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You can use a few different tactics to prevent your deck gate from sagging. Aside from using strong, rot-resistant woods, introducing a diagonal element—such as a tension rod or solid piece of wood to act as a brace—across the gate will offer better support. You can also use rigid joists to prevent the gate from sagging.

Moisture and rot are the largest threat to wooden fences. Stain can help your wood fence last 15 to 20 years, but only if you choose a stain with waterproofing qualities or add a sealant. Oil-based stains create a thicker moisture barrier than water-based stains, though both are mold and mildew resistant. You’ll generally need to re-stain your fence every one to eight years to get full protection.

The most durable metal for a fence is wrought iron. With proper care, a wrought iron fence can last for centuries. This means regular resealing to stave off rust and corrosion, especially in coastal climates with salty sea air. In these environments, chain link and corrugated fencing tend to stand up better to the elements with fewer maintenance needs.

The least expensive farm fence to install is actually a wire fence rather than a cow fence made of lumber. A hog wire fence can be strong, long-lasting, and relatively easy to repair. A woven wire fence also requires less lumber than a wooden fence, reducing the overall cost of your project. However, wire fences tend not to be as aesthetically pleasing as wood fences.