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Old 10-04-11, 01:42 PM   #11
Xringer
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Cement is porous and water will wick into any wood in contact with it.

If you place your 4x4 mailbox post in the ground, it will slowly rot away.
If you put it in cement, it will rot away faster, since water will run down
the post and into the seam, where the wood can soak it up. & rot.

Found some tips at How To Set a Post in Concrete - Learn How at ACME DIY.com

"Setting the Post

The extra six inches in the depth of the hole is for gravel. If a wood post, even treated wood, touches the soil or is completely encased in concrete, it will prematurely rot. Metal posts will rust. Setting the post onto 6" of gravel allows the water to drain away instead of ruining the post. Adding gravel will add a lot of time to the life span of a wooden or metal post. Tamp down the sides and bottom of the hole and then add the gravel."

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