It has been shown that high-density materials, such as concrete may be used to reflect sound, which can significantly reduce the amount of noise entering the dwelling. The density and thickness of a wall is a fundamental factor in noise-blocking capacity. In general, the higher the required level of soundproofing, the greater the mass that has to be added. In-situ reinforced concrete dwellings are able to improve comfort levels by preventing noise from entering inside. Concrete soundproofing (insulation against airborne noise – STC (Sound Transmission Class) classification is 47-52 dB.

The high density of concrete has the effect of reducing the sound waves coming from outside. In areas with a lot of traffic or close to industrial zones or large transport centres, the advantages of a reinforced concrete dwelling are quite significant. Even inside the dwelling the concrete can reduce the noise from slamming doors, television and the neighbours and has a direct effect on the quality of life inside the dwelling and, in general, reduces the level of family stress. Studies have proven that up to one third less noise passes through a reinforced concrete wall. (CFA) In a traditional system, the multiple mortar joints between the bricks form “sound leaks”, something that does not occur with concrete. Moreover, in-situ reinforced concrete dwellings can be reinforced with additional insulating materials, such as expanded polystyrene or fibre glass, which can be installed on either side of the wall or even inside it.

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