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The Celotex Cavitywall is perfect for superior performance thermal insulation in application of partial fill cavity wall insulation. It includes a polyisocyanurate rigid foam and insulation core, along with a thermal conductivity that comes out to be 0.022 W/mK. There are also aluminium foil facings with low emissivity at both the sides. This is formed through a rigid polyisocyanurate (PIR) through a blend of blowing agents with low global warming potential (GWP) and zero ozone depletion potential (zero ODP).




  • Conveniently fits in between cavity wall ties through cavity ties clips
  • Clips offer Retention
  • Gives long lasting reliable energy savings for all buildings
  • Foil facers with low emissivity provide improved thermal insulation along with cavity walls air spaces
  • Exemplary dimensional stability




  • The insulation component of this Celotex is given an A+ rating in comparison to the BRE Green Guide 2008
  • This got CE marking complying with BS EN 13165:2001
  • This is CFC/HCFC free that means zero ozone depletion potential (ODP) along with low global warming potential (GWP)
  • This is formed in accordance with BS EN ISO 9001:2000 and quality management systems by Celotex Limited




  • Size of Board: 1200 x 450 mm
  • Compressive strength: 120kPa
  • Water vapour resistance: Greater than 150MNs/g
  • Dimensional stability: DS (TH) 8

Celotex CW4000 range in cavity wall insulation is versatile insulation used in cavity wall and internal walls. Get long lasting, reliable energy savings.


Celotex CW4000 Cavity Wall Insulation


Wish to cut down the amount of heat lost from your home, lower your heating bills and reduce your carbon footprint? Celotex CW4000 insulation boards are a versatile insulation material with polyisocyanurate rigid foam and insulation core, along with excellent thermal conductivity and aluminium foil facings for an improved thermal insulation, cavity wall insulation sound proofing and zero CO2 emission. Lightweight, durable and easy to install, the boards provide reliable long-term energy savings for buildings.

Switch to Celotex CW4000 cavity wall insulation. Browse through to grab the best deals. We offer a brilliant price proposal on all Celotex cavity wall insulation materials. Each item is available at discounted rates, throughout the year. Celotex CW4000 sheets are 1.2m x 0.45m and come in packs. Each pack will carry a different amount of sheets depending on the thickness of the cavity wall insulation you require. Celotex CW4000 is specifically designed for the cavity and is tongue and grooved for optimum performance.



Celotex CW4000 Cavity Wall Insulation Board 450mm x 1200mm

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