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Have you ever wondered why fence posts get raised up from the ground? Too much concrete! Sometimes "less is more." This happens when the concrete pours out over the grade of the earth. When the ground freezes and moves, it grabs the ring around the top of the hole and begins to push it up. Gravity can't save these posts from mother nature.Another problem we see in contractors pouring cement is the fact that air bubbles can easily escape the human eye. Air bubbles water a nice comfy home to hide up until winter comes. When water freezes, it expands creating little hairline cracks in the dry concrete. These hairline cracks will get bigger and bigger as time goes on eventually compromising the integrity of the post completely.
Contrary to popular belief, it's standard pour the concrete in our hole after properly positioning the post and make sure the concrete is below grade by about 2 inches. A water injection system is best practice and should be designed so all air bubbles are forced upwards out of the cement. This process has been proven and tested since 1984 years without any splitting and cracking.3. Proper fence framing: Common sense would tell you that since a 2x4 is thicker on its side, you should probably build your fence so that the thicker side takes the bulk of the weight. Most fences are built this way but I often see newly constructed fences already looking worn out. Fences could sag for a couple reasons: 1. Having only 2 stringers instead of 3 for a 6 foot fence instead of 3 and 2. Fence stringers should be installed sideways instead of flat. Fence framing should be 3 2x4's on their side attached to each post with properly coated (to prevent deterioration) fence brackets. Something so simple could easily prevent your fence looking like this
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