Window condensation vs failed glazing seal
The pane surface and whether moisture can be wiped away provide the decisive clue.
◌Surface condensation
VS▦Failed insulated-glass seal
Typical location
Cold windows, corners, frames, pipes and poorly insulated surfaces
Inside one sealed glazing unit
Timing fingerprint
Cold weather, showering, cooking or overnight occupancy
Can vary with temperature but cannot be wiped away
Visible or audible pattern
Diffuse droplets, wet edges or recurring surface spotting
Fog, haze or mineral residue trapped between panes
Best separating check
Record surface temperature and indoor humidity together
Try cleaning both exposed surfaces and compare adjacent units
Evidence that weakens it
Direct liquid path after rain
Moisture wipes from the room-side glass
The rule
Use this comparison in Clue Engine →Do not repair the resemblance. Verify the pathway.
Color and shape can overlap. Timing, location and a repeatable check usually carry more diagnostic weight.
