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Yes, it's typically best to set aluminum fence posts in concrete. You can technically use a mix of gravel and soil instead, but concrete is more stable and secure. Concrete also lasts longer and does a much better job of withstanding the outdoor elements than a gravel or soil mix.

Vinyl fence posts need concrete for longevity and stability. Later on, if a fence post is loose, you may be able to use expandable foam to repair the post. Expandable post foam works well for repairs or temporary fences. But when it comes to initially installing the post, always use concrete for the best results.

There are quite a few differences between concrete and asphalt. Concrete is more costly up front and more challenging to repair. Asphalt does better in cold climates and works well with radiant heat systems. Porous asphalt is also excellent for wet climates, as it allows the water to drain away. However, it does get unpleasantly hot in the summer and requires more maintenance than concrete.

Concrete dries faster in the heat than in the cold, but when concrete cures too fast, it can cause weak concrete. It’s best to pour concrete when temperatures are between 50 and 85 degrees Fahrenheit, watering it five to 10 times per day for seven days (unless you pour concrete in the winter). Slower cure times, such as when pouring concrete in cold weather, can cause strong concrete, but you need to monitor the temperature drop and moisture levels. Avoid pouring concrete when temperatures are below 40 degrees Fahrenheit.