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USE STACK COVERS. Unless you can put your lumber under a shed roof, it’s a good idea to put stack covers on the top load of stickered lumber if you’re air-drying outdoors. Good stack covers can be made from corrugated sheet metal or any number of other materials. Weight them down or fasten them to keep them from blowing off or getting damaged. Put a sticker or bolster under the stack cover to ensure air flow over the top board. HOW FAR APART SHOULD THE STICKERS BE? The distance between the stickers needs to be the same for every layer. Putting a sticker every two feet often works well, though you might put stickers every 1’ if you expect the species to twist a lot (beech or sycamore, for example) or if you’re drying higher quality or 8/4 lumber that you really want to stay flat. If your lumber isn’t all the same length, a mix of 7’ and 8’ boards for example, the stack will have a little more integrity if you box pile your lumber (stack the lumber with the ends of shorter lengths at alternate ends of the pile) (Figure 3915). It’s important to put stickers close to the ends of your boards because placing stickers there will help to minimize end checking. Figure 39. This is a top-down view of box piling. Notice the full-length boards placed along the front and back edges of the pile; shorter boards get placed in the middle. Put stickers in place to support ends of shorter lumber – this means that your piles will have stickers at the ends as well as one foot in for 7’ lumber. Think about making a place for sample boards as you stack. WHAT SPECIES SHOULD THE STICKERS BE? The short answer is: It generally doesn’t matter as long as the stickers won’t discolor the lumber. Oak stickers are strong and last a long time, though some users have found that they aggravate sticker stain in maple. A good rule of thumb would be to use a sticker species that is similar to the wood being dried. Don’t make your own stickers out of southern pine plywood, though, because these will leave marks. HOW DRY SHOULD THE STICKERS BE? It’s important for the stickers to be dry because dampness increases the chance for sticker stain; air dry stickers are ok (around 12% MC or so is good; remember to keep stickers under cover when not in use). Wet stickers are candidates for infection by fungi, and placing infected stickers between 15 Stelzer, H.E. 2011. Air-Drying Hardwood Lumber. Publication G5550, University of Missouri Extension. http://extension.missouri.edu/p/G5550 69PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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