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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. 

On most untreated wood fences, there is no need to sand before treating. You typically only need to sand if there’s an old coat of paint or stain on your fence. If you do need to sand off a previous paint or protective coating (like an old stain or sealant), use medium-grit sandpaper.

A setback is an area of space between your fence and the property line, meaning you build a fence a few inches before your neighbor’s property begins. You can build your fence on a setback—some communities recommend this—but this means a sliver of your property will be on your neighbor’s side of your fence.

You can't build a fence against your neighbor's fence if it touches or is attached to it unless you get explicit permission from your neighbor. Most municipalities recommend building a fence about two feet away from your neighbor's fence to allow access for fence repair and mowing.