Isolamento acústico normal, legal ou real: qual adotar?

Abstract

This work focused on the issue of airborn sound insulation to the indoor enclosures regarding acoustic privacy in the context of the acoustic treatment of enclosed spaces. Three types of isolation were displayed, namely real, normal, and legal from the perspective of the notion of level difference, a kind of acoustic trasnmisson loss parameter. The theory reflection applied the noise criteria NC concept contextualized to federal (Brazil), state (Minas Gerais) and municipal (Belo Horizonte) ambits. Regarding the question posed in the title of this paper, here is suggested that the real type acoustic insulation is better to guide the specification of acoustical building insulation system by professional.