The resolution of the story sounds sometimes can be applied insulation instead of sound insulation, but it does not work every time, or because the sound insulation is a variable that must be considered is the NRC (Noise Reduction Coefficient) and STC (Sound Transmission Class), which is very important to say that it will reduce the sound insulation is about? But for insulation variable to consider is the subject of the Thermal Conductivity and Density are the two principle because this value can be calculated that the heat will be reduced only if you install insulation.
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