Washington Winter Home Alert: Basement Moisture Risks Rising in Seattle, Tacoma, and Spokane This January

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January is an important — and often underestimated — time for basement moisture concerns across Washington. While winter temperatures vary widely from west to east, seasonal rain, snowmelt, and temperature swings can quietly increase the risk of condensation and moisture buildup below ground.

During mid-winter, warm indoor air from heating systems frequently meets cooler basement walls, floors, and foundation surfaces. This temperature contrast can cause condensation to form on concrete, windows, and exposed pipes. Over time, moisture may accumulate, leading to damp areas, musty odors, or subtle staining — early indicators that basement humidity levels may be rising…

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