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Generally speaking, stain is a better option for concrete because it soaks into the surface and won’t get worn away like a topical paint will. Painting concrete increases the risk that moisture will get trapped beneath the top layer of paint, which wears concrete down over time. So long as you know how to prep concrete for staining, you'll maintain its strength after you finish your project.

Tree roots don’t necessarily break through concrete on their own, but they can certainly take advantage of existing cracks, even very small ones. As roots grow, they expand the cracks, making them larger and leading to serious and costly foundation damage. It’s a good idea to have repairs on any foundation cracks you’re concerned about.

Yes, you can pour a concrete slab on dirt, but only if you follow specific requirements. A wooden frame is a must, and the soil layer used for the base must be wet enough, thick enough, and compact enough to support the weight of the concrete slab. Consult with a concrete contractor to ensure you have the base you need.

A 4-inch-thick concrete slab can support around 4,000 pounds per square foot if a contractor reinforces the slab with rebar, while that same slab without reinforcements will support closer to 1,000 pounds. For the purposes of a patio, 4 inches in thickness without reinforcement should suffice unless you’re installing heavy kitchen equipment or a hot tub on it. In those cases, reinforcing your slab and sticking with 4 inches of thickness should provide plenty of strength.