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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.

A properly installed 6-inch concrete slab, mixed and cured under the right conditions, can support about 3,000 pounds concentrated over a single square foot without buckling. Conversely, concrete pavers can handle around 8,000 pounds per square inch when laid over a solid, well-compacted base.

Polished concrete floors also have downsides. Some homeowners, for example, might dislike the coldness of the material (though area rugs can help warm up the space). Concrete floors are also hard, which isn’t always ideal for children and pets. What’s more, these floors are susceptible to cracking, and repairs can be costly. Some homeowners might not like that installation isn’t DIY-friendly. 

Yes, concrete can set in rain, but it’s best if you pour concrete 4 to 8 hours before any rain to ensure it won’t impact its strength and appearance. Exposure to heavy rain during the early stages (the first 48 hours after pouring) can significantly reduce the structural integrity of the concrete. Over time, cracking is more likely due to softer concrete.