Grenfell Tower: Celotex updates and information

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.

Category Archives: RS5000 – Questions and answers


The 5000 series products are marketed by application for a variety of uses. All products in the 5000 series share the same foam core, and are available in different thicknesses and sizes. The facer and finishes may vary according to the intended application. The constituent elements used for FR5000 and RS5000 are the same.

Both products have been independently tested. In 2011, the material used for FR5000 and RS5000 was tested for compliance with British Standard 476, Parts 6 and 7 (for spread of flame and fire propagation), and on the basis of these tests was classified Class 0.

Celotex marketed FR5000 from the summer of 2011 for pitched roofing, walls and floors in thicknesses between 25-150mm. In 2014, we considered how we might supply the over 18m market, which is subject to additional requirements. We determined, through additional independent testing, that the product we had marketed for the below 18m market as FR5000 also met the standard required for the above 18m market for the circumstances and parameters of the test conducted. When the test had been obtained, Celotex marketed the product as RS5000 in thicknesses between 50-150mm, with client-facing information showing that it was intended for use in a rainscreen cladding system for buildings over 18m tall and explaining the testing undertaken.

We are continuing to supply FR5000 for its intended applications. We are not currently supplying FR5000 if we know that a customer wishes to use it in a rainscreen cladding system or external facade for a building above 18m, for the same reason that we have stopped the sale of RS5000.

PIR has been used as insulation for around 40 years. The use of PIR insulation in buildings below 18m is governed by different regulatory requirements and raises different issues to its use in rainscreen cladding systems for buildings over 18m. The reasons why we decided to stop supply of RS5000 pending further clarity do not apply to the use of our products in the below 18m market.

RS5000 is manufactured to a harmonised European Standard and carries a CE marking.

In 2011, the material used to manufacture RS5000 was tested under British Standard 476, Parts 6 and 7. These independent tests measure spread of flame and fire propagation (a measure of potential contribution to fire growth). The combination of these two test results leads to a Class 0 fire rating as defined in Approved Document B (guidance for Building Regulations). The material used for RS5000 has been classified Class 0. This is the highest national product performance classification for lining materials under the national fire rating system.

Celotex also submitted RS5000 as part of a rainscreen cladding system for a fire test applicable to buildings with a storey height of above 18m. It was assessed by reference to that test (British Standard 8414-2: 2005) on 2 May 2014 for the circumstances and parameters of the test with the report being issued on 1 August 2014.

You can find details about the use of RS5000 here and our product testing in a rainscreen cladding system here. You can also find a health and safety data sheet that applies to all our products here. This information states that the fire performance and classification report was issued in relation to the components specified. Any changes to those components or to the construction methods used will need to be considered by the building designer.

Celotex RS5000 is an organic product and in common with all organic materials (which are contained in furnishings, some building materials, paint and other household products) it is combustible under certain conditions. During combustion, like all other organic materials, it releases toxic gases.

The cause of the Grenfell Tower fire and the reasons why it spread as it did are currently unclear but will be established through the various investigations and inquiries which are underway. It is too soon to draw any conclusions. Those inquiries will also inform whether recommendations are going to be made for the future.

The fact that PIR insulation has been used in a cladding system for a tower block does not mean that a parallel can be drawn with Grenfell Tower. It is not simply the choice of materials, but the construction of the building and the way in which all components of the rainscreen cladding system have been used in each particular project which is important.