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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Latest articles written by our insulation experts


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.

Refurbishment can be a technically challenging area. The Celotex Technical Centre speaks to a wide range of customers every day – many of whom are looking for design advice around a refurbishment project.

Whether it is an architect working on a whole building refurbishment or a homeowner who is looking to upgrade the insulation in their own property, there is often a lot of confusion and even fear around topics such as moisture and condensation.

One area that we are often asked about is pitched roof refurbishment. When it is time to renew the roof covering, homeowners are often keen to take the opportunity to increase the thermal comfort of their home – especially if they have lived for many years in a property with little or no roof insulation.

In this blog we will look at some of the challenges of pitched roof insulation, touch upon some frequently asked questions and introduce an exciting new system – Celotex Rafter Gold. Read more »

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.

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How to insulate your loft? Things to consider.20 years ago you could walk into your local newsagent and spend your hard earned pocket money on a chocolate bar. For your shiny 20 pence piece you could buy a bar that would be more than big enough to spoil your dinner. However, when you walk into your newsagents today not only is the cost of the chocolate bar much higher but the bar itself is a lot smaller. Despite these obvious changes we still expect the same tasty experience.

This trend, to achieve the same with less space, is seen in other areas of modern life with a good example seen when we compare new housing developments with developments of 25 years ago. The need for plot optimisation sees today’s developments with 3 storey ‘room in roof’ houses, whereas developments of 25 years ago tended to have only 2 liveable storeys.

Similarly this general trend has transferred itself to the refurbishment and retrofit markets with homeowners choosing to extend their houses not only outwards but also upwards.

Celotex Insulation offers a range of solutions designed to achieve compliant U-values in the thinnest possible thickness.

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Tips on how to stop overheating in your home

Rob Warren features in his latest addition of The Bald Facts, this time with an overheating special. In ‘cool’ attire, Rob discusses some of the things you can do to prevent your home from getting too hot this summer. Check out the video and blog below to understand more.

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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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This post will cover what perimeter upstand insulation is and how it works in solid floor constructions.

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