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Ladro, many excellent points thank you.

Indeed, the earlier literature only offered two choices the PE and FR, described as plastic or mineral core construction, both European class EN... B s2 d0, B s1 d0 respectively.

Neither are suitable for a tower but erring on the side of caution (for a modest cost increase) by using the higher rated, low smoke material would certainly have saved lives.

I'm no envelope specialist and I'm sure there will be much discussion of how the regs apply, but am I mistaken in thinking BR_PDF_AD_B1_2013 Sec 8.4 is the decider for a dwelling? Therefore Class 0?

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