Celotex CW4000 - PIR Cavity Wall Insulation.

Write Review
product brand
Brand: Celotex
In Stock
Product Code: CECWP
Est. Delivery: 2-3 Working Days
Shipping cost displayed in basket
£57.79 (ex VAT)
£69.35 (incl VAT)

Cavity wall insulation boards by Celotex are ideal for partial fill cavity wall insulation applications. Celotex PIR is BBA approved, which ensures a hassle-free installation and maintenance for many years. They are light in weight and fit perfectly between wall ties, which helps fasten the installation process. Celotex cavity boards also help 

PIR board with its low thermal conductivity ensures superior thermal insulation in all cavity wall applications. It also has low emissivity foil facings that reflect heat back to the source. With Celotex cavity boards it becomes easier to attain the required U-values at reduced thickness. 

Foil-facing of the cavity board insulation also acts as a continuous vapour barrier, which helps keep water and moisture-related problems away. Foam insulation boards are sustainable and environmentally friendly with an A rating from BRE Green Guide.

Cavity wall boards from Saint-Gobain are dimensionally stable. They do not sag or lose their thermal insulation over time, meaning once installed, you can enjoy saving energy and money for many years together. 

Product Specifications:

Length: 1200mm

Width: 450mm

Product Code


Boards / Pack

Coverage Area/Pack (m2)

R-Value (m².K/W)
















Key Features:

  • Celotex boards ensure long-lasting and superior thermal insulation in partial fill masonry application on all building types.
  • They easily fit between the wall ties with the cavity tie clips.
  • They do not sag over time. PIR boards have excellent dimensional stability. 
  • Cavity wall insulation boards give good energy savings all year round.
  • Sustainable and environmentally friendly product with an A rating from BRE Green Guide You can easily meet all the local and national building regulations easily while using Celotex boards. 


  • Celotex PIR cavity wall insulation boards are used in partial fill applications for all types of buildings.
  • Celotex PIR can be used in all types of cavity walls.

Thermal Performance: 

  • Low thermal conductivity ensures that the heat is kept in.
  • Celotex CW4000 also have foil facings on both sides that reflect the heat, thus preventing heat loss through radiation.
  • Once installed, Celotex boards give you energy savings for many years.

Fire Classification: 

Cavity board insulation from Celotex has a Euroclass E Reaction to Fire classification, according to BS EN 13501-1. 


  • Celotex cavity wall insulation has an A rating from BRE Green Guide, meaning the PIR insulation is sustainable and environmentally friendly.
  • All Celotex products are manufactured under Environmental Management System – ISO 14001:2015. 


  • BBA Approved (Cert no 16/5343) for partial fill cavity walls, when installed, used and maintained as set out in the certification.
  • Celotex CW4000 has obtained the BRE Global Certification Mark. Certificate number ENP413.
  • All Celotex products are manufactured under Quality Management Standard – ISO 9001:2015.
  • Celotex boards are manufactured under Quality Management Standard – ISO 9001:2015.

Average Customer Rating
Overall 0.0

Related Products

Cookies help us deliver our services. By using this website, you agree with our use of cookies. Learn more