As regards the acoustic insulation of the façades, the most sensitive element is the windows.
Considering the peculiarities of their constitution (light elements) and the fact that they give rise to discontinuities in the external surroundings of the buildings (forming of joints), the exterior windows and doors represent the weakest building element in terms of sound insulation.
This could theoretically be overcome with a design and constitution of the blind part of the enclosure that would allow to compensate for the lower performance that is admittedly accepted for the exterior windows and doors.
However, in practice, given the ratio of areas and sound insulation (differences greater than 10 dB) between the blind and glazed parts on a façade, reinforcing the insulation of the blind part is not very effective in terms of improvement Of the overall sound insulation of the façade, ie the overall insulation of a wall depends greatly on the insulation of its exterior windows and doors, so the best strategy of raising the sound insulation of a façade is to use solutions with a good insulating power.
The sound insulation level of a window and / or exterior door depends on the following factors: