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Anyway long story short part of what makes older masonry buildings work is that they are *not* well insulated. They're designed to leak heat constantly through the walls, and in healthy structures, this more-or-less maintains the appropriate thermal gradients to prevent condensation and mold, and to dry out the brick to prevent spalling during freeze-thaw cycles.

Adding insulation to these structures can fuck up that balance. It can be done, but it's tricky!