Moisture Mapping The Impact of Wood Moisture Content on Mold Growth
Wood Moisture Content
Wood is a hygroscopic material, meaning it absorbs and releases moisture from the surrounding environment. The moisture content of wood is expressed as a percentage of the weight of the wood. Wood with a moisture content below the fiber saturation point (FSP) is relatively stable and will not decay. However, wood with a moisture content above the FSP is susceptible to decay, mold, and other problems.
At What Moisture Content Does Mold Grow on Wood?
Mold is a fungus that thrives in moist environments. Mold spores are always present in the air, but they require moisture to germinate and grow. The minimum moisture content at which mold can grow on wood is 18%. However, mold growth is more likely to occur when the moisture content is above 25%.
Mold can cause a variety of problems for wood, including:
- Staining
- Decay
- Loss of strength
- Reduced durability
Preventing Mold Growth on Wood
The best way to prevent mold growth on wood is to control the moisture content. This can be done by:
- Using moisture-resistant building materials
- Sealing any cracks or holes in wood
- Keeping wood dry by using a dehumidifier or fan
- Inspecting wood regularly for signs of mold
Moisture Mapping
Moisture mapping is a process of measuring the moisture content of wood. The purpose of moisture mapping is to identify areas of wood that are at risk for mold growth. Moisture mapping can be used to identify areas of moisture buildup that need to be addressed, such as leaks or areas of poor ventilation.