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Fencing questions, answered by experts

You can use pressure-treated wood for a horizontal fence, but you’ll need to purchase a thicker and higher-quality variety to ensure it doesn’t sag or warp after you install it. Use #2 pine grade lumber and boards and thicker dimensional lumber, such as a two-by-six. You’ll also need to use stainless steel or hot-dipped galvanized fasteners, as the chemicals in the treated lumber will cause regular galvanized fasteners to rust. 

A fence post set in concrete lasts anywhere from five to over 25 years, depending on how well the concrete was applied and the fence post’s material. Untreated wood posts in concrete could last less than 10 years, but a durable, treated wood set in properly applied concrete could last a few decades. However, all fence posts will wear out eventually, so expect to need to replace your fence post every five to 15 years.

Most people prefer to keep the fence level by “stepping” the fence when running a horizontal fence over a slope. Stepping involves raising each panel between the posts as the fence moves over changes in slope, giving the fence line the appearance of stair steps. While this may be the preferred method of running a horizontal fence up a slope, there’s nothing wrong with installing your fence so it follows the undulations in the ground instead.

The depth of the fence posts depends on the height of your fence. If you’re installing a 6-foot fence, then digging 2-foot-deep holes for the fence posts will help ensure a secure installation. However, if you’re installing an 8-foot fence, the posts will need to be deeper than 2 feet to support the structure properly. Also, consider how far apart the fence posts should be to provide adequate support.

On most untreated wood fences, there is no need to sand before treating. You typically only need to sand if there’s an old coat of paint or stain on your fence. If you do need to sand off a previous paint or protective coating (like an old stain or sealant), use medium-grit sandpaper.

The Petersburg, IL homeowners’ guide to fencing services

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