Sash Windows Cloudy Double Glazing Repairs of condensation within the cavity of a
hermetically sealed double glazed unit
or Insulating Glass Unit (IGU) denotes
a failure of the seal.
Where the double glazing is achieved
by the installation of secondary glazing,
condensation on the cavity surface of the
outer glass generally (but not invariably)
indicates leakage from moist air from the
room into the cavity. However, the reader
should note that it is not possible to
hermetically seal secondary windows;
therefore some migration of air from the
room into the cavity is to be expected.
Condensation can occur occasionally onthe cavity surface of the inner glass of Sash Windows when the sun is shining on the window. This means that something in the air space itself, such as an unsealed wooden separator or desiccant, contains moisture. It should be noted, however, that this source can also be responsible for condensation onthe cavity surface of the outer glass.
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