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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. 

There are many types of wood fencing that you can choose from. For split rail fencing, the most common wood types are cedar, pine, black locust, and chestnut. The best wood for you will depend on if you like the way a certain wood looks and the availability of the wood type in your area.

Most of the wood types you can find at your local home improvement store are good choices since they all have rot-resistant properties or are pressure-treated with pesticides. If none of the wood options speak to the look you’re going for, check out vinyl fencing.

Posts for a horizontal fence should be no more than 6 feet apart. Wood pickets are not as strong when mounted horizontally as when mounted vertically. As such, the fence panels on a horizontal fence can’t cover the same span between posts as a vertical fence can. If you install the posts further apart on a horizontal fence, the fence will lose stability, making the boards more likely to sag. 

You can use soil and gravel instead of concrete when setting fence posts. However, concrete is more durable and longer lasting, so it's worth considering if you want your fence to withstand the test of time. You should especially consider concrete if you live in a region that experiences severe weather, which can damage your fence.