Condensation between window panes in Lake San Marcos, CA
Condensation or fog that forms between the two panes of glass, not on the interior or exterior surface, is a sign the insulated glass unit's seal has failed. This is different from ordinary condensation on the room-side surface of a window, which is a humidity issue, not a broken seal.
What causes it
- Failed IGU seal letting humid air into the sealed cavity between panes
- Loss of the argon or krypton gas fill through the same seal failure
- Age: most IGU seals reach the end of their service life somewhere between 10 and 20 years
How it gets fixed
- IGU glass replacement when the frame and sash are sound
- Full window replacement when the frame is also compromised
Why this shows up in North County Inland San Diego
North County Inland between-pane condensation is common on 15-20-year-old retrofit vinyl installs from the region's tract-home boom.
Condensation between panes FAQs for Lake San Marcos
What is the difference between condensation on the glass and condensation between the panes?
Surface condensation (on the room-side glass) is a humidity and temperature issue that can be managed with ventilation or a warmer glass surface. Condensation between the panes means the sealed unit itself has failed and the glass needs to be replaced.
Can I dry out condensation between the panes?
No. The cavity is sealed and not accessible without replacing the glass unit. Any moisture inside will keep recurring because the seal that is supposed to keep it out has already failed.
Does condensation between panes mean I lost the argon fill too?
Almost always, yes. The same seal failure that lets humid air in also lets the insulating gas fill escape, so the window has lost both its clarity and part of its thermal performance.
Is condensation between panes common in Lake San Marcos?
North County Inland between-pane condensation is common on 15-20-year-old retrofit vinyl installs from the region's tract-home boom.
Dealing with condensation between panes in Lake San Marcos?
Free diagnosis. We tell you honestly if it's a repair or a replacement.