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You should put gravel that is 3/4 to 1 inch under a concrete slab. However, depending on the project, local building codes may dictate the proper gravel size and shape. Some concrete slabs that do not hold significant weight may have a subbase of sand. Also, keep in mind that the subbase you choose will affect the cost of your concrete patio, walkway, or driveway.

Yes, it's best to use a carbide-tipped masonry bit when drilling into concrete. These bits are harder and more durable than standard bits, so they're designed for drilling into tough surfaces like concrete. A different bit is likely to break and pose a safety hazard so you'll definitely want to stick with one that's specially designed for concrete. 

Yes, you can put thin pavers over a concrete driveway. However, it's always best to talk to a driveway installer before starting. You'll need to ensure that the concrete below is in good enough shape to hold the pavers and that the driveway will still meet local building codes.

There’s no difference between a “slab foundation” and a “slab-on-grade foundation,” and contractors and homeowners use the terms synonymously. “Slab foundation” is just a shortened version of “slab-on-grade.” In both cases, the homebuilder will pour the concrete foundation into a mold they build directly on the ground. As such, these foundations require no expensive excavation.