Philip Hammond says his 鈥榰nderstanding鈥� was that material should not have clad the tower
The use of the type of cladding used to cover the Grenfell Tower in Kensington was banned in the UK, according to the Chancellor of the Exchequer, Philip Hammond.
Speaking on yesterday鈥檚 Andrew Marr programme on the BBC, Hammond was asked if the government would pick up the tab for , if it was found to have been used.
Hammond ducked the question, instead saying he believed the material was banned here.
鈥淢y understanding is that this material, which is banned in Europe and banned in the US, is also banned here.
鈥淭here are two questions around this. Are our regulations correct? Do they permit the right kind of materials and ban the wrong sort of materials?
鈥淎nd secondly, were they correctly complied with? Obviously that will be a subject the [public] inquiry will look at. It will also be a subject the criminal investigation will be looking at.鈥�
Thomas Lane, 黑洞社区鈥檚 technical editor, highlighted the detailed nature of some of the fire regulations which govern certain materials (see below).
Meanwhile the Prime Minister Theresa May faces mounting criticism over the government鈥檚 response to the disaster, which has so far claimed nearly 60 lives, while the local Conservative-led council has been similarly taken to task for not providing enough support for surviving victims of last week鈥檚 blaze.
Thomas Lane, 黑洞社区鈥檚 technical editor, writes:
Reynobond is not banned in the UK. It has a BBA certificate which includes details of the panel鈥檚 compliance with European and British fire standards and Arconic, the manufacturer of Reynobond publish the fire ratings in its technical guidance.
Reynobond PE, the panel which features a polyethylene core has been tested according to the standards set out in BS EN 13501-1: Fire classification of construction products and building elements. According to the certificate the panels have a Class 0 rating for the surface spread of flame, which is the highest rating. The certificate also says the polyethylene-cored panel has a reaction to fire classification of B 鈥搒2 and the fire-retardant version a rating of B 鈥搒1. This contradicts Reynobond鈥檚 fire certification documentation, which states the fire retardant version of the panel has an A2 rating. The highest 鈥楢鈥� rating requires materials to be non-combustible and an 鈥楩鈥� rated material is easily flammable. The polyethylene-cored Reynobond panel is regarded by BS EN 13501-1 as being combustible with very limited contribution to fire.
According to Part B, the building regulation which deals with fire safety, the external envelope of a building should not provide a medium for fire spread if it is likely to be a risk to health and safety. Any insulation product or filler material used in the external wall construction of a building more than 18m tall should be of limited combustibility. A table in Part B, diagram 40 shows what classification of material can be used in different parts of a building. It states that materials with a classification of class C-s3 鈥� combustible with a limited contribution to fire - can be used in buildings up to 18m tall. A building over 18m tall must use materials with a classification of B-s3 or better. This suggests both types of Reynobond panel would meet the requirements of Part B for the flammability of external cladding.
There appears to be a contradiction in Part B. Table A7 in the appendix defines materials of limited combustibility which must be used on buildings over 18m tall. This states a material tested to BS EN 13501-1 must have a rating of A2 鈥� s3 or better, in other words non-combustible. According to the BBA certificate neither of Reynobond鈥檚 panels would meet this requirement. Arconic鈥檚 own documentation states that the fire retardant version would have been compliant with this requirement, but not the polyethylene-cored panel.
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