Particular concerns have been raised about the cladding on the outside of buildings for a number of years, which experts say may have accelerated the inferno which consumed the 24-storey Kensington block in just 15 minutes.
It has since emerged that the United States had banned the type of cladding thought to have been used on Grenfell Tower.
The material used on Grenfell Tower was sold under the brand Reynobond which comes in three different varieties: one with a flammable plastic core and two with fire-resistant cores and the cheaper, more combustible, version was banned in the United States in buildings taller than 40 feet.
It is thought that Grenfell’s exterior cladding, added in 2015, had a polyethylene – or plastic – core but conforms to UK standards.
Reynobond’s fire-resistant panel sells for £24 per square metre; £2 more expensive than the standard version.
Theresa May has ordered a public inquiry into the fire as she promised that all residents would be rehoused locally.
It came as police admitted that the death toll could reach 100 and senior officers conceded the true scale of the disaster may never be known.