Acoustic foam does not block sound!
It is common to hear people saying that they are going to put acoustic foam on the ceiling and walls to improve acoustic insulation, to soundproof a room, but no coating, whether foam or wood, has the function of soundproofing, but rather sound absorption. They are materials made to improve the sound internally, reducing sound reflections. Don't confuse!
If you have any questions, send your question here in the comments and we'll answer!
00:00 Introduction
00:09 Foam is not for soundproofing!
— To obtain a soundproof room, mass is needed, that is, heavy and well-sealed materials, such as drywall, acoustic doors and acoustic windows. The foam serves to reduce the echo of an environment, making it more soundly pleasing, whether for a meeting room, a studio or a cinema. It is true that when we put the foam on, the sound level decreases a little, as there are no more sound reflections, but this results in a very small difference in the noise that enters/leaves the environment, compared to soundproofing products such as a acoustic door, for example.
01:08 Example
— Think of the following example: you are in a car in the middle of traffic jam, with that very familiar noise, when you close the windows the noise decreases a lot, but if you open the windows and put foam on the windows you will continue to hear the traffic noise, that's because foam can't insulate a noise because it's not heavy, like glass.
01:43 What to use?
— Drywall on the ceiling and walls, acoustic windows and acoustic doors. These are products made for acoustic insulation, to soundproof a room, they are not simple windows or simple drywall.
And styrofoam, is it good? Not really, Styrofoam is not good for sound insulation, as it is light like foam, and it is also not good for absorption, because it is non-porous, it is hard and reflects a lot of noise instead of absorbing. Styrofoam is only good for thermal insulation! We talk about it in this video: • Por Que Isopor Não Elimina Barulho e o MAT...
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Isolation x Absorption: • ISOLAMENTO x ABSORÇÃO: Entenda a Diferença
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