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Moisture Mapping A Guide to Wood Moisture Content

Understanding Wood Moisture Content

Moisture content is a crucial factor in assessing the quality and performance of wood products. Wood moisture content (WMC) refers to the amount of water present within the wood’s structure. It directly impacts the wood’s shrinkage, swelling, strength, and durability.

What is the Moisture Content in Wood?

Wood is a hygroscopic material, meaning it tends to absorb and release moisture from the surrounding environment. The moisture content of wood is expressed as a percentage of the weight of the wood’s oven-dry mass. Wood that has been dried to a temperature of 103°C (217°F) until its weight no longer changes is considered oven-dry.

The moisture content of wood varies depending on several factors, including:

  • Species: Different wood species have inherent differences in their ability to absorb and retain moisture.
  • Environmental Conditions: Temperature, humidity, and air circulation significantly influence the moisture content of wood.
  • Processing: Drying, treating, and finishing processes can alter the initial moisture content of wood.
  • Storage: Improper storage conditions can lead to changes in the moisture content of wood over time.