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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It’s a new year which means a new start, but what were your top 8 questions of 2014? This brief blog looks at what we covered in the final Technical Twitter Takeover of 2014 pointing you in the right direction for some of the key questions sent in to us at Celotex.

Need to know where to find out about the installation of Celotex?

After some guidance on insulating walls, floors and roofs with Celotex?

Or perhaps just after some of the key benefits of using Celotex in your projects?

This post is a good starting point. So, let’s get into it! Here is the summary of the 8 questions tackled.

1.    How do I Install Celotex?

That depends upon your specific application. Celotex is suitable for use in your floors, walls and roofs. The best place to start is with our Handy Guide which is available on our website here: Our Handy Guide is a useful tool for identifying our range of product and their use, but it also includes our application installation guidelines. All applications from floors, to walls, up to roofs are included with installation guidelines in our Handy Guide.

2.    How do I insulate a flat roof?

Normally flat roofs are detailed with the insulation above the roof deck (warm roof) or below the roof deck (cold roof). Part two of our Garage Conversions Blog has some great information on upgrading flat roofs. You can visit that here:

3.    How do I cut Celotex?

We recommend using our Celotex insulation saw for best results. However a fine toothed wood saw would also be suitable. The Celotex insulation saw, Celotex insulation tape and clips can all be found in the accessories section of our website:

4.    How do I insulate a timber frame wall?

Timber frame dwellings represent some of the oldest structures in the UK, which is a testament to the versatility of timber as a building material. Typically insulation is cut to fit between the frames with an additional board across the face of the frame. Our specification guide for timber frame walls will help you in the design and specification of you wall.

5.    Where do you put Celotex on a wall?

Celotex is suitable for most wall constructions including cavity walls, timber frame walls, steel frame walls and solid walls. Celotex offer a variety of high performance insulation products suitable for wall applications. Our website allows you to quickly identify the correct product based upon your wall build up:

6.    What adhesives can I use with Celotex insulation boards?

Typically PIR insulation is designed to be mechanically fixed and not glued or adhered. However, our range of insulated plasterboards are specifically designed to be dot and dabbed. For more information on our internal solid wall insulation boards, visit

7.    What are the benefits of Celotex?

Insulation is arguably the most vital contributor to the comfort and thermal efficiency of your home. Without it you would consume endless amounts of energy to heat and cool your house, and this as we all know, costs a lot of money. As the brand leader in the UK’s largest category of insulation, Celotex PIR provides one of the most effective, thermally efficient insulation solutions to the UK construction market.

10 benefits of Celotex PIR Insulation

1. Celotex thermal performance – Whilst the typical lambda value of PIR is 0.023W/mK, Celotex’ innovative technology now offers an improved thermal performance of 0.021W/mK on  the ‘5000’ series, including Celotex FR5000 and Celotex CG5000. .

2. Low emissivity  The aluminium foil facers that cover the Celotex products are approved by third party test houses. In applications where a cavity air space is present such as a partial-fill cavity wall, this means that within the U-value calculation you can claim higher thermal value for the airspace.

3. Multiple applications – Our insulation boards provide optimal solutions for all insulations applications: floor, wall, pitched and flat roofing.

4. Thickness range – From as thin as 12mm right through to 200mm, Celotex PIR is available in a thickness range unrivalled by any other PIR provider.

5. Environmental impact – We were the first manufacturer of PIR insulation to achieve an A+ rating when compared to the BRE Green Guide.

6. Fire performance – We were the first PIR manufacturer to have Class O rated products – FR5000 and CG5000 – in our range.

7. Moisture resistance – Celotex, due to having a closed cell structure, is a hydrophobic product meaning it doesn’t absorb water. This allows the thermal performance and reliability of the product to be retained over time.

8. Structural strength – Celotex is the preferred choice of PIR insulation because it has an intrinsic structural strength. The core stops the product from sagging, and it can also cope with light foot traffic or loading.

9. Weight – Celotex PIR is a lightweight solution, easing installation and handling.

10. Life expectancy – As Celotex products don’t sag, absorb moisture or be permeated by air, you can be confident of consistent performance which will typically last the full lifetime of the building.

8. Where does Celotex sit in a roof?

Celotex is suitable for most roof constructions including pitched and flat roofs. Our website allows you to quickly identify the correct product based upon your roof build up. Visit for more information.

If you have any further questions, feel free to drop us a comment.

Top 8 Celotex Insulation Questions - Celotex

Keep your eye’s peeled later this month for a ‘Sustainability Special’ Technical Twitter Takeover with Rob Firman.

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