Raised Floors typically need to be able to create a void as this is their primary purpose. Raised Access Flooring Systems can go to 50 mm system height and with sufficient bracing to 2 meters or more although this is not common. Typical heights and their application are below. Offices are typically 100 mm to 250 mm raised floor system height.  Computer room access flooring typically have 250 mm to 900 mm raised floor system height.