I need to bring the finished floor elevation of an existing elevated concrete slab up by anywhere from 2"-4" for new operating rooms within a hospital. The operating rooms are required to get a specialized epoxy flooring in which the substrate that it is installed over the existing elevated slab must meet several strength, flatness, and level requirements and can't have any cracks at all. The problem I am concerned about is that the new topper will span over an existing control joint between two separate building additions that are not tied together so I am worried about crack propagation through the topper due to differential movement of the two structures. To help mitigate this I was going to install a thin plate only anchored to one side to span the joint with two layers of poly over the entire floor to act as a slip sheet to minimize shrinkage cracks. Has anyone had any experience with a similar installation? If so what kind of concrete topper product would you recommend? The flooring contractor has stated that products like Ardex and other similar leveling compounds will not work. The topper must have a tensile strength greater than 219psi and a compressive strength greater than 4300psi as tested after installation. Any help or suggestions would be greatly appreciated.
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