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Brent Hull revisits a long-standing frustration with insulated glass in historic window restoration, explaining why traditional sealed units tend to fail within a couple of decades and distort the look of authentic mutton bar profiles. He walks through how newer vacuum-insulated glass technology, developed by a Belgian glass manufacturer, addresses both problems at once: dramatically improved energy efficiency alongside a slim profile that preserves historic proportions. Hull contrasts earlier vacuum-glass attempts, which left a visible suction-point blemish, with a refined process that eliminates that flaw entirely, describing how the shift finally makes it possible to build historically accurate, long-lasting windows without compromising performance or appearance.

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