In my last post, I introduced an Agrément Certificate issued by the British Board of Agrément (BBA) to Sto in 1995 for an External Wall Insulation System. Examining the version of the system with combustible Expanded Polystyrene (EPS) insulation, I first questioned the basis on which it had been granted a Class 0 Reaction to Fire rating (Detail Sheet 2):
Then I expressed alarm that the BBA granted approval for the system to be used at any height:
in apparent direct contravention of the restriction, introduced into Approved Document B in 1992, of the use of combustible insulation to buildings of 20 metres or lower:
I sent an email to the BBA on 15 April to ask whether they now believed the Certificate was issued in error, but have not so far received a reply.
Continue reading Grenfell Tower: Why, in 1995, did the BBA see no additional hazard in using combustible render rather than non-combustible?