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Figure 45. Don't position your stacks like this! In spite of the obvious problem with this pile of lumber, this yard has tried to do things right. The piles have stack covers, the yard looks well-drained and free of vegetation, and the lumber is placed on double bunks to raise it off the ground. HOW LONG WILL AIR DRYING TAKE? The time needed for air drying depends on the species, the date and the location where the lumber is stacked. Red oak 4/4 lumber stickered in Madison, WI in January took 100 days to come to 25%, but when it was stickered in May it only took 50 days to arrive at the same MC. This should give you an idea of the variations in the length of time required, but you can refer to Table 8 in Air Drying of Lumber for more detailed estimates for different species in different parts of the country. The length of the effective air drying season increases the farther south you go. The air drying rate can be controlled to some extent by moving the stacks closer or farther apart; the lumber will dry slower when the piles are closer together. If you have a large air drying yard, the stacks closest to the center often dry quickest because there aren’t the obstructions blocking air flow that are commonly found close to property boundaries. DON’T USE MOISTURE METERS TO MONITOR DRYING PROGRESS. Some drying supervisors and dry kiln operators try to use moisture meters instead of weighing sample boards when the MC drops below 30%. Moisture meters could certainly speed up the process but (like all tools) they can be used incorrectly and that can create some expensive problems. Take the time to weigh your sample boards! Both resistance (pin type) and dielectric (pinless) moisture meters can be used inappropriately. For example, I’ve seen resistance meters used to measure the moisture content at board edges in air drying stacks, but I disagree 82PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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