How Thick Should Celotex Insulation Be? (2024)

Choosing the right thickness of Celotex insulation is essential for creating an energy-efficient and comfortable home. Insulation thickness significantly determines how well your home retains heat, reduces energy consumption, and meets UK building regulations. 

Whether you're insulating walls, floors, roofs, or loft spaces, the appropriate thickness will depend on several factors, including the specific area being insulated, its required U-value, and any physical limitations of the space. With energy efficiency targets becoming increasingly important in 2024, understanding these requirements is key to achieving cost savings on heating and ensuring compliance with updated building standards.

In this guide, we'll explore the factors determining how thick Celotex insulation should be and provide practical recommendations to help you make an informed choice. With the right guidance, you can ensure your insulation meets building regulations and contributes to a more energy-efficient and sustainable home.

Are you ready to insulate with Celotex and ensure you choose the right thickness? Look no further—GreenMatch is here to assist you. We can connect you with top insulation specialists in your area, making the process easy and hassle-free. By filling out our quick 30-second form, you’ll receive up to four free quotes from trusted professionals. There are no hidden costs and no obligations. Click below to learn more.

Celotex is a type of rigid foam board insulation material designed to deliver excellent thermal performance while being lightweight and durable. It consists of three layers, with a polyisocyanurate (PIR) foam core between two outer layers of low-emission foil. This structure makes Celotex an efficient and versatile material for insulating various building parts.

One of Celotex's key advantages is its impressive thermal efficiency, which helps maintain comfortable indoor temperatures by keeping spaces warm in winter and cool in summer. This leads to reduced energy consumption and lower heating and cooling costs. In the comparison of Hybris vs Celotex, Hybris offers decent thermal performance but typically requires more thickness to achieve similar results, making Celotex a more space-efficient choice. 

Additionally, Celotex is water-resistant, making it suitable for areas where moisture could be an issue such as insulation for your loft. The hard-wearing nature of Celotex further ensures long-lasting performance in a variety of environments, reinforcing its superiority as an insulation material.

Celotex stands out for its sustainability. Around 50% of its composition is made from recycled materials according to Building Materials, which helps lower its carbon footprint during production. The insulation is also recyclable, reducing waste that would otherwise go to landfills. Additionally, its manufacturing process uses low-VOC (volatile organic compound) blowing agents, which minimizes its environmental impact over its lifetime.

In terms of cost, Celotex offers options for a range of budgets, with prices varying from £13.50 to £83.00 depending on the thickness and manufacturer. Its lightweight design makes it easy to handle and install, making it suitable for walls, roofs, and floors. Overall, Celotex combines efficiency, durability, and environmental responsibility, making it a strong choice for residential and commercial insulation needs.

The required thickness of Celotex insulation depends on the specific area of your home and the maximum U-value allowed for that space. The U-value of insulation measures how well a material allows heat to pass through it; the lower the U-value, the better the material is at insulating and retaining heat. Every insulation material, including Celotex, also has an R-value, reflecting its heat flow resistance. A higher R-value means better insulation, helping to achieve a lower U-value.

For Celotex, the R-value typically ranges between 2.25 and 4.5 per inch, depending on the specific product. While 100mm is a common thickness for Celotex insulation, the exact requirement varies based on the insulated area. Below are the recommended U-values for different areas of a home:

To meet these U-values, the following Celotex thicknesses are recommended:

Working with a professional is essential to ensure you select the correct thickness of Celotex insulation for your needs. Comparing multiple quotes can help you find an installer that fits both your requirements and budget, but this process can often be time-consuming and yield limited results. 

Fortunately, GreenMatch makes it easier. By completing our quick 30-second form, you’ll receive up to four free, no-obligation quotes with no hidden costs. Click below to get started and learn more!

Choosing the correct thickness for Celotex insulation ensures your home is energy-efficient and complies with building regulations. To make the right decision, follow these steps:

Are you ready to get started? Save time and effort by letting us assist you. At GreenMatch, we can provide up to four free quotes from trusted professionals—no hidden costs or obligations. Just fill out our quick 30-second form. Click below to learn more.