Re: Fence Post Rot In Concrete Prevention Help
How I would do it:
- Dig hole deeper than depth of post. Place drain rock (round gravel) in the bottom, bringing it up to the level of the post.
- Insert post into hole, and add a few more inches of drain rock. This will provide a place for trapped water to go -- the bottom of the post should not be sealed in concrete.
- Pour concrete around the post to above the level of finished grade; taper the concrete away from the post down to grade level. This will redirect rainwater away from the post.
Rot requires both moisture and air. That's why posts rot more quickly at ground level than below ground: the moisture from the ground wicks up a little ways to where there's air, but below ground there isn't much air to facilitate to rot.
Even with all that, it won't last forever. As others have suggested, make sure you use PT lumber rated for ground contact. With this type, the treatment has been forced deeper into the wood. Be sure to apply treatment to all cuts and bored holes, as the treatment typically doesn't reach to the core of the wood. This will help prevent rotting from the center.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.