Moisture Mapping is an essential tool in any homeowner's arsenal. It can help detect hidden moisture problems that can lead to mold growth and structural damage. Acceptable moisture levels vary depending on the material and location, but generally, the following ranges are considered acceptable: * **Wood:** 6-12% * **Concrete:** < 4% * **Insulation:** < 10% **How Much Moisture is OK in Walls?** The acceptable moisture level in walls depends on the material. Consider the following: * **Drywall:** Should be kept as dry as possible. Moisture levels above 12% can lead to mold growth and structural damage. * **Concrete and masonry walls:** Can tolerate higher moisture levels (up to 25%) without significant damage, but prolonged exposure to moisture can still lead to deterioration. It's crucial to monitor moisture levels regularly, especially in areas prone to water damage, such as bathrooms, kitchens, and basements. Regularly checking for leaks and using moisture meters can help identify potential problems early on. If you suspect moisture levels are too high, it's advisable to contact a qualified professional for further inspection and remediation.