Grenfell Tower disaster: how did the fire spread so quickly?

In current design practice, some buildings even include special design measures for fires, such as refuge rooms for occupants in the higher storeys, who could have trouble escaping down stairs. There are also active fire protection methods such as using sprinklers. Though a parliamentary report following the 2009 Lakanal House fire in Camberwell, London, in which six people died, recommended that sprinkler systems be installed in tower blocks across the U.K., it’s not clear that these measured were implemented in Grenfell Tower. A local residents action group also claimed that their warnings about a lack of fire safety measures “fell on deaf ears”.

Materials matter
The fire risk level of any building also depends on its structural design – that is, the capacity of its materials to resist fire. Different materials receive different fire ratings in each design. For example, steel buildings are normally required to have structural elements such as beams or columns that can stand for one to two hours with the help of fire protection material such intumescent paint, which swells up when heated to protect the material beneath.

According to reports, the key structural components of Grenfell Tower are mostly made of concrete – a material which rates highly in terms of fire resistance. While other materials can buckle in high temperatures, concrete structures can help to prevent the collapse of a building in case of fire, as well as making it safer to use helicopters – which can dump up to 9,842 liters of water at a time – to extinguish the blaze.

There were also reports relating to cladding added as part of an £8.7m refurbishment in 2016. The material used for the cladding was primarily aluminium, which is not fire resistant. What’s more, aluminum has high conductivity – so the cladding itself could have heated up very quickly, failing to prevent the fire from travelling through the windows and up the exterior of the block from one story to another.

In truth, most old buildings do not conform to the latest guidelines for fire safety design, so it is imperative to update them by installing sprinklers, fire alarms and extra fire evacuation staircases. While those affected may have to wait for some time before the causes of the fire become clear and responsibility is taken, landlords and local councils can act now to help prevent another disaster of this scale from happening again.

Feng Fu is Lecturer in Structural Engineering, City, University of London.This article is published courtesy of The Conversation (under Creative Commons-Attribution / No derivative).