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The thickness of a glass fence varies widely based on its application and whether or not there are any safety requirements, but most fences are between 8 millimeters and 12 millimeters thick. 12-millimeter-thick glass is extremely strong and overkill in most cases, which is why you typically only see it around pools and in skyscrapers.

Corrugated metal is a strong, long-lasting material. A corrugated metal fence will typically last several decades, and the metal panels themselves may last for 40 to 60 years. The main thing you should be concerned about is the fence posts. Wood fence posts will last about five years if you purchase them untreated or about 15 years if you treat them after installation. Keep an eye on your posts and look out for insect damage and rot.

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.

A wobbly fence can be caused by a number of things, though poor installation is the usual culprit. It’s always best to have your fence installed by a professional who can ensure the posts are placed correctly and that the chain links have the correct amount of tension.