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Figure 42. This diagram shows a kiln sample pocket in a stack of ten-foot lumber. The gray sticker above the sample board should be shorter than the rest to make it easy to remove and replace the sample board. The stickers supporting the ends of the sample boards can be shorter than the rest. Sample boards need to be in a location where the air flow is going to be similar to the rest of the lumber, particularly for lumber above 30% MC. Mark both the sample boards as well as the surrounding lumber so you can put the sample boards back in the original locations after weighing– don’t shift them around. If you know that your kiln dries differently in different locations you should take that into account as well, though a better practice would be to figure out why the drying is nonuniform and fix any issues you find. If your kilns is built to hold only eight- or ten-foot lumber you will find that at least one of the boards on the end of the pile next to your sample board is pretty short (as in the figure above). It’s tempting to put sample boards in between stacks (between the bolsters) instead of making sample pockets and short boards but the air flow and overall exposure is going to be different from what it is inside the stack. Some people use short stickers to cantilever sample boards off the sides of previously air-dried lumber stacks for easy stacking and easy access (Figure 43). This is not a good practice for green lumber being dried in a kiln or for lumber which is being air-dried, but if you are putting well air-dried lumber (below 20–25% MC or thereabouts) into a dry kiln the placement of sample boards is less critical. 79PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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