Welcome to the Celotex Insulation Blog

Here you will find the latest articles written by our insulation specialists focusing on product developments, building regulations and technical guidance notes.

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Author Archives: Daniel Steed

Dan Steed is the Marketing Communications Executive at Celotex and is the newest member of the team. A Business Management with Marketing graduate and a background in customer service, he is excited to be combining existing skills whilst gaining an insight in to the vibrant nature of the Celotex brand and ensuring its continuous development.


PIR insulation specialist, Celotex, is to return to Ecobuild for the fifth year running. The company will once again make a lasting impression with an even bigger and better stand at C143, which will host engaging seminars, launch (and demonstrate) a brand new product as well as providing all the tools, technical expertise and support that you have come to expect and rely on from the brand. Read more »

An R-value is the resistance value of particular components in construction and includes materials such as plasterboard, brick or insulation. It tells you how well these components insulate against heat and is determined by thickness. Adding them all together gives you an understanding of how well the construction will stop the heat escaping.

2016 has been a busy year of change across the UK. Leicester City Football Club conquered all to win the 2015/16 Premier League title and now sitting down in 12th (sorry to any Leicester fans out there reading this, the only way is up!). The United Kingdom has voted to leave the EU and now Great British Bake Off is switching over to Channel 4. Some might argue these things are trivial in life, but to some, they’re important changes.

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Lots of people visit our website every single month and we have over 110,000 Celotex Members’ signed up for access to our innovative digital tools, so it’s important that we let you know about what’s changed. Read more »

IMPORTANT: On 1 September 2017, Celotex took the precautionary measure to temporarily suspend the supply of Celotex FR5000, Celotex CG5000, Celotex CF5000 and Celotex SL5000 while we investigate the results of recent tests (Parts 6 and 7 of British Standard 476). Materials relating to these products are for information only.

Read More here

Cavity Wall full-fill Product Innovation for Celotex is shortlisted for The Building Awards 2016

As a company that leads the way in technological innovations, Celotex filled a huge gap in the market with the introduction of Celotex CF5000. Developed with a clear focus on maximising thermal efficiency with thinner solutions, the new and innovative CF5000 system gives architects, designers and specifiers the whole picture for full fill cavity wall applications.

Instead of choosing commercial value or performance, housebuilders using CF5000 can have both.

The industry challengeCelotex full fill insulation onsite

Cavity Wall (brick/block) is the predominant build method for the UK housing industry with 70% of 27.4 million homes built with cavity walls.

The change to Part L1a in 2013 (which sets the guidelines for new residential house builds) brought a second compliance metric, Fabric Energy Efficiency Standard (FEES).

As a result of these requirements the fabric of the building needed to be more robust, with better insulation, reduced air leakage and improved thermal bridging.

The ultimate goal: the homeowner to switch the heating on less.

Read more »

IMPORTANT: On 1 September 2017, Celotex took the precautionary measure to temporarily suspend the supply of Celotex FR5000, Celotex CG5000, Celotex CF5000 and Celotex SL5000 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. Due to this issue, the suspension of the 5000 range will continue and now includes the FI5000 and GD5000 products. Materials relating to the 5000 range products are for information only. Please note that all products in the TB4000, GA4000 below 100mm, PL4000 and CW4000 ranges manufactured after 15 December 2017 will be marketed from January as Celotex 3000 with a declared lambda value of 0.023 W/mK.

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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Since Late 2014 Celotex has launched several cutting edge products to the market. A prime example of an innovative product launched just recently, would be the Celotex FI5000 flooring Insulation, which offers a whole host of on site benefits for the installer, saving time & money. With every Celotex product launch, we always drive to understand our customers’ needs, investing the time to design insulation products that the market place is driving towards. New concrete soffit liner solution, Celotex SL5000 is another perfect example.

What is concrete soffit liner insulation?

Celotex SL5000 has redefined the approach to insulating concrete soffits.

Read more »

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