Additionally, consider moisture protection, and install an air and vapour control layer where required to prevent condensation-related issues.
Selecting the correct XPS grade is crucial, as different applications require varying levels of compressive strength. To maintain the sustainability benefits, dispose of any offcuts responsibly to support full recyclability.
Installation guides are available, providing recommended practices for different applications.
Q. What role does Celotex XPS play in floor insulation?
Floor insulation is an essential component in modern construction, providing energy efficiency and improved thermal comfort. Celotex XPS insulation is particularly effective in a variety of flooring applications. For concrete floors, the product’s compressive strength make it an excellent choice for environments where durability and load resistance are critical.
In high-load areas such as factories and warehouses, the material provides the necessary structural stability to support vehicular traffic. Additionally, when used in underfloor heating systems, it enhances heat retention and ensures even heat distribution, maximising energy efficiency.
Q. How does Celotex XPS compare with other insulation materials?
Compared to other insulation options, Celotex XPS offers superior moisture resistance, making it a more reliable choice in environments exposed to damp conditions. It also provides greater compressive strength than EPS and PIR, making it the preferred option for load-bearing applications. Additionally, this solution retains its insulation properties for decades, unlike some natural fibre insulations that may degrade over time.
Q. How does Celotex XPS contribute to energy efficiency?
Energy efficiency in buildings has become increasingly important due to rising energy costs and stricter regulatory requirements. Celotex XPS insulation plays a crucial role in improving energy performance by minimising heat loss through floors. This insulation material helps buildings achieve lower energy consumption by providing excellent U-values, enhancing overall thermal performance.
By ensuring U-value calculations align with BS 5250:2021 recommendations, Celotex XPS supports compliance with industry standards such as Building Regulations Part L and the Future Homes Standard. Its long-term durability helps maintain energy efficiency throughout a building’s lifespan. Choosing this insulation for your construction projects can reduce heating and cooling demands, leading to lower carbon emissions and cost savings.
Q. What technical support do you offer?
We provide comprehensive support from the design stage to installation. Our technical support team offers expert guidance on insulation specifications and best practices. Additionally, Celotex provides an online U-value calculator to assist in determining accurate insulation performance for various applications.
For further details, extensive product documentation and technical guides are available. If specific project requirements need to be addressed, the technical team can provide tailored recommendations and support to ensure the best insulation solutions are implemented.
For further information on Celotex XPS visit Celotex XPS 700 SL FS | SOPREMA UK
