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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. 

The best wood for a farm fence is pressure-treated wood that will stand up to various weather conditions, animal contact, and moisture. Farm fences need to resist rot and damage, so choose a species such as cedar or redwood. The natural oils in these woods give them decay resistance, which also makes them ideal for other fence types, such as a wooden snow fence.

A fence gate can sag for several reasons. The issue often stems from the hardware, such as damaged or bent hinges, or loose screws that can no longer support the gate's weight. The gate frame itself might also have come out of square due to failing supports. Alternatively, the problem may not be the gate but the supporting fence post, which could be leaning or out of place. In many cases, fixing a sagging gate is as simple as tightening the hinge screws or upgrading to more robust hinges.

The cost to build a fence is about $3,100 on average, but you could pay anywhere from $400 to $13,700 or more. Your cost will depend on the length, height, and materials for the fence. If you hire a professional installer, labor costs typically represent about half of the total cost of the project. This means you potentially can save quite a bit of money doing the work yourself.