The design of the rainscreen cladding system on Grenfell Tower and the selection of the various components were decisions made by construction industry professionals. The professionals and contractors included parties who were contractually and professionally obliged to consider the fire safety of the building and its compliance with Building Regulations. Relevant Building Regulations in England focus on systems rather than on individual components: the external façade of a building with a storey height above 18 metres is required to “adequately resist the spread of flame”. This is a question determined not in relation to individual components but by considering the overall design and effect of the system in which they are used.

Celotex was not responsible for these judgments: it did not take them and was not able or expected to take them.