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This depends mainly on how well the posts were installed and what type of wood was used to build the gate in the first place. Softwoods have a life expectancy of up to 15 years but can last slightly longer with regular maintenance and waterproofing treatments. By contrast, hardwoods can last up to 30 years with little care, so you may avoid costly replacements by spending a little more upfront.

How long a fence lasts, including a split rail fence, will depend on the material from which it’s made. The average lifespan of a wood fence is about 15 to 20 years. However, split rail fences made out of premium materials, like composite, vinyl, steel, or aluminum, can last for 25 to 30 years or more, especially if you take good care of the material and carry out necessary maintenance.

You can't build a fence against your neighbor's fence if it touches or is attached to it unless you get explicit permission from your neighbor. Most municipalities recommend building a fence about two feet away from your neighbor's fence to allow access for fence repair and mowing.

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.