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What causes condensation to appear between the panes of insulated glass units?

April 26, 2017appear causes CONDENSATION glass insulated panes units

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What causes condensation to appear between the panes of insulated glass units?

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A. An insulated glass unit consists of two panes of glass with an aluminum spacer and a sealant that is supposed prevent moisture from infiltrating the unit. If this seal fails or is broken in any way moisture will condense on the inside of the glass producing a “foggy” or cloudy look. This also reduces the energy efficiency of the unit.