If your walls are turning black in a corner, it’s no accident: find out what it really means (and how to fix it)

Black stains on walls—especially in corners—aren’t usually about poor cleaning habits. The real culprit is often excess moisture.

In rooms with poor air circulation, such as bathrooms filled with steam, closed-up kitchens, or bedrooms that rarely get aired out, moisture in the air lingers. When it meets cold wall surfaces, it condenses—and that’s when mold begins to thrive.

Other common causes include external leaks, such as water from a broken gutter, a leaking roof, or rising moisture from the foundations. Additionally, poor insulation can create thermal bridges—cold areas where moisture gathers more easily.

Another thing people often overlook is furniture placement. When wardrobes or sofas sit directly against walls without any gap, air can’t circulate properly, allowing mold to grow silently behind them.

What To Do Right Away

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