Celotex CW4040 Cavity Wall Fill 40mm Cavity wall Insulation
Celotex CW4040 Cavity Wall Fill 40mm Cavity wall Insulation
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Celotex CW4040 Cavity Wall Fill 40mm

SKU: celcav40

Est Delivery between and .

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

The Celotex CW4040 Cavity Wall is a fantastic thermal insulation product designed to partially fill insulation for masonry cavity walls. This rigid polyisocyanurate (PIR) insulation board fits between cavity wall ties, insulating the air spaces in the cavity. It’s perfect both for new and existing builds, as well as project extensions.

This Celotex Cavity Wall insulation consists of a polyisocyanurate rigid foam and an insulation core. Having a thermal conductivity that comes out to be 0.022 W/mK, Celotex offers the ability to achieve desired U-values for the walls of the building without any problems.

This CW4040 Cavity Wall insulation is a smart solution offering long-lasting and substantial energy savings for all types of construction projects and buildings. There are aluminium foil facings with low emissivity on both faces to provide better strength and superior dimensional stability. The clips offer extra retention to the material. These unique features make this PIR Celotex Cavity Wall insulation one of the best-performing insulation materials available on the market.

The Celotex CW4040 is formed by combining blowing agents that contribute to low global warming potential (GWP) and zero ozone depletion potential (ODP).


  • Polyisocyanurate rigid foam
  • Cavity tie clips to offer retention
  • Energy-efficient insulation
  • High dimensional stability
  • Lower U-value
  • Excellent reaction to fire
  • Water-vapour resistant: Yes


  • Brand: Celotex
  • Coverage: 7.56m2
  • Length: 1200mm
  • Material type: Polyiso
  • Thermal conductivity: 0.022 W/mK
  • Thickness: 40mm
  • Width: 450mm
  • Board weight: 2.48kg
  • R-Value: 1.80m2K/W
  • Compressive strength: 120kPa


Store in cool and dry conditions, preferably inside on-site.


Celotex is certified with an A+ rating compared to the BRE Green Guide 2008 and CE marking complying with BS EN 13165:2001. The Celotex Cavity Wall is developed under BS EN ISO 9001:2000 and quality management systems by Celotex Limited.

Length 1200mm
Width 450mm
Coverage 7.56m2
Thermal Conductivity 0.022 W/mK
Thickness 40mm
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.

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