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Soundproofing

 

Acoustic insulation aims to reduce the intensity of sounds travelling between the source and the receptor, or simply to hamper noise propagation. Acoustic insulation deals with noise in one of two ways: by blocking or absorbing it. Several factors must be considered when soundproofing issues are tackled, namely resonance, reverberation, reflection and echo levels. Each soundproofing material has characteristics that affect these factors differently. For example, the density, moisture content, weight, composition, or air/matter distribution of the insulation material will have an impact on the frequency of sounds and, automatically, on its propagation.

 

In addition to acoustic materials, a multitude of accessories are available to complete your soundproofing strategy. For example, soundproofing matting and metal profiles fitted between gypsum sheets and wall studs will substantially reduce the propagation of vibrations (caused by sound waves hitting the gypsum) between the two.

 

In the construction industry, products like fiberglass and cellulose are considered, above all else, very efficient thermal insulants. When it comes to sound, however, they are best described as acoustic absorption products, because they capture sound waves as they pass instead of driving them back. There is a unit of measurement for aerial noises (Rw) and an indicator for impact noises (Lw), both of which are expressed in decibels (dB); these units of measure allow us to establish performance levels for each product.

 

A word about acoustic regulation

 

Acoustic regulation (NRA) applies to all new residential buildings or those whose building permits were issued after 1996. It sets minimal insulation requirements, i.e. mandatory decibel levels measured onsite once construction is over.

 

 

The regulation submits single family homes to set insulation levels with regard to exterior aerial noises only (noise from the road, trains, planes, etc.). Inside partitions or floors are not regulated.

 

Semi-detached houses must comply with set insulation levels with regard to road noises as well as aerial noises transmitted from one dwelling to another through the separating walls, façades, and ground. Regulatory constraints are the same as those applicable to apartment buildings.

 

Noise discomfort can actually be alleviated by using various products and techniques. When problems are caused by loud noises, insulation must be coupled with other materials to reduce it to acceptable levels.

 

Tell us about your problem and we will propose the best solution to address it.

 

 

The efficiency of insulation with regard to impact noises is generally evaluated by calculating the difference in dB between the material alone and the material with insulation (Ln); the higher the Lw delta, the better the insulation. The Ln coefficient, representing noise left over after its passage through insulation, is also sometimes calculated: the lower it is, the lower the nuisance and the better the insulation.