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Condensation occurs when moisture-laden warm air strikes a cold, dry surface, such as a basement wall or window. A similar thing happens with cold water passing through copper pipes. Fortunately, minor condensation issues can be reduced substantially with a few inexpensive precautions. Difficulty: Easy.
Rainwater or melted snow that isn't routed away from the house is the most common cause of basement and crawl space moisture. Runoff percolates through porous topsoil and then stops at the compact soil near the base of the foundation. Hydrostatic pressure forces the water through gaps or cracks in walls and footings.