Qualitative characteristics and options for arranging noise -insulating materials
To protect himself from the noise that occurs inside the building or structure itself, special materials are used in which the structure helps to weaken or absorb “parasitic” sound vibrations. Similar materials can be soundproofing or sound -absorbing. The most common way to improve the acoustic conditions of the room is to install on the walls and ceiling of suspended metal cassettes, which have a perforated surface and an integrated noise -insulating layer or do not have it.
The noise -insulating layer is often formed by natural light porous substances – vermiculite, pumice, kaolin, slag or artificial materials – polyurethane foam, polyester foam or polystyrene foam. But such materials quite often have low strength and a rather unpresentable appearance. To protect against external influences and improve the decorative properties of the surface, the main soundproof layer shields with perforated metal sheets. The metal itself does not absorb the sound, but being perforated it has excellent acoustic properties – a sound wave that penetrates through the holes, cannot return back and is repeatedly reflected from the inner surface of the metal.