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Fence boards are consistently exposed to tough weather conditions and are often constructed improperly, promoting splitting and warping. Splitting occurs with improper usage of nails for construction. The wood of the fence naturally shrinks and expands, causing the boards to warp.
Just so, how do you straighten a warped fence gate?
Trim the ends of the cables with wire cutters. Tighten the turnbuckle by turning the central nut with a wrench. This will draw the corners together and straighten the gate. If the gate goes out of alignment in the future, you can straighten it by tightening the turnbuckle more.
Moreover, why do fence boards shrink?
Wood naturally responds to weather. It expands during wet seasons, shrinks during dry spells, and when water freezes in the winter it can crack and splinter. This is the main reason why boards warp and lose their original beauty.
To straighten warped wood, I soak in water. Or if you can't submerse them put a wet cloth on the inside of the warp curve, and soak until straight. And, once it is finalized then seal the grain against future water and the wood glue will stay in there and never warp again, stronger than the piece would be originally.