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Wood stockade fences are acceptable where privacy is needed, but are not as durable as chain link. Posts may be cedar or pressure treated pine directly buried, or metal pipe in concrete footings. Fence panels are usually spruce and may either be treated with preservative or left to weather naturally. Secure panels to posts with galvanized metal fasteners. PVC fence systems are an acceptable substitute for wood only where they are not exposed to impact damage. Do not use in situations where such damage is likely to occur. PVC is also subject to ultraviolet light deterioration over long periods of time and will eventually become brittle under prolonged exposure to direct sunlight unless manufactured with a high content of Titanium Dioxide as a UV inhibitor.