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My windows aren't leaded, but the glued-on wooden strips may have an effect if they absorb moisture and expand.

A few weeks before Christmas we suffered a similar problem (breaking glass) with six of our double glazed units fitted in Georgian sash hardwood frames, all cracking within a 3 week period. A single DG unit is fitted in each sash, with the glazing bars glued to the outside with silicone. All...