| Abstract | Several recent NRC studies have investigated the change of sound insulation of lightweight framed floors, due to the addition of floor treatments (toppings and coverings). In this paper, a method to classify floor treatments as globally reacting or locally reacting is presented. A floor treatment that is locally reacting affects only the injected power and not the propagation of structure-borne sound to and through a junction. In this case, the floor treatment affects direct and all flanking sound transmission paths the same, for all path directions. A globally reacting floor treatment affects sound transmission in different paths differently, since it alters both the power injected, and the path itself. In this study lightweight wood frame floors were considered, where for globally reacting floor treatments, orientation of the floor treatment relative to the joists orientation are important parameters for their effectiveness. Several floor treatments (two toppings and six coverings) were measured and classified as locally or globally reacting, and effects are compared. Most of the floor treatments improved sound insulation, but two worsened it. |
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