carpet pad mold 5

https://wiki-book.win/index.php/How_to_Identify_Mold_Under_Carpet_Before_It_Spreads

If your carpet pad has mold, it's often due to moisture trapped underneath, like from a spill or high humidity. You might notice a musty smell or see black spots. It's not just a dirt issue; mold can damage both the pad and flooring, and it can affect indoor air quality, especially for allergies. Fixing the source of moisture is key.