Lurdan
old wave
Yes we have, and as I pointed out before, it's wrong. Celotex does not make the cladding panels. It's the cladding panels which have failed "safety tests" although it's not very clear what those tests are.
In your reply to me you appear to be restricting the word cladding to the Reynobond ACM panels. However the Celotex RS5000 insulation also forms part of the overall cladding system.
As you say the Celotex insulation is not being tested under the arrangements set up by the DCLG. However at the Police press conference on June 23rd Det Supt Fiona McTaggart stated that small scale preliminary tests had been conducted by the Met on samples of the Reynobond panels and the Celotex insulation from Grenfell Tower. In the report in the Evening Standard she is quoted as saying
What we are being told is that the cladding and the insulation failed all safety tests.The insulation was more flammable than the cladding. Tests show the insulation samples combusted soon after the test started.
CEP Architectural Facades and images "fabricated (ie cut to shape) two of the components in the building’s cladding system (rainscreen panels and windows) using materials, and to a design, specified by the Grenfell Tower design and build team."Everyone knows Celotex burns, and that it is a better insulator, lighter and cheaper than Rockwool, which doesn't. The spec sheet for RS5000 (pdf) shows how it should be protected from fire:
ie, it should be put behind about 1/2 hour protection. The speed with which the fire spread suggests that was not adhered to.
In a statement issued on June 23rd they stated :
Investigators have identified the role of the insulation material in Grenfell Tower. We assume they will want to understand why a class O fire spread rainscreen panel material and a class O insulation material were specified together.
Individually these materials can be integrated into a safe cladding system but certainly we recommend that in high rise buildings class O rainscreen panels should only be used in conjunction with a non-combustible insulation material such as mineral fibre.
They illustrate this with photographs from two fires in tower blocks clad with Reynobond PE and a similar product but using mineral fibre insulation.
Interestingly last Friday the Grenfell Action Group posted a PDF of the Sustainability & Energy Statement from the 2012 planning application for the Grenfell Tower refurbishment. This gives calculations of the anticipated effect of the insulation. The tables illustrating how the calculations are arrived at show that not only were they based on a system employing zinc Reynobond FR (which we know was replaced with aluminium Reynobond PE in a cost cutting exercise in 2014) but also using the more fire resistant Celotex FR5000 instead of the Celotex RS5000 that was actually used.
(Full PDF here) Here's one of the tables :
No doubt the issue who made the decision to use Celotex RS5000 instead will be under scrutiny.
Of course the issue with the Celotex insulation isn't limited to how fire resistant it is. As the Grenfell Action Group point out :
According to studies this material burns when exposed to a fire of moderate heat and intensity. Once ignited it burns rapidly and produces intense heat, dense smoke and irritant flammable gases which are extremely toxic. The toxic gases produced include carbon monoxide and hydrogen cyanide. The burning PIR attached to the exterior of Grenfell Tower is believed to have released enough poisonous hydrogen cyanide gas to potentially fill every dwelling in the building, and the simultaneous release of carbon monoxide and hydrogen cyanide is more lethal than if they are released separately.
Richard Hull who co-authored "Assessment of the fire toxicity of building insulation materials" in 2011, (PDF available here) put it a little more bluntly in an interview for Sky reported in the Mirror.
The outside wall of the building had 150mm of PIR foam (fitted), and once the fire had spread to that every flat would have its own source of PIR foam, which would have produced enough hydrogen cyanide to kill all the people in that flat
This could presumably be an issue even if fire is confined to a single area as is intended in buildings of this design.
Add in fire spread and the complete failure of the arrangements to keep the staircase relatively smoke free and this insulation is fully fit for purpose in helping to unwittingly create what radical eugenicists used to call the "lethal chamber".
D. H. Lawrence 1909If I had my way, I would build a lethal chamber as big as the Crystal Palace, with a military band playing softly, adn a Cinematograph working brightly; then I'd go out in the back streets and main streets and bring them all in, all the sick, the halt, and the maimed; I would lead them gently, and they would smile me a weary thanks; and the band would softly bubble out the 'Hallelujah Chorus'.