Nova Zhang
Soundproofing a floor can be done in various ways, depending on the type of flooring and the level of soundproofing required. The subfloor is the foundational layer beneath the flooring surface, and access to it is crucial in determining the soundproofing method. One common approach is to use underlayment, which is installed on top of the subfloor to absorb impact vibrations and block airborne sound. Different types of underlayment include polyethylene foam, acoustic foam, felt, plywood, cement board, and carpet padding. Acoustic underlayment, designed specifically for soundproofing, can be highly effective but costly. Carpeting or rug padding can also help reduce impact noise, but it may not be as effective against airborne noise transmission. For floating hardwood flooring, Impact Barrier® Flooring Underlayment is recommended for its advanced sound-blocking capabilities and moisture resistance. Other options include FloorFighter, an ultra-dense and thin sound barrier membrane, and Quiet Board, which offers excellent insulation and sound dampening.
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What You'll Learn
Acoustic underlayment
Soundproofing a floor typically involves adding a layer of material that absorbs sound and dampens vibrations. This process is known as installing an acoustic underlayment. Acoustic underlayments are effective in reducing noise and improving sound quality in any space.
The first step in soundproofing a floor is to determine whether you have access to the subfloor, which is the foundational layer beneath the flooring surface. If you have access to the subfloor, you can install an acoustic underlayment directly over it before installing the new flooring.
There are various types of acoustic underlayment materials available, each with its own advantages:
- Polyethylene foam and acoustic foam are effective in absorbing impact vibrations and blocking airborne sound. Closed-cell polyethylene foam, in particular, offers superior soundproofing capabilities, with higher density foam providing better performance.
- Plywood is a moderately effective sound blocker and is often used under thin, flexible flooring materials like vinyl or linoleum tiles. Red rosin or tar paper is sometimes added on top of plywood to minimise squeaks, but this does not provide additional soundproofing.
- Carpet or rug padding is another option for acoustic underlayment. Thick pads can be placed under carpets to absorb sound and soften the impact noise from footsteps. Broadloom carpet, for example, has a Noise Reduction Coefficient (NRC) rating of 0.35, absorbing 35% of incoming sound.
- For floating hardwood flooring, Impact Barrier® Flooring Underlayment is the most effective soundproofing material. It reduces impact noise transmission and echoing within a room, while also providing a moisture barrier.
- Quiet Board is a cutting-edge product that insulates and dampens sound while also providing joint support. It is particularly suitable for use under vinyl plank flooring.
- Iso-Step® Floor Underlayment is a rubber underlayment that can be installed under various types of flooring, including ceramic tile, stone, hardwood, laminate, and carpet. It provides superior impact sound insulation and is engineered to perform better than other sound control materials.
It is important to note that while acoustic underlayment can significantly reduce sound transmission, it may not completely eliminate all noise. Additionally, some flooring products, such as CoreTec LVP, do not recommend additional underlayment as it may void the warranty. Always refer to the manual of the flooring product for specific instructions and recommendations.
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Carpet or rug padding
Carpet padding can be more effective at reducing sound than carpeting alone. Broadloom carpet, for example, has an NRC rating of 0.35, absorbing 35% of sound. Carpet plus padding has an NRC rating twice that of carpeting alone.
There are a variety of materials that can be used for carpet or rug padding. Polyethylene foam, acoustic foam, felt, plywood, cement board, and carpeting can all be used as underlayment to dampen noise levels. One user on Reddit recommends Quiet Board as a cutting-edge product that insulates and dampens sound well. Another user recommends a 5/8" thick rug pad to muffle noise.
However, it is important to note that adding a thin layer of insulating material will not completely eliminate sound. For true soundproofing, structural changes may be needed to separate the surfaces and prevent the transmission of vibrations.
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Polyethylene foam
The thickness of the polyethylene foam underlayment can vary, but even a thin layer of 2 mm can provide some sound insulation. This type of underlayment is easily obtainable at most home centers and comes in various brand names. For example, SimpleSolutions Soundbloc is one brand that offers a 2 mm thick polyethylene foam underlayment.
It is important to note that while polyethylene foam can help reduce noise, it may not completely block it. To truly block sound, you would need to separate the surfaces and use a combination of soundproofing techniques and materials. However, polyethylene foam underlayment is a cost-effective and simple way to help reduce noise levels and create a more peaceful environment.
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Felt underlayment
The premium felt underlayment is 3 mm thick and comes with a built-in vapour barrier, protecting your hardwood or laminate flooring from moisture. It is made from recycled fibres that are compressed using a high-heat manufacturing process to create the roll.
To install the premium felt underlayment, the room, underlayment, flooring materials, and adhesives must be maintained at 65 to 85 degrees Fahrenheit, with relative humidity below 60%, for 48 hours prior to, during, and after installation. This ensures optimal conditions for the installation process and helps to achieve the best results.
While felt underlayment offers sound reduction benefits, it is important to note that it may not completely eliminate all noise. Combining felt underlayment with other soundproofing measures, such as carpeting or acoustic foam, can further enhance the sound reduction qualities of your space.
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Soundproof ceiling
Soundproofing a ceiling can be a difficult and costly process, and it may be more effective to soundproof the source of the noise, such as the floor of the room above. However, if you are set on soundproofing your ceiling, there are a few options to consider.
Firstly, you will need to check the construction of the existing ceiling. Most properties have timber joist ceilings, but purpose-built flats usually have concrete ceilings. Concrete ceilings are generally better at reducing airborne sounds due to their higher mass level. To soundproof a timber joist ceiling, you can add mass using acoustic insulation between the joists or soundproof ceiling panels.
One way to soundproof a ceiling is to use a soundproofing system such as isoTRAX®, which combines several soundproofing strategies in one package. This system includes sound isolation rails that separate the drywall from the studs in your assembly, as well as visco elastic sound-deadening pads that help eliminate vibrational noise and further reduce sound transmission.
Another option is to use acoustic insulation slabs, soundproof ceiling panels, and isolation clips to increase the ceiling's sound absorption capability and block both airborne and vibration noise. This method requires removing the existing ceiling and infilling the exposed ceiling cavity with acoustic insulation slabs between the joists.
Additionally, wall-to-wall carpeting with dense padding can also help with soundproofing. The thicker and denser the carpet and padding, the better the soundproofing quality.
It is important to note that soundproofing a ceiling may result in a loss of ceiling height, and it may not completely block all types of noise, especially impact noise.
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Frequently asked questions
There are several options for underlayment that can help with sound reduction. For floating hardwood flooring, Impact Barrier Flooring Underlayment is the most effective floor soundproofing material. Quiet Board is another cutting-edge product that insulates and dampens sound well. Other options include polyethylene foam, acoustic foam, felt, plywood, cement board, and carpeting.
Soundproofing floors starts with determining whether you have access to your subfloor. If you do have access, you can install a sound barrier membrane like FloorFighter or a product like SimpleSolutions Soundbloc. If you don't have access to your subfloor, you may need to soundproof your ceiling instead.
Carpeting can help reduce footfall noise, but it is less effective at reducing airborne noise transmission through the floor. However, adding a dense pad underneath the carpet can improve its soundproofing capabilities.
