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The cross-grain bending won't matter. All of the weight will get distributed to the under-side 2x4s in the event of flex on the 2x12, which are more than capable of holding the weight. The front and rear 2x4s will also maintain the spacing between them, so the 2x12 is going to be doing almost no work anyway.
Rapid City Invasion 2009 'Data' reporting in. |
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