In allmost every computerroom/datacenter a raised floor is used. Such a floor serves multiple purposes:
Raised floors are available in many flavors. The right choice depends on the design of your computer room/datacenter.
Rule of thumb is to use a raised installation floor if you expect a huge load within your 19” racks. This type is typically used to carry huge loads and will not bend whilst installing heavy server racks, an UPS or air conditioner.
All IT Rooms can assist you in choosing the right raised floor for your server room/datacenter and provide the delivery and installation.