I've seen speculation (and it is not verified) that the material used in the cladding is highly combustible but is supposed to be protected by the aluminium wrap; not wise when aluminium melts at such a low temperature.
In fact quick bit of research suggests the average house fire burns at around 593-4 °C. It is not beyond the realm of possibility for temperatures of 660 to be reached for long enough to compromise aluminium, and I know from experience cutting it that it goes very soft at a much lower temperature.
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