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A fence post set in concrete lasts anywhere from five to over 25 years, depending on how well the concrete was applied and the fence post’s material. Untreated wood posts in concrete could last less than 10 years, but a durable, treated wood set in properly applied concrete could last a few decades. However, all fence posts will wear out eventually, so expect to need to replace your fence post every five to 15 years.

If your concrete stains are green in color, it indicates the presence of mold or algae—which you should address right away. If left unattended, mold will spread to other areas throughout the home. However, be careful not to disturb mold on indoor concrete surfaces and work with a local mold remediation specialist for specialized care. Once free from mold and algae, seal your concrete to eliminate pores and gaps.

If you don’t seal a concrete patio, the surface may crack, fade, or stain. While it’s not strictly necessary to seal a concrete patio, doing so can help protect it, extend its lifespan, and enhance its beauty.

There isn't a winner when comparing expanding foam versus concrete for fence posts. Both have benefits and drawbacks, depending on your budget and priorities. Expanding foam may be a better choice if you want a more eco-friendly solution that cures faster. Concrete is more affordable and durable than expanding foam, yet it is harder to work with and takes longer to cure.