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HEARTWOOD AND SAPWOOD MOISTURE CONTENTS The unseasoned (green) moisture contents for hardwood heartwood and sapwood are often different. The numbers in Table 1 (below) are based on sampling and you can’t take them as gospel, but for most species the sapwood moisture content will be higher than the heartwood moisture content. This information will be more meaningful when I discuss how to use sample boards to monitor the moisture content of boards in an operating dry kiln, but for the moment just look over the numbers and note that the green moisture content varies considerably for different species. (I doubt that you’ll be drying all of these species anyway.) Table 1. Average MC values for North American hardwood species5 Average Moisture Content (%) Species Alder, red Apple Ash, black Ash, green Ash, white Aspen Basswood, American Beech, American Birch, paper Birch, sweet Birch, yellow Cherry, black Heartwood Sapwood - 97 81 74 95 - - 58 46 44 95 113 81 133 55 72 89 72 75 70 74 72 58 - Average Moisture Content (%) Species Heartwood Sapwood Chestnut, 120 - American Cottonwood 162 146 Elm, American Elm, cedar Elm, rock Hackberry Hickory, bitternut Hickory, mockernut Hickory, pignut Maple, silver Maple, sugar Oak, California black 95 92 66 61 44 57 61 65 80 54 70 52 71 49 58 97 65 72 76 75 5 Source: Wood Handbook - Wood as an Engineering Material. Table 4-1. 33PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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