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Ok, I guess we'll agree to disagree here.
Most Victorian houses were knocked up out of whatever was to hand, with minimal concern for life expectancy or integrity.
I've lived in them all my life. I've worked on them. I've seen what they are made of.
Yes, you could (and ideally should) keep it going with period correct materials, I just don't think it's a practical proposition for most home owners who pick up one of these places like 6th or 7th or maybe even 38th hand.
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As opposed to the high quality buildings being built now?
No offence but you are wrong on a number of levels. If you're undertaking repairs doing them properly will ensure the building functions properly and other repairs may be less likely (loss of brick face due to inappropriate cementatious mortars etc).
No they aren't. The original techniques and materials are good for a few hundred years.
Lime mortar just needs regular upkeep (every few decades).
Its6 the juxtaposition of modern materials that is the killer.