If you see a dark patch forming, it’s best to act fast. The quicker you respond, the less likely the problem will spread.
What seems minor could be a signal of a deeper problem behind the walls. While it’s not a reason to panic, it’s certainly something you shouldn’t ignore. With the right steps, you can stop the damage from getting worse and restore your home to a healthier state.
What Causes These Black Spots? (Spoiler: It’s More Than Just Dirt)
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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