// Over the past week, the government has been testing high-rise tower blocks in England owned by councils and housing associations. All 95 of those tested so far have been discovered to be covered with an aluminium "rain-screen" exterior cladding that does not meet the required combustibility standards. You would be right to ask: how on earth can this have happened?
The short answer is: the organisations responsible for maintaining standards in the building industry have been advising contractors not to take the regulations too literally.
To understand this, it is worth starting with a document known as Approved Document B. This is the government's own set of fire safety guidance. It stipulates, at section 12.7, "in a building with a storey 18m or more above ground level any insulation product, filler material.... etc used in the external wall construction should be of limited combustibility".
That loose-sounding term - "limited combustibility" - actually has a precise definition, set out later in that document. Broadly, though, all you need to know it basically won't catch alight. And material meeting this requirement in tests will get a combustibility grade of "A2" or better.
That is the standard against which the government has been testing cladding. A government spokesperson said "a test failure means that the cladding does not meet the requirements for limited combustibility in current Building Regulations". That is to say, a failure means a breach of the official rulebook. //
http://www.bbc.co.uk/news/uk-40418266