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Figure 43. Cantilevered sample boards used for lumber that has been previously air-dried. USING THE AIR-DRYING YARD AND/OR SHED. Air drying takes time, and it’s intuitive that drying will progress faster in the summer months than in the winter months. In hot, windy conditions drying can progress too quickly for species that check easily (such as oak), so you have to be attentive. If the lumber is drying too quickly, consider moving the lumber stacks closer together. Sometimes different parts of the air-drying yard have higher humidity than others, so if that’s the case you have options for stack locations. Shade-Dri® screening cools the lumber and protects it from small gravel on the air drying yard, and many find it very useful for restricting the air flow in sheds as well. Stack alignment might affect the drying rate; one study found that aligning the boards parallel with the predominant wind direction actually gave the best airflow through the lumber. Be cautious with slow-drying lumber. It’s easy to overlook a stack of lumber that dries slowly, and one day you might find it’s sprouting mushrooms. To avoid this problem, be sure that your lumber sits on a well-drained location, atop bunks that support the lumber 12”–18” above the ground (use the higher figure for sites with poor air flow or for sites with so-so drainage). Aim for enough air flow beneath the stack that the ground moisture levels won’t create a biological minefield. Make sure that vegetation is kept clear from around the base of these piles. Plants cut down the air flow and let the humidity build up under the lumber. Finally–and this is important!–, remember that this lumber may be sitting in one place for several months – when you put a pile of lumber on the yard, make sure that the bunks and the stickers all line up with each other and that the stacks are level. See Figure 44. 80PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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