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What do I do if i see clouding or fogging between the panes of glass?

Clouding or fogging of an insulating glass unit occurs when there is a break in the inner seal between the glass panes. As a result, condensation forms between the two panes. 

Units manufactured after January 1, 2000, have a 20-year seal warranty. If you encounter a problem with the seal of your glass, obtain the serial number from the roof window or skylight and contact customer service at 800-888-3589 from Monday - Friday  from 7:30am to 8pm EST and Saturday from 9am to 5pm EST.