Raised Floor System, Calcium Sulphate Raised Access Floor, Tempered Glass Raised Floor China, Raised Access Flooring Contractors Raised Floor Systems, also known as Access Floors, are an elevated structural floor that is stabilized over a solid substrate, typically a concrete slab. A raised floor system creates a gap ideal for running electrical wiring and HVAC ducts. The material of Calcium Sulphate and Tempered Glass is most common.