Ed Sirett wrote:

25mm of high performing Celotex is the equivalent of a solid stone wall of
over 1 metre thick.


Medieval Lord : How doth the north turret progress?
Medieval Mason: With new-fangled Celotex, it will fly up, sire!
ML : Bravo my man! Will it stand against all manner of siege engines?
MM : The makers say its equivalent, my Lord. Thy clerk read unto me the
parchment of specification in the market place.

LOL

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