Quota Zero AD is a very low thickness underfloor radiant system ideal for renovations, to be installed on any existing flooring or high density insulation support (> 400 kPa). The system consists of RDZ CLIMA pipe in PB Ø 12 mm and a thermoformed sheet in compact polystyrene with a thickness of 1 mm, with self-adhesive bottom and holes inside and between the pits to allow the self-levelling screed to penetrate into the cavities and cling to the substrate.