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dwender

01:45PM | 05/11/03
Member Since: 05/10/03
2 lifetime posts
Bvbasement
Should treated lumber and concrete be used together in post foundations, or would something like gravel work better?

treebeard

02:49PM | 05/11/03
Member Since: 01/14/03
265 lifetime posts
It depends on just how you want to use them together. What are your plans?

dwender

12:45PM | 05/13/03
Member Since: 05/10/03
2 lifetime posts
I wanted to use treated 2x4's as a frame for a trellis in my yard. I was going to sink the lumber in cement as an anchor, but heard that you shouldn't because the cement will hold moisture against the wood and promote rot. Is this true? Is there a better way?

treebeard

03:07PM | 05/14/03
Member Since: 01/14/03
265 lifetime posts
If your trellis is large enough to require support from an in-ground post, I'd suggest going large than 2x4, if you can. I might sink a 4x4 in the ground and let it project out of the ground high enough to screw or bolt the trellis to it.

Either way, and you'll likely hear arguments to the contrary here, I would not sink the post directly in concrete. I'd back fill the hole with a good free-draining gravel, or a processed stone (we call it crusher run). Both compact solidly, but still allow for water in the ground to drain away from the post, keeping it as dry as it can be in the ground. Treated wood is best for longevity. Concrete can, and will hold the moisture against the wood. Remember that concrete is a porous material, meaning that moisture can pass through it, albeit very slowly. But that slow passing also keeps the concrete wetter longer against the wood.

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