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I full appreciate the importance of energy efficiency, but with the comparison drawing of a cavity wall and an enhanced wall above, the waste materials from demolition are aggregate only for the cavity wall, and a mix of aggregate, acrylic, polystyrene and mineral wool for the enhanced wall. This is true of modern construciton and retro-fitting activities int eh industry and there is not enough debate about how we will address the waste at the end of life for these buildings.

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