Warping Wood in Action – Where Does It Come From? Sometimes, wood doesn’t wait to warp—it happens right before your eyes. In this clip, you can actually see the board twisting as it’s being sawmilled. That’s the internal stress inside the wood being released all at once. Most of the time, these stresses stay hidden until you cut into the board, but when the grain and tension are just right, the movement is immediate. It’s a good reminder that wood is never truly “dead”—it’s always moving, shifti