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Why do insulated or thermal glass units fog?

April 26, 2017fog glass insulated Thermal units

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Why do insulated or thermal glass units fog?

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All insulated glass will eventually fail. The manufacturing process seals two pieces of glass together with a vacuum created in the center that produces the insulating effect. Assuming proper installation, ultraviolet rays and moisture are the major reasons for seal failure, which allows water infiltration causing the unit to fog. Lee & Cates Glass provides a limited 5-year warranty on insulated glass.