1. Construction systems where a foundation slab is laid without a basement either directly on the ground or on insulation directly in contact with the ground.
  2. Steel can be used to provide a sturdy beam and joist subfloor frame, and is often supplied and installed in modular form.
  3. Made from concrete with steel reinforcing, these floor slab are suspended above-ground.
  4. Timber is commonly used for residential floors using beams and joists and can be delivered as floor cassettes and attached to stumps on site.