Winter is indoor mold season in Canada, and there are two reasons why. First, many houses get closed up tight against the cold, so there’s inadequate ventilation. And second, when deep cold penetrates windows and within wall cavities it can cause indoor wall and window surfaces to get cold enough to trigger condensation. You can see it most commonly on window glass, but the same dynamic sometimes happens on interior wall and ceiling surfaces. This is why you can have enough moisture on, say, the corner of a bedroom wall at floor level to trigger mold growth, while overall wintertime humidity in the house is low enough to be uncomfortable. All this sets the stage for the answer to a question I get often: “How can I get rid of mold in my home, ideally once and for all?”
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