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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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.

Celotex FI5000 is a new approach to insulating your solid floors eliminating the need for an additional separating layer. The insulation itself features an innovative cement compatible composite facer with a built-in vapour control layer. By eliminating the need to lay a polythene separating layer the contractor can typically lay 300m² of Celotex FI5000 a day. This can be achieved simply by butting the board joints in a break bonded manner and taping these joints prior to screeding.


Underfloor Heating application with Celotex FI5000

Underfloor Heating application with Celotex FI5000

The common 120 kPa rating at 10% compression of other PIR floor insulations has its place in the market and is absolutely adequate for a number of flooring applications. However, the high compressive strength rating of ≤175 kPa that Celotex FI5000 again offers another approach.

This high compressive strength rating and excellent dimensional stability of the board allows the installer to walk on the insulation directly when installing underfloor heating systems. An additional added benefit is the increased clip retention capabilities.

Celotex FI5000, premium performance flooring solution

Not only have improvements been made in terms of receiving screed directly on the insulation and producing an extremely robust insulation board Floors…by Celotex have also considered and improved the way in which the board is packaged.  Celotex FI5000 is now packaged with corner protection and treble wrapped this improvement reduces damage to the insulation onsite.

Early feedback from architects looking to specify the product are extremely positive with the ≤175 kPa compressive strength rating allowing the board to be considered for more challenging floor build-ups. Additionally, contractors on site are also very positive commenting on the stability and quality of the board when cutting and handling.