By Barry Stone
Dear Barry,
How do I check thermal pane windows to make sure the seals are still intact? I've noticed moisture condensation between some of the dual panes and plan to have them replaced under the manufacturer's warranty. The manufacturer, however, has asked me to list all the windows that are defective. The condensation is obvious at three windows, but I suspect problems at others. I've heard that holding an ice cube against the glass can test window seals. Does this sound plausible?
--Mike
Dear Mike,
Applying an ice cube to a dual pane window will cause visible moisture condensation only if there is moisture present between the panes. If a dual pane seal has leaked in the past and all the moisture has since evaporated, then applying the ice will do no good. However, dual pane windows that have leaked and then become dry always have residual water stains on the inside surfaces of the panes. Sometimes, these stains are very faint and difficult to see. But, when light hits the glass at just the right angle, it is usually possible to discern the stains, although you may have to look very closely. Fortunately, some window manufacturers have lifetime warranties, enabling you to make future claims if other window seals should leak. Check with the maker of your windows to determine the duration of its warranty.
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