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Warp board2/26/2023 ![]() ![]() ![]() Other confounding factors contributing to warp Twisted slats or frame would prevent the piece sitting flush against the wall. But if you are doing rustic sign that is framed, or a framed shiplap the twisted boards can ruin the whole project. ![]() Some projects you can live with a good deal of warped lumber. The end result is kind of like some giant came and manhandled the board as you would ring out a rag (OK, not that bad – but you get the idea). Aka it was the center of the trunk or limb. Almost every board that exhibits this situation has the center growth ring in the end grain (or close to it) or close to it in my experience. This is when two opposite corners that are diagonal from each other are raised, while the other two are firmly on the table. 1/8″ (3 mm) Crook in a 4′ board 1/4″ (6 mm) bow in the middle of a 4′ (~1.3 m) board TwistĪ board that is twisted is one of the most frustrating problems to deal with. But, if there are fewer growth rings, or they are of different thicknesses on one side, you will likely receive a bow or crook. Now, the degree of ‘bow’ will depend on how bent, or what angle the board was sawn. So, if the trunk is not perfectly straight (aka – almost every piece of lumber you’ve ever seen). Lumber will bow when there are uneven growth rings on the sides of the boards. This is what can cause a significant amount of bending. These will expand (or contract) more than the growth rings at the top corners or bottom-middle of the end grain. So, the growth rings that are the longest on the end grain will contain the most amount of wood fibers. And the growth rings are not uniform, as they are larger/smaller depending on how much the tree grew each year. Wood will expand and contract based on the growth rings. Also most boards are never perfectly cut in this manner. But, you are unlikely to encounter that in any practical situation, as trees grow different rates each year. However, the movement would be uniform in the thickness of the board, which would be the most forgiving in any project. If the growth rings were uniform thickness, and perpendicular to the width of a board, you would still have movement. More than double the radial change, per the USDA Forestry Service. But, the change tangentially in the growth ring lengths is the most pronounced. While the change radially is more, but not too significant. The change in longitudinal dimension is very small, less than 1% of the overall length. These concepts are illustrated in the image below.
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