Use a dimensional change method to measure the woods moisture content

Knowing the moisture content of wood is vital for many woodworking projects. Using a dimensional change method is a reliable way to determine the moisture content of wood without relying on a meter.

Steps:

Select a sample: Choose a representative sample of the wood you wish to test.
Measure and mark: Measure the length and width of the sample to the nearest 1/16 inch and mark the measurements for reference.
Dry the sample: Place the sample in an oven or kiln at a temperature of 105-110°C (221-230°F) for 24 hours or until it reaches a constant weight.
Cool and re-measure: Allow the sample to cool to room temperature and re-measure its length and width.

Calculating Moisture Content:

The moisture content of the wood can be calculated using the formula:

Moisture Content (%) = (Initial Weight – Final Weight) / Initial Weight * 100

where:

Initial Weight is the weight of the sample before drying
Final Weight is the weight of the sample after drying

Interpreting Results:

The resulting moisture content percentage indicates the amount of water present in the wood. Generally:

Moisture content below 20% indicates well-seasoned wood suitable for most woodworking projects.
Moisture content between 20-30% indicates wood that is moderately moist and may need additional drying time.
Moisture content above 30% indicates wet wood that is not yet ready for use.

Knowing the moisture content of wood is critical for ensuring its stability and longevity in a variety of applications, from furniture making to construction.