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Some years ago I read somewhere that cut stone that had been in a fire was no longer reliable for use in substantial construction. I don't know why that should be the case, and I don't know how authoritive that pronouncement was, but if that is true, restoring Notre Dame is going to involve a lot more work than rebuilding the roof and spire.
My experience has long been that thoughtful restoration takes much longer and costs far more than new construction, but that hurried renovation costs even more in the long term. Building a new roof on overstressed walls could prove to be a bit of an embarrassment.
by Andhakari on Thu Apr 18th, 2019 at 07:55:54 AM EST

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