Moisture Mapping is a valuable tool used to identify and assess moisture problems within buildings. It involves measuring and recording moisture levels in various parts of a structure, including internal walls. Understanding acceptable moisture levels helps determine the severity of moisture issues and guide appropriate remedial actions. ### Acceptable Moisture Levels for Internal Walls Moisture levels in internal walls are typically expressed as a percentage of dry weight. Acceptable moisture levels vary depending on several factors, including the type of construction, age of the building, and climate. Generally, the following guidelines can be used: * **Acceptable:** Below 16% * **Caution Zone:** 16-20% * **Unacceptable:** Above 20% Moisture levels above 20% are considered unacceptable, as they can lead to mold growth, structural damage, and health risks. It's essential to address moisture problems promptly to prevent these negative consequences. ### What Should Moisture Readings Be for Internal Walls? When conducting Moisture Mapping, readings should be taken at various points throughout the internal wall, including: * Base * Middle * Top * Inside corners * Around openings (e.g., windows, doors) Moisture levels should be below 16% at all measurement points. Readings above 16% but below 20% indicate a potential moisture problem that warrants further investigation. Readings above 20% suggest significant moisture intrusion and require immediate attention. By understanding acceptable moisture levels and conducting regular Moisture Mapping, building owners and managers can proactively monitor moisture conditions, identify potential problems, and take appropriate actions to maintain a healthy and safe indoor environment.