Celotex CW4050 50mm x 1.2m x 0.45m - 5.94m2 Cavity wall Insulation
Celotex CW4050 50mm x 1.2m x 0.45m - 5.94m2 Cavity wall Insulation
  • Load image into Gallery viewer, Celotex CW4050 50mm x 1.2m x 0.45m - 5.94m2 Cavity wall Insulation
  • Load image into Gallery viewer, Celotex CW4050 50mm x 1.2m x 0.45m - 5.94m2 Cavity wall Insulation
The option you have currently selected is a call to enquire option. Please call us on 020-3582-6399 for more information or select an alternative option.
Regular price
£48.67 £58.40
Now Only:
£48.67 £58.40
Sold out
Unit price
£Infinity / M2 Ex.VAT

Celotex CW4050 50mm x 1.2m x 0.45m - 5.94m2

SKU: celcav50

Est Delivery between and .

Order now and get free delivery on all Celotex orders over £300 ex vat.

  • Size: 1200 x 450 mm, 50mm thickness
  • Thermal Conductivity: 0.022 W/mK, Aluminium Foil Facings
  • Eco-Friendly: Low GWP, zero ODP, CFC/HCFC-free

Click here to view full description


Introducing the Celotex CW4050 50mm x 1.2m x 0.45m - 5.94m2, a high-quality insulation solution that's making waves in the construction and energy efficiency industry. This product is designed to provide exceptional thermal insulation for partial fill cavity walls, and it comes packed with features and benefits that can greatly enhance your building project. We'll walk you through the key details, advantages, and even some potential drawbacks, all in a friendly and informative tone.

Key Features:

  • Size and Thickness: 1200 x 450 mm, 50mm thickness
  • Thermal Conductivity: 0.022 W/mK
  • Aluminium Foil Facings for enhanced insulation
  • Eco-Friendly: Low GWP, zero ODP, and CFC/HCFC-free
  • Certifications: A+ rating in the BRE Green Guide 2008, CE marking, ISO 9001:2000 compliance
  • Convenient Installation with cavity tie clips
  • Long-lasting energy savings
  • Dimensional Stability (DS) for durability


Product Specifications:

  • Area/Pack: Each pack covers an impressive 5.94m2, which means fewer boards and less time spent on installation.

  • Board Weight: These boards are lightweight, weighing in at just 2.48kg, making handling and installation easier.

  • R-Value: With an R-Value of 2.25m2K/W, this insulation offers superior thermal resistance to ensure your building stays energy-efficient.

  • Compressive Strength: The boards boast a robust compressive strength of 120kPa, making them suitable for various applications.

  • Water Vapour Resistance: Offering a water vapor resistance greater than 150MNs/g, this insulation helps maintain the integrity of your walls.


Pros and Cons


  • Efficient Thermal Insulation: The Celotex CW4050 excels at providing superior thermal insulation, ensuring your building remains energy-efficient.

  • Eco-Friendly: It's eco-friendly, with low GWP and zero ODP, making it a responsible choice for environmentally conscious builders.

  • Easy Installation: Designed for convenience, the boards fit neatly between cavity wall ties with the help of cavity tie clips.

  • Long-Lasting Savings: This product offers reliable, long-lasting energy savings, reducing your heating and cooling costs.

  • Certifications: The Celotex CW4050 comes with certifications that prove its high quality and environmental responsibility.



  • Rigidity: While the rigid structure aids in easy installation, it might not be the best fit for spaces with a lot of curves or unique angles.



    • The insulation component of this Celotex is given an A+ rating in comparison to the BRE Green Guide 2008
    • This got CE marking complying with BS EN 13165:2001
    • This is CFC/HCFC free that means zero ozone depletion potential (ODP) along with low global warming potential (GWP)
    • This is formed in accordance with BS EN ISO 9001:2000 and quality management systems by Celotex Limited

    Frequently Asked Questions

    What is the thermal conductivity (Lambda) value of the Celotex CW4050? The thermal conductivity of the Celotex CW4050 is 0.022 W/mK.

    Is this product eco-friendly? Yes, the Celotex CW4050 is eco-friendly. It is CFC/HCFC-free, has a low global warming potential (GWP), and zero ozone depletion potential (ODP).

    How do I install the Celotex CW4050 insulation boards? These boards are designed for easy installation. They can be conveniently fitted between cavity wall ties using cavity tie clips for secure placement.

    What certifications does the Celotex CW4050 insulation hold? The Celotex CW4050 holds an A+ rating in the BRE Green Guide 2008, CE marking in compliance with BS EN 13165:2001, and is manufactured according to BS EN ISO 9001:2000 quality management standards.

    What is the R-Value of the Celotex CW4050 insulation? The Celotex CW4050 insulation has an R-Value of 2.25m2K/W, which indicates its thermal resistance.

    Can this insulation help save on energy costs? Yes, the Celotex CW4050 provides long-lasting and reliable energy savings by maintaining a consistent indoor temperature, reducing the need for heating and cooling.

      Length 1200mm
      Width 450mm
      Coverage 5.94m2
      Thermal Conductivity 0.022 W/mK
      Thickness 50mm
      Weight_kg 2.48
      Brand Celotex
      Material Type Polyiso

      Est Delivery between and .

      Delivery will always take place on a weekday (Mon - Fri).
      For more information on delivery visit our delivery info page.

      We use cookies to improve your user experience. View Privacy Policy