In Garage Floor Racks/Mezzanine Floor Racks supported system the floor is place on top of, or between the existing racking. The floor beams hook directly in to the shelving units and also are secure with a locking pin. This results in a secure as well as strong connection between the floorboards and the racking. The floor itself is made of 38 mm thick chipboard floor panels along with a tongue and groove connection, slid together and secured to the floor beams with screws. Again you can choose to use steel gratings should local safety guidelines not allow chipboard floors.