Samples of cladding from 11 tower blocks in eight separate local authorities in the UK have failed safety tests, the government has confirmed.
In a written statement to MPs, communities secretary Sajid Javid said the tower block owners had been alerted to the safety failure.
Mr Javid said: “So far we have had samples from 11 high-rise buildings in eight local authority areas where the cladding has failed the test.
“All landlords and fire and rescue services for those local authorities have been alerted to the results and we are in touch with all these areas to support and monitor follow-up action.”
Towers across the country are being inspected by landlords, and where a form of Aluminium Composite Material (ACM) is used, samples have been taken for tests.
The government is testing up to 600 tower blocks that it believes have cladding.
Working with the Building Research Establishment (BRE), the government is testing 100 samples a day, and said it had capacity to expand if deemed necessary.
Mr Javid added: “We would urge any landlord who owns a building of this kind to send samples for testing as a matter of urgency.”
Yesterday Camden Council announced plans to strip cladding off five tower blocks in the borough which were found to have cladding which was not specified by the council.
The council is taking legal advice after tests on the cladding of five towers by the BRE found that the outer cladding on the Chalcot Estate towers had been made up of aluminium panels with a polyethylene core.
The Chalcot towers were refurbished as part of a £150m project which saw Rydon act as main contractor on the scheme that was designed by architecture practice HTA. Harley Facades provided the cladding for the project.
According to Rydon, the contract value for the refurbishment totalled £66m. The estate includes four 22-storey towers and another 18-storey tower close to Swiss Cottage.
In a statement, Camden Council leader Georgia Gould said: “The new results from the laboratory show that the outer cladding panels themselves are made up of aluminium panels with a polyethylene core.
“Therefore the panels that were fitted were not to the standard that we had commissioned. In light of this, we will be informing the contractor that we will be taking urgent legal advice.”
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