The normal moisture reading for drywall varies depending on the type of drywall and the environment in which it is installed. However, a general guideline is that the moisture content of drywall should be between 5% and 12%. If the moisture content is too high, the drywall can become damaged or moldy. If the moisture content is too low, the drywall can become brittle and crack.
There are a number of factors that can affect the moisture content of drywall, including:
If you are concerned about the moisture content of your drywall, you can have it tested by a professional. A moisture meter can be used to measure the moisture content of drywall. If the moisture content is too high, steps can be taken to reduce it, such as increasing ventilation or using a dehumidifier.