Moisture Mapping A Comprehensive Guide to Wood Moisture Content

What is Moisture Content in Wood?

Moisture content (MC) refers to the amount of water present within wood. It plays a crucial role in various aspects of wood performance, including its strength, stability, and susceptibility to decay. Understanding the MC of wood is essential for proper wood handling, processing, and use.

In general, the MC of wood is expressed as a percentage of the oven-dry weight. Oven-dry weight refers to the weight of wood after being dried at a standardized temperature (typically 103°C or 217°F) until it reaches a constant weight.

Influence of Moisture Content on Wood Properties:

• Strength: Higher MC reduces wood’s strength, as water acts as a lubricant between wood fibers, weakening their bond.
• Stability: Wood undergoes movement (swelling or shrinking) as its MC changes. This can lead to distortion and cracking if not controlled. Stable MC levels are crucial for maintaining structural integrity.
• Decay Resistance: High MC increases the risk of wood decay due to favorable conditions for fungal growth. Controlling MC through proper storage and treatment helps prevent decay.