The results of research carried out by the BRE (Building Research Establishment) on the burning behaviours of a range of non-ACM cladding materials has been published.
The tests were carried out on advice from the Expert Panel set up following the Grenfell Tower disaster, and found that no other materials tested performed the same, or even similarly, to the ACM PE (aluminium composite material with an unmodified polyethylene core) panels that were used on Grenfell Tower.
The green and blue lines on the graph below represent the aluminium composite cladding with an unmodified polyethylene core and it is very clear they have a higher heat release rate compared with the other materials tested, among which were Classes B and D high pressure laminate, brick slips, zinc and copper composite materials and timber.
The Expert Panel said:
"We welcome the research carried out by the BRE. This research shows that ACM PE presents an unparalleled risk of fire in external cladding. Building owners should act to remove and remediate this cladding type on any building. This important research also confirms the advice previously issued regarding other cladding materials."