Why Styrofoam Doesn't Block Noise and the MATERIAL That Works
Many people still think that polystyrene foam is good for acoustics, but that's not quite the case. In this video, we'll explain why polystyrene foam isn't a good acoustic insulator. Below are the topics listed with timestamps; we hope this improves your experience!
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00:00 Introduction
00:20 Polystyrene Foam
— Polystyrene foam is a great material for thermal insulation, but it's not good for acoustic insulation because it's extremely lightweight compared to materials used for insulation like doors, windows, and drywall.
01:00 Polystyrene Foam in Drywall
— To prevent drywall from being empty, it needs to be filled with a material that will prevent noise reflection between the drywall panels. However, polystyrene foam isn't ideal for this absorption situation either; rock wool/PET/glass wool is better.
01:43 Try it out
— There's nothing better than testing the effectiveness of polystyrene foam in acoustics in practice. Open your car windows and place polystyrene foam over the opening. Did you notice the difference? Almost none. This is precisely because polystyrene foam is a lightweight material, with about 10 kg/m³, while glass has at least 200 times the density of polystyrene foam. Even though it is much thinner than polystyrene foam, your car's glass is heavy, with a high density, making it an excellent acoustic insulator.
02:48 Polystyrene foam has its function
— In civil construction or even for thermal insulation, polystyrene foam is excellent, but for acoustic insulation and sound absorption, polystyrene foam is not efficient.
See the difference in our studio before and after acoustic treatment: • ANTES E DEPOIS: Tratamento Acústico em Est...
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