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Deck support post maximum loads

We recommend using 6x6 for deck support posts.  6x6 has about 2.5 times as much surface area as a 4x4. If the 6x6 is above 12' high bracing is required to stabilize bending moments.

Compression strength (wet to dry)
Douglas Fir is 1300-1700 psi (lbs per square inch)
Pine 960 -1200 psi
 

 


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