Double Glazed Window Cracked Inside |link| [UPDATED]

You touch the pane. It’s smooth. The crack is on the inside—but between the two sheets of glass.

You don’t usually hear it happen. There’s no smash of baseball-bat glass, no howl of wind, no obvious intruder. You simply glance at the living room window one morning and see it: a thin, silvery line, or perhaps a web of fractures, snaking across the inner surface of the glass. double glazed window cracked inside

This is the window industry’s hidden demon. Tiny, microscopic specks of nickel sulfide can be trapped in the float glass during manufacturing. Over years, these impurities slowly change crystalline structure, expanding by up to 4%. In a standard single pane, this causes a harmless chip. In a sealed, stressed IGU, it acts like a bullet from the inside. The crack often appears as a distinctive “figure eight” or butterfly shape, originating from a single point. You touch the pane