Moisture mapping is a non-invasive technique for identifying areas of excessive moisture in buildings. It plays a crucial role in preventing mold growth and ensuring a healthy indoor environment.

### Acceptable Moisture Levels

In general, moisture levels in building materials should be kept below 16% to prevent mold growth. The following table outlines acceptable moisture levels for various materials:

| **Material** | **Acceptable Moisture Level** |
|—|—|
| Wood | 12-15% |
| Gypsum board (drywall) | < 16% | | Concrete | < 20% | | Masonry | < 10% | ### At What Moisture Level Does Mold Grow in Drywall? Mold spores are always present in the air, but they only require the right conditions to germinate and grow. Mold growth in drywall typically occurs when moisture levels exceed 16%. Excessive moisture can penetrate drywall through leaks, condensation, or flooding. Once the moisture level reaches a critical point, mold spores can germinate and colonize the drywall, creating visible growth. Mold can cause various health problems, including respiratory issues, allergic reactions, and skin irritation. It is essential to address moisture issues promptly to prevent mold growth and maintain a healthy indoor environment.