The report on the Grenfell Tower fire that killed 72 people has found that Irish company Kingspan knowingly created a "false market" in insulation for use on buildings over 18 metres in height.
Kingspan has said that its K15 insulation product made up 5% of the insulation in the tower block and that it was used without its knowledge.
The report found that the Co Cavan-based company had made a "false claim" about its product's suitability for use in the external wall of any building over 18 metres in height regardless of its design or other components.
"That was a false claim, as it well knew, because BS 8414 is a method for testing complete wall systems and its results apply only to the particular system tested," the report found.
"As Kingspan knew, K15 could not honestly be sold as suitable for use in the external walls of buildings over 18 metres in height generally, but that is what it had succeeded in doing for many years," the inquiry concluded.
The report describes as "disastrous" tests performed in 2007 and 2008 on systems incorporating the then current form of K15, "but Kingspan did not withdraw the product from the market, despite its own concerns about its fire performance," it states.
The inquiry found that Kingspan concealed from compliance certification organisation BBA the fact that the product it was selling, to which the certificate issued in 2008 referred, differed from the product that had been incorporated into the system tested in 2005.
"Moreover, the...
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