Important Information: For all updates and Celotex announcements since June 2017, please see the links below...  See more

Declared lambda values - Read more >

5000 Class 0 testing - Read more >

Rainscreen cladding & RS5000 - Read more >

Insulation for Masonry Partial Fill Cavity Walls

Insulating a cavity wall insulates a building without impacting on internal living space.

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IMPORTANT: On 1 September 2017, this product (among others) was temporarily suspended while we investigate the results of recent tests (Parts 6 and 7 of British Standard 476). In addition, we have recently identified a compliance issue relating to our calculation and testing of the declared lambda value of products in the 4000 and 5000 ranges and the Crown-Bond and Crown-Fix products within the Crown Flat Roofing range. Please note that CW4000 manufactured after 15 December 2017 will be marketed from January as Celotex CW3000 with a declared lambda value of 0.023 W/mK. Materials relating to this product are for information only.

Please use the link below to read our full statements regarding declared lambda:

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Please use the link below to read our latest statement regarding Class 0:

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Celotex partial fill masonry cavity wall insulation boards have excellent dimensional stability and are conveniently sized for installation between cavity wall ties.

Application Benefits:

  • Easy to fit between wall ties using cavity tie clips for retention
  • Low emissivity foil facers enhancing thermal performance within cavity air spaces
  • Provides reliable long term energy savings for buildings

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