Double-pane windows, also called "insulated" or "thermal" windows, are made with two panels of glass sandwiched over a spacer and sealant, creating a space between the panes that is filled with ...

Double pane windows have two panes of glass separated by a spacer, and the glass and the spacer are all sealed together to form an air- and moisture-tight unit.

Finally, run a generous bead of silicone around the side of the pane, making sure to cover where the glass and spacer meet. Cover the pane with a towel for 24 hours to allow the silicone to cure.

Since the upper pane is 12 years old and has failed, it’s a pretty safe bet that the lower pane will soon lose its seal. After all, it’s 12 years old, too, and experiences the same environment.

Double-pane windows, also called "insulated" or "thermal" windows, are made with two panels of glass sandwiched over a spacer and sealant, creating a space between the panes that is filled with ...