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I had all the windows and the front door changed in order to improve sound efficiency on the street side. Total removal of old frames. When the installers set up the new racks, my wife found an important day between the wall and the frame. The installer assured him that the expansive foam that he was going to put on the silicone seal would ensure the desired sound comfort. After a week I find that the noise is still there, even if it has decreased (40db glazing). There foam and silicone are they adapted?

Expanded polyurethane foam is a very good thermal insulator, but brings nothing in terms of sound insulation. The catching up between the frame (the fixed part of the joinery) and the wall is not done in the rules of the art. This retrofit can have two causes: either an incorrect size, which has led to the installation of windows smaller than the opening, false false to the level of masonry, which leads to irregular voids while around the carpentry.
If the windows have been ordered too small, you must demand their replacement. If the masonry has false footings, the latter must be caught using mortar and plaster, and not using expanded foam. I think you have to go back to the company that did the work for bad workmanship.

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