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I'm having a moisture problem on a wall on the second floor. In case of rain, this wall is done, the wallpaper is off. I had the window changed 6 years ago, it is wooden. Outside this wall has a slight crack, how to know if it is a problem of condensation, or a seepage of rainwater?

Condensation phenomena are not related to rain but to temperature variations, including the thermal shock between a warm interior wall and a cold exterior facade. In your case, it is obvious that this is not the case, but an infiltration by the crack in frontage in rainy weather.

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