Building acoustics cannot be separated from the use of low-inertia radiant systems. For this reason, RDZ, always attentive to the issues of footfall noise insulation, introduces two important novelties to be combined with its radiant systems: a desolidarising acoustic mat to be placed under the low inertia radiant system called ACU UPL-M, and a second acoustic mat to be placed under the cladding called ACU UT-M. The latter, in the case of undertile installation has a dual advantage: in addition to acoustically insulating the flooring, it drastically reduces the risk of cracking of the covering even in the presence of accidental screed breakage.