The maker of the panels used to clad the London tower block where at least 30 people died in a fire this week advised customers against using its polyethylene-cored tiles in high rise buildings.

Diagrams in a brochure dated 2016 for Reynobond tiles reviewed by Reuters show how polyethylene (PE) core tiles are suitable only for buildings of up to 10 metres in height. “As soon as the building is higher than the firefighters’ ladders, it has to be conceived with an incombustible material,”…