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The government took no action to ban ACM cladding despite being shown 鈥渃atastrophic鈥� results of a fire test on the material 16 years before the Grenfell fire.

Tuesday鈥檚 hearing of the Grenfell Inquiry heard that experts had been 鈥渟hocked鈥� by the performance of the ACM cladding, the same type which was used on the refurbishment of Grenfell Tower.

The test, commissioned by the government and carried out by the 好色先生TV Research Establishment (BRE), used a mock-up of a building鈥檚 external wall on a 9m high test rig and was intended to run for 30 minutes.

Within four minutes, a rapid spread of flame resulted in maximum temperatures for both the external and internal parts of the structure being reached.

The test had to be stopped at the five minute mark after flames had reached 65ft, more than twice the height of the rig. 

鈥淚t was very rapid, very large fire growth,鈥� Sarah Colwell from the BRE told the inquiry.

Despite the result of the test, the material achieved the highest official standard for fire spread, Class 0.

But Colwell said she was 鈥渟hocked鈥� at the speed of the fire spread, adding that both the BRE and government officials were 鈥渁ll concerned at the performance of the product鈥�.

Asked by inquiry to the counsel Kate Grange QC if the test results showed that the use of ACM on high rise buildings would be a 鈥済rave risk鈥� to occupants, Colwell replied: 鈥淚 genuinely鈥�yes, I couldn鈥檛 see that ACM would be an appropriate product for use in that application.鈥�

Colwell said that the government was made aware of the outcomes of the test and 鈥渢hey were obviously then in a position to take the dissemination route that they would do with that鈥�.

But she said that she was not aware of officials ever alerting third parties in the construction industry about the test results. Asked if this concerned her at the time, she said: 鈥淚n retrospect, yes, but at the time, I wasn鈥檛 aware that they hadn鈥檛, so therefore鈥� I鈥檓 still shocked that it is and was used. 

鈥淪o, yes鈥� with reflection, I am shocked that they didn鈥檛 follow it up at that time.鈥� 

But she admitted that the BRE had also not alerted third parties in the construction industry about the test because this was 鈥渘ot something we would do from the type of contract work we were involved with鈥�.

ACM continued to be used on hundreds of tall residential buildings for the next 16 years, with its use only stopped after the fire at Grenfell tower which claimed 72 lives in June 2017.

The inquiry continues.