Elliot Kim
Soundproofing is an important consideration in building design, especially in sensitive structures such as recording studios, where external noise needs to be kept to a minimum. Sound can be transmitted through the air or via structural elements such as floors and walls. Insulation is a critical component of any sound isolation project, but it is most effective against airborne sound. To mitigate structure-borne sound, a combination of techniques is often required, including the use of damping compounds, acoustic wallpaper, soundproofing curtains, carpets, and resilient underlay. The specific methods and materials employed depend on various factors, including the structural composition, the nature of the receiving spaces, and the radiating surface.
| Characteristics | Values |
|---|---|
| Definition of structure-borne sound | Sound carried via the structure of a building |
| Examples | Heavy footsteps from an upstairs neighbour, a slamming door |
| Methods to reduce structure-borne sound | Anti-vibration dampeners, acoustic wallpaper, soundproofing curtains, carpets and padding, resilient underlay, spring ceiling hangers, sound clips, resilient mounts, staggered electrical boxes, acoustic sealant, metal "Hat Channel", solid core doors |
| Insulation and structure-borne sound | Insulation helps reduce structure-borne sound, especially in staggered walls with less structural noise; in conventional walls with direct structural connections, insulation alone may not be sufficient |
| Soundproofing materials | Rockwool, fiberglass, Green Glue, blown fibreglass, Comfortbatt, Safe'n'Sound, elastic liner, cork, rubber, elastic carpet, wood board, sheet rubber, chip board, wood wool cement slab, Kerto Q, rubber pads |
| Factors influencing soundproofing effectiveness | Structural composition, nature and fabrication of receiving spaces, radiating surface, installation, density and mass of material |
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What You'll Learn
Insulation helps reduce airborne noise
Insulation can help reduce airborne noise, which is transmitted through the air and the atmosphere. This includes sounds such as conversations, televisions, radios, barking dogs, aircraft, and vehicles. By absorbing sound, insulation can prevent these noises from travelling through the home and disrupting adjacent rooms.
There are several types of insulation that can be used to reduce airborne noise. One option is to use foam board insulation, which is ideal for exterior walls. However, thicker boards are necessary for effective soundproofing, as thin boards provide minimal noise reduction. Mineral wool insulation is another option that offers effective sound absorption, although it is more expensive. It is highly resistant to damage and provides longer-lasting protection.
Spray foam insulation is also known to be highly effective in reducing airborne noise. It expands completely into every crevice of the interior of a wall, blocking out unwanted sounds. It is ideal for use in attics and wall cavities, creating a solid, hard surface that blocks a broad range of sounds.
Additionally, specific types of insulation are designed for sound attenuation, such as rock wool or fiberglass batts, which can significantly enhance soundproofing in enclosed spaces.
While insulation can help reduce airborne noise, it may not be as effective for structural noise. In conventional walls with direct structural connections, the use of damping compounds like Green Glue may be more effective in reducing the transmission of structure-borne noise.
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Insulation doesn't stop structural noise
The effectiveness of insulation in reducing sound transmission is dependent on the type of wall construction. In staggered walls, insulation can positively impact mid and high-frequency sounds, but its effect is minimal at low frequencies. In conventional walls with direct structural connections, insulation alone is insufficient, and the structure as a whole may continue to vibrate and transmit sound.
To effectively mitigate structure-borne sound, additional measures are necessary. For new constructions, appropriate building design features can be incorporated, such as using an unconnected structure with elastic liners made from materials like felt, cork, rubber, or elastic carpet between the wall and spandrel girder. However, the subject of structure-borne sound is complex, and factors such as structural composition, the nature of receiving spaces, and radiating surfaces must be considered.
In existing buildings, simple fixes include sealing cracks in walls and gaps around windows and doors. While double glazing can provide insulation, it may not significantly contribute to soundproofing. Products like acoustic wallpaper, soundproofing curtains, carpets, and padding can also help absorb and block sound waves, reducing the impact of structural vibrations. For more comprehensive solutions, consulting a specialist acoustic consultant is advisable.
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Soundproofing with damping compounds
Soundproofing is a technique used to impede sound propagation. It can be achieved through various methods, including increasing the distance between the source and receiver, decoupling, using noise barriers, or employing active anti-noise sound generators. One critical aspect of soundproofing is the use of damping compounds, which are effective in reducing structure-borne noise.
Damping compounds, such as Green Glue, are designed to stop the structure from vibrating. They are applied between layers of walls, ceilings, or floors to reduce the transmission of sound waves. These compounds work by converting sound energy into kinetic energy through vibrations and then into a minimal amount of heat through intermolecular friction. This process effectively dampens the sound and prevents it from travelling further.
Damping compounds are particularly useful in reducing resonant vibration, which is common in sheet metal panels or when objects strike a surface. By reducing the resonance, these compounds minimise the duration and intensity of the noise created. Additionally, damping can be applied to address acoustic resonance in the air or mechanical resonance within the room or objects within it.
The effectiveness of damping compounds in soundproofing depends on the density of the material used. If the density is too low, sound waves can pass through, while a very high density can lead to the reflection of sound waves off the material's surface. Therefore, it is essential to select a damping compound with an appropriate density range to achieve optimal soundproofing results.
When choosing a damping compound for soundproofing, it is important to consider the frequency of the sound you want to dampen. Different materials have varying performance characteristics at different frequencies. For example, polyester fibre is highly effective at high frequencies due to its unique blend of heavy density and porosity. On the other hand, resonant absorbers, such as resonant panels, are most effective at low to medium frequencies and are matched to a narrow frequency range.
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Anti-vibration dampeners
One such example is the Vibra Block, a premium, industrial-grade, high-performance sound-deadening material. Vibra Block is constructed from a vibration-dampening polymer and is designed for easy installation on steel panels and enclosures. It is effective in reducing structural and vibration-based noise transmission, making steel sound more like thick rubber when struck.
Another option is to use self-adhesive elastomer pads, which can be cut to size and applied to structures like vehicle floors, doors, and body panels. These pads suppress noise and vibrations, improving the overall experience for passengers or users.
In hydraulic systems, Hänchen offers a hydraulic silencer, also known as a vibration damper and structure-borne sound absorber. This product channels the pulsating oil flow from the pump, splitting it into multiple partial flows that cause turbulence. This multiple reflection smoothes the total oil flow, reducing the amplitude of the vibration and resulting in a low-pulsation oil flow.
For those seeking to reduce structural-borne sound in their homes, insulation can help to a certain degree. Specifically, sound attenuation insulation has proven effective in reducing sound transmission. Additionally, staggered electrical boxes, acoustic sealant, and denser materials like fire-rated plaster can help limit airborne and structure-borne noise.
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Soundproofing curtains
Insulation can be a valuable part of any soundproofing project, but it is most effective at reducing airborne noise. For example, insulation can be effective at reducing the sound of music coming from the next room. However, insulation is less effective at reducing structure-borne noise, such as the sound of footsteps from upstairs.
While soundproofing curtains can be effective at reducing some noise, they will not completely eliminate outside noise. The best sound-blocking curtains still perform poorer than glass or drywall. Soundproofing curtains typically consist of multiple layers of fabric sandwiched between layers of flexible mass. It's important to install these curtains without any air gaps to maximize their effectiveness.
In addition to soundproofing curtains, other soundproofing measures can be taken, such as using a damping compound like Green Glue to stop the structure from vibrating and transmitting sound. For example, one person used Green Glue between two plywood sheets to reduce noise transmission between floors. Additionally, choosing the right insulation for soundproofing is important. Rockwool is a popular choice, with higher R-values indicating better sound insulation.
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Frequently asked questions
Structure-borne sound is noise that travels through solids such as wood, concrete and steel, rather than through the air. Examples include heavy footsteps from an upstairs neighbour or a slamming door.
There are several ways to reduce structure-borne sound:
- Use carpets and padding to absorb sound waves
- Install anti-vibration dampeners
- Seal any cracks in the walls or gaps around windows or doors
- Install spring ceiling hangers, sound clips, and resilient mounts
- Use an elastic liner between the wall and spandrel girder, as well as between the frame of the building and the wallboard
Insulation helps to absorb sound that passes through the air, but it has minimal effect on structure-borne noise in conventional walls. However, in staggered walls, insulation can have a positive effect on reducing structure-borne sound.
The best insulation for reducing structure-borne sound will have a high R-value, indicating greater density and mass to absorb and block sound waves. Rockwool Safe'n'Sound and fiberglass batts are examples of insulation designed for soundproofing.
In addition to insulation, the use of acoustic wallpaper, soundproofing curtains, and double-glazing can help to reduce structure-borne sound. For new construction, consult an acoustic consultant to design building features that mitigate structure-borne sound.
