The London apartment fire was aggravated by misused combustible construction materials

Builders misused a combustible cladding to cover the sides of London's Grenfell Tower, the apartment building where 79 people were killed in a massive fire last week, Reuters reported Saturday. The material was intended for buildings a maximum of 10 meters tall, about the height of firefighters' ladders; Grenfell was more than six times that height.

Email correspondence reveals the cladding manufacturer, Arconic, sold the siding knowing it would be used inappropriately. "While we publish general usage guidelines, regulations and codes vary by country and need to be determined by the local building code experts," Arconic said in a statement to Reuters pledging to "fully support the authorities as they investigate this tragedy."

British authorities are now reviewing other high-rises for combustible cladding, and at least four buildings have been evacuated. "I know it's difficult, but Grenfell changes everything and I just don't believe we can take any risk with our residents' safety," said Georgia Gould, leader of the Camden Council, which evacuated the four high-rises Friday. "I have to put them first."

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