The ASP Urban Interlock System has been scientifically designed to disseminate load transference through the system to ensure there are zero stress rises and zero deflection within the system. Deflection and stress rises were a great problem for access floors in the 1970’s, 80’s and 90’s due to the basic design and lack of understanding of building movement and design. ASP has designed a proprietary interlock system that is able to take great loads both static and dynamic. This has provided the perfect solution imitating a secondary slab effect that ensures tiles and stone finishes do not crack. The Interlock system provides an interlocked design, which ensures no movement and so eliminates the need for substrates. This elimination of substrates means the Interlock is a cost and time efficient design solution.