The base material for your concrete floor must be level and well compacted.
You MUST have insulation under the concrete floor.
The slab edge MUST be insulated so the concrete floor is not in contact with the foundation or adjacent wall.
The length of each PEX tubing loop should be similar (± 5%) and spaced apart equally. (Use closer spacing next to outside walls.)
If you use reinforcing rod in your concrete floor, the PEX tubing can be placed either beneath it or on top of it. You may tie tubing to the reinforcing rod with either wire or plastic ties available locally.
If you do not use reinforcing rod, use the plastic staples supplied with the package to fasten the tubing to the insulation.
Any floor covering material that you install on top of the concrete will affect the performance of a radiant floor system. (The total R-value of the floor covering that you use should not exceed R-2)
