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Celotex 75mm Cavity Wall Insulation Board CW4075 1.2m x 450mm- 4.32m2 Pack

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£75.07 Incl. VAT
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This high-performance Celotex CW4075 insulation is designed for partial fill insulation for masonry cavity walls. Made of rigid polyisocyanurate (PIR), it's available in 75mm thickness and has been sized to fit between cavity wall ties. A versatile solution, it's suitable for use in both new and existing builds as well as extensions. The board has an amazing thermal conductivity value of 0.022 W/m.K and comes with a low emissive aluminium foil facing which enables it to achieve excellent U-values. As a result, this sturdy PIR board is among the best-performing options on the market and will bring you substantial long-term savings.

Because CW4075 is sized specifically to fit the standard wall tie spacing requirements, you won't have to do any cutting is required, and the board is quick to install with the least amount of hassle. When it's installed correctly, it can help meet carbon dioxide emissions and energy use targets set by the national building regulations. And it gets better, with CW4075 having BBA (British Board of Agrement) certificate as well as BRE (Building Research Establishment) Green Guide Rating of A, which will help boost your environmental performance.

Features & Benefits: Celotex 75mm Cavity Wall Insulation Board CW4075 1.2m x 450mm- 4.32m2 Pack

  • Energy-saving partial fill PIR insulation board
  • Quick & easy to install
  • Suitable for use in masonry cavity walls
  • Low emissivity foil facings for improved thermal insulation performance in cavity air spaces
  • BRE Green Guide Rating of A
  • BBA certified

Product Specification

  • Length: 1200mm
  • Width: 450mm
  • Thickness: 75mm
  • Pack Coverage: 4.32m2
  • R-Value: 3.40m2K/W
  • Maximum weight: 2.78kg/m2
  • Thermal conductivity: 0.022W/m.K, according to BS EN 13165 for factory made rigid polyurethane foam (PU) product
  • Compressive strength (kPa): CS(10\Y)120
  • Spread of flame: Euroclass E Reaction to Fire classification, according to BS EN 13501-1. Products with this level of classification are not provided with a rating for smoke emission.


Length 1200mm Thickness 75mm Width 450mm


Thermal Conductivity 0.022 W/mK Edging Square Edge Facing Foil Product Type Board
Material PIR


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Questions & Answers


Can this be used to insulate a roof space? I'm putting a ceiling into my garage and thought this would be suitable instead of wool insulation.


This is purely designed to be used in cavity walls and is not advised to be installed into a roof space, while technically you could use it, wool insulation would work out immensely cheaper overall. 

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Celotex 75mm Cavity Wall Insulation Board CW4075 1.2m x 450mm- 4.32m2 Pack

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