When insulation is positioned under the screed, we are typically operating within the framework of a “designed” solution, whether referring to new construction or renovation. Underscreed insulation is still the most frequently used method of insulating horizontal partitions from impact noise and that the passive acoustic requirements of the Implementing. Underscreed structures are characterized by the thickness of the screed itself.

The concept at the basis of this subdivi- sion arises from the idea of the system itself, which in turn is based on the operating method of an acoustically performing structure. The elastic material, in order to ensure the expected performance, must be chosen according to the loads to which the system is subjected. Consequently, a key discriminating factor will be the type, weight, and thickness of the screed in the structure

Traditional construction indicated heavy partitions as preferable, attributing most of the structure’s soundproofing power to mass. The evolution of building construction, design methods, and solutions available on the market has given large space and value to lightweight walls, which are increasingly used not only in renovations but also in new constructions. In renovations, some acoustic remediation solutions that favor low thickness use coupled plasterboard panels to improve the soundproofing capacity of the walls.

When talking about airborne noise, the slab should also be taken into consideration, which can be an element of transmission of this type of noise. In order to solve the problem of airborne noise transmission through the slab, an acousticbceiling can be used.