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How Dry Should Wood Be? In general, wood should be dried to a moisture content within two percent of its in-use MC. For furniture, cabinetry, millwork and other products used in homes or offices, the in-use MC is 6 to 8% (equivalent to 30 to 45% relative humidity, which is the typical range for interior climates in North America). Adjustments have to be made for drier humidities, such as occur during the winter in heated buildings that are not humidified, and for wetter humidities, such as along the Southern and West coast. Wood intended for use outdoors, is generally dried to higher MCs - 12 to 16% MC. Wood for bending is dried to 25% MC for severe bends and 18% for mild bends. Softwood construction lumber (2x4, 2x6, etc.) is usually dried to a maximum of 19%, 15%, or 12% MC, as governed by the American Lumber Standard requirements. The relationship between humidity and wood moisture content is the critical factor in determining in-use MCs. Temperature has no important effect. Based on spruce, the following values were established: Table I Approximate Relationship Between RH and EMC at Room Temperature RH EMC -%- -%- 00 15 3.5 30 6 50 9 65 12 80 16 90 20 95 24 100 28 6PDF Image | Principles and Practices of Drying Lumber
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