Sound absorbing and soundproofing material for acoustic treatment

Sound absorbing and soundproofing material for acoustic treatment

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In this article we will see which sound absorbing material to buy for acoustic treatment, we will also talk about the suitable material for soundproofing. Many building materials that are advertised as having soundproofing characteristics are actually ineffective and only serve to absorb frequencies, only some are effective for soundproofing but often the materials that block the sound do not absorb, so you have to do two different types of treatments to obtain soundproofing and absorption of annoying frequencies. Often many people get confused and think that sound absorbing materials such as pyramidal panels are used to block the sound, nothing more wrong !. Pyramid panels like all other types of porous materials only serve to absorb reflections. Some materials are very effective for soundproofing with test data to prove this, others have only little or no effect at all. Different noise frequencies and different transmission modes require different materials installed. Many acoustic materials can be purchased online, we have created a list of the materials needed to intervene in a room without spending a fortune.

Sound absorption table of sound absorbing materials

1. Rock wool panels – See price or buy

Rock wool can be used either for acoustic correction to remove annoying frequencies or for soundproofing. Its low cost and wide availability make it a great choice for your renovation project. If your intention is to eliminate excess reverberation you can buy rigid rock wool panels by covering them with a cotton fabric, the thicker the panel and the more it will be able to absorb the low frequencies which are the most difficult to remove. . If you want to use rock wool panels to soundproof the room (i.e. prevent external noises from entering or avoid disturbing the neighbors) the procedure is another, you will need to create plasterboard counter walls and false ceilings by filling them internally with these panels.

2. Green soundproofing and sealant glue – See price or buy

Green Glue products are good soundproofing materials. It is an easy to apply sealant used as a sound absorbing material in the construction of soundproof walls. When applied between layers of plasterboard it can dissipate the sound vibrations that pass through the walls and the floor. With this Green Glue you can seal holes, seams and gaps inside walls, ceilings and open spaces such as electrical boxes and screw holes. These open spaces could be a problem if neglected in a soundproofing project, so fill them up to reduce noise loss.

3. Soundproof foam panels – See price or buy

The acoustic sound-absorbing foam regardless of the shape whether it is pyramidal, rusticated or smooth allows you to dampen and absorb unwanted sounds. Absorbent foam panels such as polyurethane are used in recording studios, home theaters and entertainment centers. They are usually placed on the walls in the major points of first reflection. Porous panels like these mainly absorb high frequencies, to have a better absorption it is good to opt for panels with a thickness greater than 5 cm which allow to absorb even the medium frequencies, panels with a thickness greater than 10 cm allow to reduce even low frequencies.

4. Resilient channels, audio clips

Resilient channels are specially designed sheet metal rails that are mounted on the studs of the walls and ceiling joists. These channels allow to gain up to 5 levels of STC if correctly installed in a ceiling or wall. This arrangement may sound strange, but in practice it acts as a kind of acoustic damper. Rather than the sound being transferred through the standard rigid wall assembly, it is absorbed and redirected by the resilient channels.

5. Soundproof drywall

Soundproof drywall consists of multiple layers of drywall and layers of material such as steel to increase its mass and density, thus blocking sound. In this way it is possible to obtain the acoustic insulation of a room or make the walls soundproof.

6. Soundproof curtains – See price or buy

Industrial noise can be reduced by acoustic curtains which are made of quilted fiberglass or rock wool. These curtains are stiffer than traditional ones and hang on frames that make them movable to surround a particularly noisy fixture or area. Beyond soundproofing from noise, acoustic curtains also reduce excessive reverberation as well as improve the aesthetics of a room. An acoustic curtain uses quality, heavy and luxurious fabrics that combine suitable soundproofing materials to dampen sound and reduce echo.

7. Soundproof paint

The soundproof paint can be rolled or sprayed. Paints can only be applied in thin layers creating a thicker coating as the sound insulation allows it to block and absorb sound.

8. Soundproof windows

Soundproof windows are very important to prevent outside noise from entering the room and are equipped with multiple glass panels often separated by one or more layers of air or gas. Soundproof windows are often installed at the top of the existing window via spring loaded frames on rails.

Materials that do not block sound

What about egg crates, foam boards, rugs or mattresses? These materials, while commonly suggested as inexpensive soundproofing solutions, simply don’t work to block out sound. You can avoid spending money on these materials if your goal is to soundproof a room.

Acoustic correction Soundproofing