Steamy Windows Repair 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 on
the cavity surface of the inner glass 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 on
the cavity surface of the outer glass.
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