Moisture Mapping is a crucial aspect of diagnosing and resolving moisture issues in buildings. Understanding acceptable moisture levels is essential to prevent damage, health risks, and maintain a comfortable living environment. ### How much moisture is OK in walls? Moisture in walls is inevitable and can vary depending on factors such as climate, building materials, and ventilation. Acceptable moisture levels are typically below 15%, as higher levels can lead to mold growth, structural damage, and health problems. Specific acceptable levels may vary slightly based on the location, materials, and building codes. **Consequences of Excessive Moisture in Walls:** * **Mold growth:** Moisture provides a breeding ground for mold, which can cause respiratory issues, allergies, and other health problems. * **Structural damage:** Excessive moisture can weaken building materials, causing structural damage, cracking, and warping. * **Indoor air quality:** Mold and other moisture-related issues can significantly impact indoor air quality, leading to unpleasant odors and health concerns. * **Energy efficiency:** Moisture in walls can reduce energy efficiency, as it increases the amount of energy needed to heat and cool a space.