Not having to use cross-members does have one caveat: the base of the supports must be solidly bonded to the surface of the slab on which they rest. Bonding the supports guarantees vertical stability during normal use of the raised floor, and ensures perfect positioning during inspections or modification.
The quality of the bonding is fundamental for laying and maintenance, which is why we use adhesives with high adhesion and resistance.
The results of bonding and sealing are clearly described in the British PSA MOB PFPS/SPU regulations, specifically dedicated to raised floors, while European UNI EN 12825 regulations are less exhaustive in the matter: our JVP 4×4 system is certified under both regulations and easily exceeds all requirements.
For more information, a copy of articles T14.00 and T15.00 of the PSA MOB PF PS/SPU standard including the testing diagrams are available in English (with a brief translation of T15.00 in Italian).