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

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.

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In-built separating layer in Celotex FI5000

Celotex continues to innovate not only through improved website tools like the new and improved U-value Calculator but also through continuous development and improvement of the products we offer.

In the past 18 months Celotex has brought several innovative products to the market.  A perfect example of this is our full fill cavity wall board, Celotex CF5000, which allows designers to achieve the much desired 0.18 W/m2K in a 100mm cavity as standard

Within all Celotex product innovations the need to understand the motivations of the people installing the insulation is paramount. One often asked question from contractors and designers to the Celotex Technical Centre is why we need a separating layer on top of the insulation prior to laying screed. The need to protect the foil face of the insulation from the wet screed, stopping screed migration through the board joints and creating a vapour control layer is the answer. This practice is well established in the insulation industry and has its place when the motivation for a quick completion on site is not so great.

Floors…by Celotex has offered another approach.

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Celotex launch three new flat roofing insulation solutions

Introducing three advanced Flat Roofing solutions featuring cutting-edge thinness and thermal performance with solutions for mechanically fixed single ply and built-up applications as well as our new unique product, suitable for single ply bonded applications.

Celotex Flat Is Back - Flat Roofing Insulation

Our relationship with the UK’s installer and distribution communities has equipped us with unique insights, feedback and testing opportunities. Developed and rigorously tested over eighteen months, our new Flat Roofing products have had to meet demanding standards of integrity and performance. Read more »

Celotex Insulation at the RCI Show 2016

The RCI Show is back for it’s second edition tomorrow, opening it’s doors to roofing, cladding and insulation experts. Running over Wednesday the 27th and Thursday 28th, the RCI Show brings together the leading International and UK-based names from the roofing, cladding and insulation sectors, so you can see the very latest that the best in the industry have to offer; compare and source new products; pick the brains of the experts from leading associations; and hear about the key issues that are going to impact on your business and the sector moving forward. Celotex attended the first RCI Show back in late 2014, having a perfect opportunity to connect with roofing contractors, cladding specialists and other construction professionals. Following the success of the 2014 show, Celotex is back, and will be exhibiting on stand G8 in the middle of the hall. You won’t miss us.

Celotex insulation at the RCI Show


Celotex have some very important and exciting announcements at the show so, if you fancy a change of scenery for the next day or two, and want to find out exactly what The RCI Show and Celotex have to offer, head over to the Ricoh Arena and stop by the pink stand. We’ll have our insulation specialists on hand to answer your technical queries and will be giving you the opportunity to pick up some goodies.

See you there!

Saint-Gobain to invest £20m for new Celotex insulation production facility

Saint-Gobain UK and Ireland, the leader in the habitat and construction materials market are to invest £20million in a production facility for insulation specialists Celotex.

A planning application has been submitted for a brand new production facility for Celotex, the UK’s largest supplier of PIR insulation boards. This new facility will be located next to Saint-Gobain’s Glass manufacturing facility in Eggborough, with expected production due to begin in Spring 2017.

Celotex has been operating successfully for 90 years and making PIR in the UK since 1980. The company now employs over 220 people at its only production site in Suffolk, where there are two similar production lines to the one that will be constructed at the new facility in Eggborough. Celotex has a strong focus on innovation, technical support to the construction industry and delivering high standards of customer service. This investment will enable Celotex to ensure it continues to meet the needs of the developing market for insulation products in the UK, while also meeting the future needs of its customers.


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On October 1st 2015, Section 6 of the Scottish Building Regulations were updated to include higher targets for energy efficiency and lower target U-values to achieve across applications. In light of this, our Head of Technical, Rob Warren discusses:

  • Aim, objectives and changes for Section 6 2015
  • Importance of Thermal Comfort
  • 5 steps to Thermal Comfort including an example of compliance through SAP
  • Celotex Solutions and Specification Support




Celotex Insulation talks Thermal Comfort with Santa

rob Online(PSD)Celotex’ very own Head of Technical, Rob Warren takes to your screens again, this time providing an interesting link between thermal comfort in housing and Santa Claus. An unsurprising link, but one that works very well, as you will find out in the video! Plus a funny ‘outtake’ intro too.

Take a look, and let us know what you think.

Don’t forget to subscribe to our Youtube channel and check out our website


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

IMPORTANT: On 23 June 2017, in view of the focus on components of rainscreen cladding systems, Celotex stopped the supply of Celotex RS5000, pending further clarity. Material such as product downloads & specifications is for information only. Celotex do not currently supply a solution for buildings over 18 metres.

Celotex launches two new innovative products!

At our headquarters in Hadleigh, Suffolk, our growing team of insulation experts pride themselves in manufacturing innovative solutions for a range of applications in the construction industry. Over the past two years, we have introduced exciting new application solutions including Celotex RS5000, a rainscreen cladding product and more recently, in 2015, Celotex CF5000, our full fill cavity wall solution. We are also leading innovators with our services too, introducing the new and improved U-value Calculator as well as thermal bridging models to the Celotex Members Area.

Today, we announce the release of two new additions to our ‘best-in-class’ performance 0.021 W/mK lambda range. Celotex FI5000, a premium performance flooring solution suitable for concrete slab, beam and block, suspended timber and underfloor heating applications PLUS Celotex SL5000, a specialist concrete soffit liner solution. Both with enhanced thermal performance and installation benefits, saving time and money on-site.

So, with the introductions out of the way, let’s tell you a little more about these new product additions.

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Celotex Insulating Scotland Roadshow may have ended but its impact on the Scottish construction industry will last long after the insulation specialist’s pink campervan arrives home at the company HQ in Suffolk.

On 28th September, the campervan branded in Celotex pink and carrying a team of insulation specialists headed to Scotland to spread the word of products and services that can assist compliance to new Scottish Building Regulations. Throughout the two-week campaign, Celotex delivered a series of technical clinics at venues across the beautiful Scottish landscape and visited customers along the way. Check out the journey below….

Celotex in Scotland

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Insulating Scotland 2015 – Celotex Insulation Roadshow

Back by popular demand, the Celotex roadshow takes to the streets once more. Following the success of our 2014 Insulating Britain Campaign which saw a Celotex pink double decker bus touring England and Wales teaching over 2500 industry professionals the new UK Building Regulations, Celotex are back again, only this time with something a little more quirky.

Insulation specialist Celotex is set to launch its ‘Insulating Scotland’ campaign in spectacular fashion on 28th September when the company’s custom designed campervan begins a Scotland roadshow. Taking to the road in innovative style, Celotex insulation will be spreading the word of products and services that can assist compliance to new Scottish Building Regulations.

Celotex Insulating Scotland

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