The in-slab heating cable is designed for installation in concrete slabs to provide gentle background warmth in areas where heat is required for long periods. The slower heat-up time and cool-down time of the inslab cable makes it particularly suitable for rooms which are in constant use.

An electric heating element is installed after the reinforcing mesh has been added and prior to the concrete being poured. Warmup's in-slab elements are designed for installation within the concrete slab. The element wire is tied to the reinforcing mesh of the concrete floor prior to it being poured. The elements consist of fixed length earth-screened electric heating cables of large diameter (approximately 6.2mm) with factory-fitted cold tails for connection to supply. The heating wire is encased in a tough insulation, is then covered with metal braiding — providing an electrical earth and added protection. A super tough PVC outer shield then provides further insulation and protection. The result is a super tough element capable of withstanding the rigours of a typical concrete pour. The resistance wires are factory terminated in a waterproof joint assembly to the supply conductor and earth conductor of the cold tails respectively.

Typical design wattage is 150 watts per square metre. The cable spacing can be varied from between 150mm and 300mm depending upon requirements but is typically around 180mm. All installations should be protected by a RCD (Residual Current Device). The site electrician is required on site during the concrete pour to ensure that no damage to the heating elements occurs.