Moisture mapping is a crucial technique used to assess the moisture content of buildings and structures. By understanding the acceptable moisture levels, property owners and managers can take proactive measures to prevent moisture-related problems.

### Acceptable Moisture Levels

**Wood:** Acceptable moisture levels for wood vary depending on the species and use. However, generally, moisture content should not exceed 12-15% in framing lumber and 7-9% in finished wood.

**Masonry:** Masonry materials, such as brick and concrete, can tolerate higher moisture levels. However, prolonged exposure to moisture can weaken these materials and lead to structural issues. Acceptable moisture levels in masonry should typically not exceed 4-6%.

**Insulation:** Insulation loses its effectiveness when wet. Therefore, maintaining low moisture levels in insulation is essential. Acceptable moisture levels in insulation vary depending on the type, but generally should not exceed 1-3%.

### What is a Bad Moisture Reading?

**High Moisture Readings:** Moisture readings above the acceptable levels indicate excessive moisture in the material. This can be caused by leaks, condensation, or poor ventilation. Left unattended, high moisture levels can lead to mold growth, wood rot, and structural damage.

**Low Moisture Readings:** While excessive moisture is a concern, extremely low moisture readings can also be problematic. Drywood termites can infest wood with moisture levels below 9%. Additionally, low moisture levels can cause wood to shrink and crack.