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When a window is in direct sunlight, the rise in
temperature between the panes makes the air
molecules more active, increasing pressure in
the chamber and on the glass and seals.
Conversely, as the temperature drops, negative
pressure is exerted on the glass and seals, and
humid air is drawn into the window. This is why
most failed windows are found on the south
facing side of the home or business.
Most windows are designed with this in mind and
are built with moisture absorber materials
behind the spacer bars. Over time, the absorber
material becomes saturated until it reaches
capacity and begins to fail with age. When this
happens, the additional water vapor remains in
the window when the unit is exposed to the sun's
energy. As the window cools, the water vapor
trapped between the panes condenses and clings
to the panes, making the window look "foggy" or
"wet".
Visible fog, condensation, and moisture are
signs the sealed window unit has simply reached
its threshold to absorb moisture. This is a
repairable and preventable condition.
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Did you Know? |
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In addition to
decreased visibility, the window's thermal
properties are diminished, requiring more energy
to heat and cool your home or business. |
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