Kingspan used the results of a fire test of a trial product to reassure contractors that a combustible insulation product was safe to use on high-rise buildings, the Grenfell inquiry has heard.

The insulation manufacturer conducted tests of a trial product in 2014 after a fire consultancy had threatened to expose the firm’s K15 insulation as not safe to use on buildings above 18m.

A product containing a different chemical composition to K15, including a new blowing agent, passed a fire test in July 2014, but the results of this test were used by Kingspan staff as evidence that K15 was safe for high-rise projects.

…