50mm Celotex CW4050 Cavity Insulation - 1200mm x 450mm - 11 Boards

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This Celotex CW4050 is a partial fill insulation for masonry cavity walls. It is a high-performance rigid polyisocyanurate (PIR) material which is available in 50mm thickness and has been pre-sized so it can 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 insulation has excellent thermal conductivity value of 0.022 W/mK, and the innovative low emissive aluminium foil facing helps it to achieve impressive uValues. As a result, it's among the best-performing insulation materials available on the market, bringing you reliable long-term savings.

  • Quick & easy to install
  • High-performance partial fill PIR insulation board
  • Low emissivity foil facings
  • Improves thermal insulation performance in cavity air spaces
  • Suitable for masonry cavity walls
  • CS(10\Y)120 compressive strength (kPa)

Celotex CW4050 insulation board has been specifically sized to fit the standard wall tie spacing requirements. This means that no cutting is required, making it quick and easy to be installed. When fitted correctly, it will help you meet carbon dioxide emissions and energy use targets which have been set by the national building regulations.

Thickness: 50 mm
Length: 1200 mm
Width: 450 mm
No. Boards: 11
Coverage: 5.94 m²
R-value: 2.25 m²K/W
Thermal Conductivity: 0.022 W/mK
Maximum Weight: 1.92 kg/m² 
Certification: BA 16/5352 BBA  17/5405
Country Origin: UK


The R-value denotes the resistance to heat flow – the higher the R-value the more insulating the product is.

What's more, this sturdy PIR insulation comes with a BBA (British Board of Agrément) certificate and a BRE (Building Research Establishment) Green Guide Rating of A, which will help improve your environmental performance.

  • Thermal conductivity: 0.022W/mK, according to BS EN 13165 for factory made rigid polyurethane foam (PU) product
  • BRE Green Guide Rating: A
  • Spread of flame: Euroclass F 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.
  • Certification: BBA certified
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