Noise control: how to win the battle

Noise control: how to win the battle

If you live in a noisy neighborhood, your building is particularly noisy or your children like to listen to rock thoroughly in their bedroom, know that there is a whole battery of ways to reduce noise pollution. Focus on what you can do to live more peacefully. It is common to experience noise pollution to the point of suffering from stress. According to a 2006 INSEE Housing Study, 30% of households complain about noise during the day, 17% at night. In two thirds of the cases, it is traffic noise. As for neighborhood noise, it is increasing: 32% of people complain about it, compared to 21% in 2002. However, the soundproofing of housing improves. Indeed, means exist to isolate your house from outside and inside noise. However, this often requires undertaking some insulation work. Before starting, if the noise is really difficult to live with, you can bring in an acoustician who will establish a complete diagnosis of the solutions to be implemented, possibly accompanied by a guarantee of result. There are various certifications and labels such as Cekal, which attests to the acoustic and thermal performance of the glazing, or the Acotherm label, which is awarded to windows offering good acoustic and thermal qualities. Other certifications exist for doors or air intakes, for example.

Insulate yourself from outside noises

- The Windows The technical solutions to combat exterior noise only apply to so-called "heavy" facades, that is to say concrete, stone or brick, and for windows of common dimensions (glass surfaces limited to approximately 1 / 3 of the facade). You can insulate the facade by about 30 dB by installing window seals, provided they are in good condition. You have the choice between: - The foam: easy to apply but not very durable and moderately effective - The hardenable resin: easy to apply and more durable - Metal lip seals, effective but which requires real know-how for installation. If your windows are single glazed, opt for asymmetric double glazing (different glass thicknesses on either side of the air space) of type 10-6-4 which offers high-performance sound insulation (around 35 dB) . But you may need to strengthen the window structure. Another solution: replacing the window with a new window placed on the existing frame. Preferably choose double glazing with reinforced thermal insulation (VIR) to benefit in addition to good thermal insulation. For even more efficient façade insulation, its windows can be replaced by a new window with high performance double glazing of the "acoustic laminated" type and making a perfect seal between the frame and the masonry. Or, we sometimes add a second window 12 cm in front of or behind the first, and fitted with single glazing of at least 6 mm. - Roller shutter boxes External noise can also pass through the shutters. In this case, install silicone gaskets between the cover plate and the ceiling or else absorbent and acoustic insulation inside the boot. You can also strengthen the trunk by adding or replacing wooden or plaster plates. Be aware, however, that by isolating airborne noise, for example, you suddenly risk hearing internal noise in the building (elevator, neighborhood, etc.) that you did not hear before.

Insulate yourself from "air" interior noises (from one room to another)

It is possible to reduce interior noise inside a building. The heavier and airtight a partition is, the more it is a good acoustic insulator. There are simple walls, which are made of a single material (concrete, brick, concrete blocks, plaster tiles, etc.). The double walls, for their part, consist of two independent elements (plasterboard and bricks, for example) separated by an air space in which an absorbent material is placed (generally glass wool or rock wool ). Finally, the complex walls combine a simple wall and an acoustic lining. If the wall is not airtight, it can be substantially insulated with a plaster or cement coating. For more acoustic efficiency, there are laminating complexes to be glued, which are found in specialized stores. But the wall must be straight and in good condition. Another solution: the doubling on a metal frame, or even the masonry counter-partitions (in brick, plaster tiles or aerated concrete) separated from the main structure by an elastomeric strip.

Insulate yourself from internal shock noises

- Floor insulation It reduces the transmission of shock intensity. The first solution is to lay an insulating floor covering: carpet, flexible tile or parquet on floating joists. You can also make a "floating screed" over the concrete screed by placing a few millimeters of mineral wool or acoustic cellular plastic in between. Even more efficient, but much heavier in terms of implementation: the floating slab. It combines thermal and acoustic insulation with a reinforced concrete slab. It is an overload for the floor and the door thresholds need to be raised. - Insulation of ceilings If your neighbor above is noisy and does not want to know anything, you can insulate your ceiling thanks to a suspended ceiling made up of plasterboards screwed on a metal framework. The space between the two is lined with mineral wool. However, this solution only provides partial insulation against impact noise.

Insulate yourself against equipment noise

- The sanitary insulation If you have a metal bathtub, it is possible to cushion the hidden side with visco-elastic adhesive plates. You can also fill the vacuum under the bathtub with mineral wool to reduce the resonance effect. For the fittings, vibrations can come from an anomaly in the hydraulic circuit: elbow at right angles, perpendicular tapping, change of section. If you have to buy a new tap, pay attention to the "Ds" index, which indicates its acoustic performance. The higher the index, the quieter the valve. The toilet flush sometimes makes a lot of noise when filling. Then adjust the water flow and adjust the float. Today there are also acoustic flush valves. - CMV (controlled mechanical ventilation) It can produce noise for several reasons: 1 / The mechanical vibrations of the engine are transmitted by the base or the base of the extractor. It is then necessary to separate the machine from the ground with flexible studs under the supports and insert flexible sleeves between the machine and the pipes. In some cases, it may be necessary to place the CMV on a floating slab resting on a specific insulation. An acoustician can advise you. 2 / The hum of the fan is transmitted by air propagation inside the ducts. It is then necessary to equip the ducts with a silencer placed between the fan and the exhaust vents. 3 / The air vents whistle because the air intake is too fast or the wall where it is inserted is not tight enough. You must then adjust the installation, or wash or change the vents.