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The senior government official responsible for fire safety in buildings described combustible ACM panels as going 鈥渨hoosh!鈥� when ignited, the Grenfell Inquiry has heard.

Brian Martin used the phrase 18 months before the fire at Grenfell Tower in one of a series of bombshell emails shown to the inquiry yesterday.

He had been responding to a string of major fires in the Middle East caused by aluminium-faced and plastic-cored ACM panels, the type which were used on the flawed refurbishment of Grenfell Tower.

Replying to an email from his colleague Bob Ledsome, who had asked if there was anything officials needed to 鈥渨orry鈥� about in UK building regulations in terms of ACM, Martin said: 鈥淣othing new here. The fire is most likely to be similar to several others that have hit Dubai over the last couple of years. 

鈥淚t relates to a cladding product which is a laminate of aluminium and polyethylene (Or similar) this stuff [is] very rigid and makes nice shiny buildings.

鈥淪adly when it gets exposed to a fire the aluminium melts away and exposes the polyethylene core. Whoosh!鈥�

He added that UK building regulations were 鈥渄esigned to prevent this kind of thing鈥� because of a passage stating that 鈥渇iller鈥� materials were required to meet the tough fire rating of 鈥渓imited combustibility鈥�.

He said the plastic core of ACM panels 鈥渨ould be considered as a filler material so should not be used over 18m鈥�.

But Martin did not mention that he had been warned by a group of industry experts that ACM was being used on high rise buildings across the UK because the term 鈥渇iller鈥� was being widely misunderstood by construction professionals.

This was because the term was contained in a passage titled 鈥淚nsulation materials/products鈥�, which some in the industry interpreted as meaning that 鈥渇iller鈥� applied only to insulation. 

The inquiry has already heard that Martin attended a meeting of the Centre for Windows and Cladding Technology (CWCT) in August 2014, where he and Sarah Colwell, a scientist at the 好色先生TV Research Establishment, had agreed to publish a 鈥渇requently asked questions鈥� explainer on the government鈥檚 website clarifying which materials the word 鈥渇iller鈥� applied to. The explainer was never published.

Yesterday, Richard Harral, former head of technical policy for building regulations at the Department for Communities and Local Government, was questioned by the inquiry on Martin鈥檚 email, which he had been copied into. He said he had not been aware of the debate over the term 鈥渇iller鈥�.

Counsel to the inquiry Kate Grange QC asked: 鈥淐an you think of any possible reason why Mr Martin isn鈥檛 telling you and Mr Ledsome about the fact that he knew full well there was a debate about this within the industry?鈥�

Harral said 鈥渘o鈥�. 

鈥淗e should have done, shouldn鈥檛 he?鈥� Grange replied. 鈥淗e should have had a much longer email which explained that this was an issue that had been rumbling for some time and on which pretty authoritative bodies had raised concerns; yes?鈥�

Harral said that he 鈥渨ould have wanted him to鈥�, adding that he was not aware that any steps were being taken at the time to ascertain whether ACM was being used on tall buildings in the UK.

Grange asked: 鈥淲asn鈥檛 it just common sense to anybody looking at this information that it was screaming out for somebody to check whether we had this problem in the UK?鈥�

鈥淚n retrospect, you know, of course I wish that that鈥檚 where we鈥檇 got to鈥�, Harral said, but added that his team was 鈥渉idebound鈥� and 鈥渂eaten up鈥� by the structures of the department. 

> Also read: Government 鈥渟queezed鈥� resources of building safety review after cladding fire

Earlier, he admitted that adding an explainer to the building regulations clarifying that 鈥渇iller鈥� applied to combustible cores of cladding panels would have been a 鈥渧ery simple thing to do鈥�.

But he said that technical policy at the department had been 鈥渟uffocating鈥� and officials were not able to feel 鈥渃onfident or adventurous or forward-looking鈥�.

The inquiry has already heard that ministers had set officials a 鈥渞ed tape challenge鈥� where new regulations could only be added if existing ones were removed.

By 2016, the policy had been strengthened to mean that three regulations needed to be removed for every new one added.

Yesterday鈥檚 hearing was also shown minutes from another CWCT meeting attended by Martin where he accepted that the section on fire safety guidance on 鈥渇iller鈥� materials was 鈥減oorly written and open to interpretation鈥�.

Martin had also agreed that the heading of the passage, which appeared to suggest it only applied to insulation materials, was 鈥渕isleading鈥� and would be changed in an upcoming revision of the regulations.

Harral said he had never seen these minutes, and had never been informed that Martin and industry professionals considered the section on 鈥渇iller鈥� materials to be misleading.

Asked why Martin had said in his January 2016 email that ACM presented no problems in the UK because it fell into the category of 鈥渇iller鈥�, Harral said: 鈥淚 can鈥檛 offer you an explanation for that鈥�.

Asked if Martin had informed him about the 鈥渉istoric and ongoing鈥� use of ACM at any time before the Grenfell Tower fire, Harral said he did not recollect being informed.

In his closing statement of the hearing, Harral said: 鈥淚 find it very difficult to take in what I鈥檝e learnt over the past two days.鈥�

He added: 鈥淚 find it very difficult to understand how we鈥檝e actually come to where we are, in many ways. 

鈥淚 deeply regret the failings, my failings, that have been exposed by the evidence that we鈥檝e heard, and I can only apologise to the victims and their families of Grenfell Tower and all who have been affected. 

鈥淚 am deeply ashamed of the part that I鈥檝e played in this absolute tragedy, and I hope that we can learn key lessons about the regulatory culture we have in this country, I hope that we can learn about the need to temper our obsession with innovation and the predominance of economic theory over more pragmatic human concerns, and I hope that we end up with an industry that actually is serving the people it aims to deliver for in a way that keeps them safe.鈥�

The inquiry continues.