Warm Tiles Cable Systems provide a quick and easy installation by utilizing two different cable spacing options. In a typical room above a heated area, simply space the cables 3" (7.61 cm) apart. For a room above a unheated area or a concrete slab, alternate the spacing from 3" (7.61 cm) to 1 1/2 " (3.90 cm ). Simply lace the cable in the metal strapping.