There are two options for safely heating carpeted floors, one is with a 12mm layer of levelling compound over a 160W/m² heating mat and the other option is our combymat system combined with overlay boards (see picture).
Be aware that the underlay should have a Tog rating no higher than 0.8 Tog, and the carpet no higher than 2.0 Tog. Most hessian-backed carpets have a Tog rating below this. Thermal underfloor insulation boards installed beneath the heating system will increase the heating up time and reduce running costs. Our combymat system must be used with our 6mm Decora insulation layer.