Setting Fence Posts: 3 Mistakes That Kill Longevity
Opinion piece on the top setting mistakes that cause posts to lean or rot within a few years.
Opinion piece. The full step-by-step lives in our Fence Post Installation Guide. This post is about the mistakes I see week after week that turn a "one-weekend project" into a two-month callback.
Mistake #1: Skipping Gravel
Every rotting post I've replaced was set directly on dirt. Six inches of drainage gravel isn't optional in wet climates — it's the difference between a 20-year post and a 6-year post.
Mistake #2: Bracing With One Stake
A single 2×4 stake holds a post plumb until the first breeze. Use two stakes, 90° apart, and check plumb on adjacent faces — not opposite faces.
Mistake #3: Wet-Mixing Fast-Set Concrete
Fast-setting bags are designed to be poured dry into the hole with water added on top. Mix them in a wheelbarrow first and you'll be jamming half-set concrete around the post with a stick. See Concrete Mix for Fence Posts.
My Take on Timing
Set posts on a Friday, hang rails on Sunday. 48 hours is the sweet spot — anything less risks racking, anything more and the sun bakes moisture out of the concrete crown.
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