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22 July 2019

Soundproofing Techniques: Which Method is Right for Your Project?

Resilmount M237R Decoupling

Decoupling

When there is greater contact surface area between two sides of a structure, sound vibrations can easily travel through and be heard on the other side. By reducing the contact surface area, the sound waves travel through fewer pathways and are reduced by the time they reach the other side of the wall or floor.

Decoupling reduces the contact surface area by separating the structure, to allow the sound to vibrate independently from each other, reducing the sound vibration transfer. Using sound isolation clips, resilient channels, double stud or staggered stud framing are different ways to decouple a wall or ceiling.

One of the most effective decoupling techniques is to use sound isolation clips, which are installed between the stud and furring channel, to disconnect the structure and break up the sound before it reaches the next room. Resilmount sound isolation clips are the perfect solution for this technique, as the unique sound cell design in the thermoplastic rubber section of the clip absorbs structure-borne vibrations, due to its strong column design that provides a small percentage of contact surface area with the structure or substrate it is fastened to.

Using this simple soundproofing method proves to be highly effective and inexpensive.

Decoupling with soundproof clips

Figure 1: Decoupling with soundproof clips

Absorption

The Absorption method uses a product or assembly to absorb sound waves rather than reflect them.

Fibreglass insulation uses the absorption method by preventing air particles from vibrating and making echoing sounds through a cavity. The air gets trapped between the fibres and turns into heat whilst absorbing sound.

Fibreglass insulation is effective in absorbing some of this reverberation, but density should be kept to a minimum as it should not be compressed or tightly packed in the cavity.

The value of absorption is increased significantly when the assembly is decoupled.

Figure 2: Absorption through fibreglass insulation

Figure 2: Absorption through fibreglass insulation (photo credit: Soundproofing Company Inc)

Damping

Damping is used to disperse vibration energy before it can build up and radiate as sound.

The interior of a wall or ceiling assembly is one way of damping a wall or ceiling and soundproofing a room. The vibration energy is cut off by providing soft, yet tuned isolation between the source and the structure, thus reducing noise.

Vibration damping is one of the most cost-effective ways to reduce low-frequency structure-borne noise.


Mass

Mass involves making the wall structure as heavy as possible. A heavier partition with greater mass is more difficult to vibrate, while a lightweight partition is easy to vibrate, so adding more layers on either side of the wall and increasing the mass in the assembly will let through fewer sound vibrations.

Adding two layers of 16mm drywall is one of the most common and cheapest solutions for adding mass to a wall.

Increasing mass will help with low, mid, and high-frequency sound transfer and lead to significant gains in sound isolation.

Mass: Adding layers to the wall

Figure 3: Mass: Adding layers to the wall (photo credit: Soundproofing Company Inc)

Taking each of these principles into account when soundproofing a room will help to reduce sound transfer, but for maximum performance in your sound isolation project, it is recommended that these techniques are combined in one assembly.

If you would like more information about soundproofing for your project, contact our specialists at sales@resilmount.com.au

View more information on Studco Building Systems, including contact details.
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