@Balthasar70 @nodoc Es wird ja immer nur von "die Verkleidung war nicht schwer entflammbar" geredet, von "nicht Brennbar" (kl. A) redet nie einer.
Zum Material und der "Freigabe" äußert sich die englische Wikipedia schon detailierter, besonders der letzte Absatz klingt nach viel aufzuarbeiten:
Scheinbar kam beim Brand zum PE und interieur noch brennendes PU dazu:
Two types were used: Arconic's Reynobond, which consists of two, coil-coated, aluminium sheets that are fusion bonded to both sides of a polyethylene core; and Reynolux aluminium sheets. Beneath these, and fixed to the outside of the walls of the flats, was Celotex RS5000 PIR thermal insulation
According to the European distributor of Reynobond Arconic's current brochure and website, the Reynobond PE cladding used was suitable only for buildings 10 metres or less tall, the higher-grade Reynobond FR to 30 metres tall, and above that height, as Grenfell Tower was, the non-combustible A2 version should be used.[95][96][97] According to the US-based manufacturer, the polyethylene version of the material is banned in the United States for use in buildings exceeding 40 feet (12 m) in height, because of the risk of spreading fire and smoke.[98] In the UK the Department for Communities and Local Government stated that cladding with a polyethylene core "would be non-compliant with current Building Regulations guidance. This material should not be used as cladding on buildings over 18 m in height."[99]
The refurbishment also used an insulation foam product named Celotex RS5000, installed behind the cladding.[100] According to its datasheet, the polyisocyanurate product—charred pieces of which littered the area around Grenfell Tower after the fire—"will burn if exposed to a fire of sufficient heat and intensity".[65][101] Celotex's Rainscreen Compliance Guide when specifying Celtoex RS5000 in buildings above 18 metres[102] sets out the conditions under which the product was tested and for which it has been certified as meeting the required fire safety standards. These include the use of (non-combustible) 12mm fibre cement rainscreen panels, ventilated horizontal fire breaks at each floor slab edge and vertical non-ventilated fire breaks. It states that any changes from the tested configuration "will need to be considered by the building designer".
In September 2014 a building regulations notice for the recladding work was submitted to the authority, and marked with a status of "Completed—not approved".[107] The use of a "Building Notice" building control application is used to remove the need to submit detailed plans and proposals to a building control inspector in advance, where the works performed will be approved by the inspector during the course of their construction. Building inspector Geoff Wilkinson remarked that this type of application is "wholly inappropriate for large complex buildings and should only be used on small, simple domestic buildings"
Wikipedia: Grenfell Tower fireMan sieht wenn dann reden wir von der - version vs. A2, dem Hersteller nach.
EDIT:
@nodoc senkrechte Streifen, meinst du vor oder nach dem Brand?
https://www.thesun.co.uk/wp-content/uploads/2017/06/rb-composite-grenfell-flats2.jpg?strip=all&w=750&quality=100
Balthasar70 schrieb:Warum nicht, vielleicht hat er auch einen Experten gefragt?
