Moisture mapping is the process of measuring the moisture content of a building envelope. This information can be used to identify areas of moisture intrusion, assess the severity of the damage, and develop a plan for remediation. ### Acceptable Moisture Levels The acceptable moisture level for a building envelope varies depending on the material and the climate. However, as a general rule, the moisture content of a building envelope should not exceed 20%. Moisture levels above this threshold can lead to a number of problems, including mold growth, rot, and structural damage. ### What is a Bad Moisture Reading? A bad moisture reading is any reading that exceeds the acceptable moisture level for the building envelope. This can indicate that there is moisture intrusion, which can lead to a number of problems. The severity of these problems will depend on the location and extent of the moisture intrusion. If you have a moisture reading that exceeds the acceptable level, it is important to contact a qualified professional to investigate the cause of the moisture intrusion and develop a plan for remediation.