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There was no Rockwool in Grenfell. Hence the statement they put out:
http://www.rockwool.com/news-and-media/news-overview/2017/2017-06-15-ROCKWOOL-on-the-London-fire-tragedy/If only there had been as it's inherently non-combustible.
If there had been a Rockwool layer under the cladding I presume that would have provided some meaningful heat savings.
I think that Jonathan Pie sketch nailed it - a veneer of giving a shit about the disadvantaged.
What efficiencies are the "upgrade" of cladding supposed to achieve? Are the heating savings significant, or are these "improvements" motivated more by the aesthetics?