Why Does My House Smell Musty After Rain? 8 Causes and Fixes

Updated June 2026. A musty smell after rain usually means moisture is getting somewhere it shouldn’t — roof, walls, basement, or crawl space. The smell itself comes from mold spores or actinobacteria (a soil bacteria that activates in damp conditions and smells distinctly earthy) triggered by rising humidity. Here are the 8 most common causes […]

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