How manufacturers sold combustible cladding When Marcio Gomes found out that Grenfell Tower, where he lived, was going to be covered in cladding, he assumed it must be safe. Today we know this material was the main cause of the spread of the fire at Grenfell Tower. The cladding installed on the tower was made by French company, Arconic - it was highly combustible. Prior to the fire at Grenfell, Arconic staff were warned that covering a tower block in this material could add the fuel power of an oil tanker to the outside walls. Why did they sell it anyway? And how was that allowed? Presenter: Kate Lamble Producer: Josephine Casserly Production coordinator: Janet Staples Audio engineers: James Beard and Gareth Jones Story consultant: Simon Maybin Editor: Penny Murphy