Most basements would be classified as what kind of slab?

The correct classification for most basements is typically "Supported." In the context of basement construction, a supported slab is designed to rest on a foundation or footer. This specialized construction allows for the weight of the building to be adequately supported, taking into account the environmental conditions and any potential moisture issues that can arise from being below ground level.

Supported slabs are designed to provide structural integrity while ensuring that the basement environment remains dry and stable. This configuration is essential for preventing issues such as water accumulation or changes in pressure that could compromise the foundation.

Monolithic slabs generally refer to a single pour of concrete for the floor and footers, which is more common in certain climates and construction types, but this does not usually apply to basements that require below-grade support. Floating slabs are often used in areas with expansive soils or for structures that need some degree of separation from the ground, particularly in crawl spaces rather than fully developed basements. Concrete is a material type rather than a classification of slab.