If your windows look sad, they might be weeping on the inside from
condensation. Bad seals in double-pane windows can allow moisture
to build up between the panes of glass. Temperature changes cause
condensation or a “milky” appearance between the panes of glass. Now
you can add windows that will save energy costs and increase home
values, so this spring is a good time to consider repairing or replacing
leaky windows.


Check Windows Now, While it is still winter, check your windows for condensation. Energy deficient windows will be cold
to the touch in winter. The cold window surface will cool the air next to it. Cold air will move down the
window if the inside room temperature is much higher than the outside temperature. If the air is more
humid inside than outside, the cold window glass also will cause condensation.

In some cases, glass services providers, can repair the window glass, saving you
the cost of a totally new window frame and the repairs to install a complete window unit. But in some
double-pane windows, especially Insulated Glass (IG) units, you may need to upgrade your existing windows
with new energy-effi cient glass replacements.

An IG unit must have two pieces of glass and an insulating spacer, which is a metal tube around the perimeter
of the IG unit. A spacer is filled with a special moisture absorbing material called a desiccant - like
the little bags you find in a shoebox with brand new shoes. The perimeter of the entire unit is sealed with a
high grade sealant. As a result, IG units should never have condensation.
Simple Test for Drafts
Next time you feel a draft at your windows, hold a feather next to the seals and joints along the window
frame. If the feather moves a lot, the joint may be leaking.

The problem may be the window’s construction if the leak is between the frame and the sash. Measure
the window to determine if it is square, plumb and level, and look to see if the window frame is twisted. If
the window construction is poor or damaged, the glass panes may pull away from the window frame and
the seals may fail.

If the feather flutters only slightly or does not flutter at all along the seals and joints, move the feather
slowly across the face of the window glass. If the feather moves a lot, there might be cold air moving down
the surface of the glass. Condensation, temperature drafts and bad-seal drafts all can be solved by replacing
damaged windows with high-energy effi cient IG units. If you
have an older home subject to frequent temperature changes IG
units can help balance the indoor climate.

When you consider whether or not to repair or replace IG
units, consult your local Glass shop for the options available.