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The great thing about preventing racking is that it can be done completely through tension. Almost any normal construction material is quite strong in tension. 1/8" plywood should be fine, as would be hardboard, paperboard, etc. You don't even need the whole back, going from corner-to-corner diagonally in both directions is sufficient. Steel cables ...


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Take a look at how backs are used to stiffen flat-pack furniture. It's often nominally 1/8th in. (usually) paperboard, as it only has to hold the fasteners to the back and resist those fasteners wallowing out. Of course, enough racking force over time can work fasteners out, or wallow out the holes. You'll notice that flat-pack construction also often has ...


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