Maximum Safe Initial Moisture Content for Press-Drying Oak Lumber Without Honeycomb

Kiln-drying 1-inch-thick oak lumber usually requires 1 to several weeks. Press-drying requires only about 1 hour, but honeycomb is usually so severe that the dried lumber is unfit for any high-quality use. When red oak was first predried at low temperature from green to 30 percent moisture content (MC), honeycomb did not develop during subsequent press-drying to a final MC of 6 percent. White oak, even when predried to 16 percent MC, developed severe honeycomb, collapse, and surface checking during press-drying.

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