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 Full Fill Masonry Cavity Walls

Premium performance PIR insulation board for use in full fill masonry cavity walls

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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. Materials relating to this product are for information only.

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

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

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Cavity wall construction still remains the predominant build method within the UK consisting typically of a masonry inner and outer skin, separated by a cavity forming one part of a whole house approach. Within England, Scotland and Wales, both partial fill and full fill cavity wall insulation provide specification choices depending on the project's commercial and performance requirements. Celotex have extended their cavity wall portfolio, with premium performance insulation solutions for both partial fill and, with this latest addition, full fill masonry cavity wall applications.

Celotex CF5000, our full fill cavity wall PIR insulation, simplifies Building Regulation compliance with a U-value of 0.18 W/m2K, maximising thermal performance without the requirement to widen the cavity. Walls are key to the building footprint, so if the cavity is widened to accommodate thicker insulation this will impact plot efficiencies. Not to mention the requirement of longer wall ties, sized lintels and cavity closers etc. With 97mm thick CF5000 PIR insulation in a 100mm cavity, these requirements are eliminated.

Designed with installation efficiency in mind, CF5000 comes in 1200 x 450mm dimensions to fit standard cavity wall tie spacing as well as ease of cutting. CF5000 also includes a mechanically engineered rebated edge profile ensuring that the passage of moisture through the wall is eliminated.

For specification details, design considerations and installation guidelines, download the Full Fill Cavity Wall Specification Guide

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Recommended Products

CF5000 (Currently Suspended)
1200 x 450mm
(Currently Suspended) 97mm insulation for 100mm cavities
0.021 W/mK

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