In AutoCAD Architecture 2022 toolset, a slab object is a three-dimensional (3D) body that is bounded by a planar polygon (perimeter) of any shape, and has multiple edges. A slab is defined by its perimeter, edge conditions, and style. You can use slabs to draw floors and other building model components that require a flat surface and edge conditions.
Roof slabs are similar to slabs in most respects, but are based on distinct roof slab styles. When modeling a roof, you can convert individual faces of the roof into roof slabs, which give you more flexibility in modeling details of the roof’s geometry.