Records show that a contractor installed "over-cladding with ACM cassette rain screen" during the recent refurbishment at Grenfell Tower. The term ACM stands for aluminium composite material. With this kind of material, the choice of insulation core material determines how easily it can be burned. Several tower building fires have involved the same external materials, including the 2009 Lakanal House fire in Camberwell, London, the 2009 Beijing Television Cultural Center fire and the 2015 fire at The Marina Torch, Dubai. Sam Webb, the architect who investigated the Lakanal fire and who sits on the All Party Parliamentary Fire Safety & Rescue Group, said "This tragedy was entirely predictable, sadly."