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Celotex 50mm Cavity Wall Insulation Board CW4050 1.2m x 450mm - 5.94m2 Pack

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£69.74 Incl. VAT
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Celotex CW4050 is a partial fill insulation board for masonry cavity walls. This high-performance rigid polyisocyanurate (PIR) is available in 50mm thickness and has been pre-sized so as to fit between cavity wall ties. It's suitable for use in both new and existing builds as well as extensions, making it a versatile option. CW4050 has excellent thermal conductivity value of 0.022 W/m.K, and the innovative low emissive aluminium foil facing helps the board to achieve impressive U-values. As a result, it's among the best-performing insulation materials available on the market, bringing you reliable long-term savings.

The Celotex CW4050 has been specifically sized to fit the standard wall tie spacing requirements. This means that no cutting is required, making the board quick and easy to installed. When installed correctly, it will help you meet carbon dioxide emissions and energy use targets which have been set by the national building regulations. Last but not least, this sturdy PIR insulation boards comes with a BBA (British Board of Agrement) certificate and a BRE (Building Research Establishment) Green Guide Rating of A, which will help improve your environmental performance.

Features & Benefits: Celotex 50mm Cavity Wall Insulation Board CW4050 1.2m x 450mm - 5.94m2 Pack

  • High-performance partial fill PIR insulation board
  • Quick & easy to install
  • Suitable for 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: 50mm
  • Pack Coverage: 5.94m2
  • R-Value: 2.25m2K/W
  • Maximum weight: 1.92kg/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 50mm Width 450mm


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


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