I’ve been studying a lot of leaded stained glass windows in my area, and one thing I keep noticing is how many of them seem to sag or cave in. It usually looks like there’s just not enough structural support, like no steel rebar or internal bracing From your experience restoring leaded windows, is there one common issue you see when it comes to their structural integrity?

Lack of rebars, soft leads, not well engaged rebars into the frames, faulty soldering .

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