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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. 

Yes, including sustainable mixes and reflective surfaces to reduce heat absorption.

A floating slab is a single chunk of concrete that sits directly on flat soil, while a monolithic slab is a single piece of concrete that includes built-in footings that reach several feet below where the majority of the slab sits. Monolithic slabs provide more support, so they’re suitable for home construction, whereas floating slabs get minimal support from the soil directly below and are more common under sheds and detached garages.

The number of concrete bags you'll need depends on the width and length of your fence post hole. A 50-pound bag makes about 0.375 cubic feet of concrete. So, if your hole is 30 inches deep and 12 inches wide, you'll probably need around five 50-pound bags for each post.