Occasional condensation is nothing to worry about. If, however, the phenomenon is recurrent or persistent despite the fact that your windows are in good condition and properly sealed, then it should be cause for concern.
Excess humidity resulting from occupants’ living habits is not the only culprit, however, when it comes to a home’s vulnerability to the dangers of condensation or mould proliferation.
What are the other guilty parties? Well, a large number of them are members of a dangerous gang known as water infiltrations and leaks: leaky roofs, aging exterior cladding and window openings, leaky plumbing, poorly drained or cracked foundations, etc. Any one of these shady characters can work in secret for long periods of time, creating plenty of dangerous humidity zones.
Source: CAA-Quebec
