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A general rule we used in building material sales figures it at 3.5 lbs per board ft. To figure board footage, Multiply Width * thickness * length, divided by 12 for board ft. For Example, a 6x6x16 = 48 Board feet. 48 board feet * 3.5 = 168 lbs. 168 lbs for the entire 6x6x16'. So 168/16 = 10.5 lbs per linear foot of 6x6. Ofcourse, this is only a general rule, and may vary due to the amount of retention (treated chemical forced into the board) and overall moisture of the product. Some of the newer treatments such as MCA treatment weighs significantly less than some of the older Heavy Retention, because it is supposedly a better preservative and therefore less is needed to adequately protect it from the elements.

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Q: How much does a 6x6 treated post weigh per foot?
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