Grenfell Tower: is the core of ACM panels a ‘filler material’?

I have been examining three alternative rationales offered by the DCLG for their claim that the core of ACM panels is covered by paragraph 12.7 of Approved Document B2:

1. The ACM core is an insulation material or product;

2. The ACM core is a filler material;

3. All elements of the cladding system are covered, and so the ACM core is covered.

As I explained in part 1 of this series, the first of these rationales may be excluded immediately because ACM cladding has no insulation function. I showed in part 2 that common sense, logic and informed opinion rule out the third rationale, the application of 12.7 being clearly restricted to insulation and filler materials, with any further coverage limited to minor unspecified items.

In this post I demonstrate that that the core of cladding panels made of Aluminium Composite Material cannot properly be described as filler material. As I pointed out before, the DCLG itself finds this a doubtful proposition since in footnote 4 of its Explanatory Note on safety checks and testing of 30 June 2017:

with its ‘and/or’, the core is claimed to be either an insulation material/product, or an filler material, or both (but not neither!) So, according to the logic of this footnote at least, the ACM core could be just an insulation product and not a filler material at all.

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