Tyler Wynn
Soundproofing between floors can be a challenging task, but it is possible to significantly reduce noise transmission with the right techniques and materials. The key principle behind soundproofing is to break the pathway of sound vibrations by separating the flooring from the ceiling below. This can be achieved through various methods, such as decoupling, adding mass, sealing cracks, and using insulation or acoustic foam panels. Different types of noise, such as airborne noise (voices, TV) and impact noise (footsteps, moving furniture), may require different soundproofing solutions. Common materials used for soundproofing between floors include carpeting, foam underlayment, felt underlayment, mass-loaded vinyl, acoustic underlay mats, plywood, cement board, and insulation fitted between floor joists.
| Characteristics | Values |
|---|---|
| Flooring | Carpet, Vinyl, Laminate, Asphalt-based flooring |
| Insulation | Rockwool, Cellulose, Denim batts, Polyethylene foam, Acoustic foam, Felt, Plywood, Cement board |
| Additional Techniques | Mass-loaded vinyl, Acoustic underlay mats, Floating floors, Resilient channels, Airseal openings, Soundproof underlayments |
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What You'll Learn
Identify noise sources and choose the right insulation type
To identify noise sources, it is important to distinguish between airborne noise and impact noise. Airborne noise refers to sounds such as voices, music, or television, while impact noise includes footsteps, moving furniture, or vibrations from appliances. Once the predominant noise sources are identified, you can choose the most suitable insulation type to address them.
Carpeting is an excellent option for reducing both airborne and impact noise. It adds mass to the floor, which helps to block sound, and its soft surface absorbs vibrations. If you prefer hard flooring, consider adding a rubber pad underneath. This creates a separation between the flooring and the subfloor, reducing the transmission of sound.
Another effective solution is to use underlayment made of materials such as polyethylene foam, acoustic foam, felt, plywood, cement board, or vinyl. These materials are placed between the subfloor and the flooring to dampen noise levels. Plywood, for example, is often used under thin, flexible flooring materials like vinyl or linoleum tiles. Acoustic foam panels can also be applied to absorb and dampen vibrations.
If you're looking for a more comprehensive solution, consider using resilient channels. These are installed between the drywall and the structural frame, allowing the drywall to "float" and reducing sound vibrations. You can also use mass-loaded vinyl (MLV) as a popular and effective way to add mass to the floor and improve sound blocking.
Finally, don't underestimate the impact of small details. Airseal openings like floor/ceiling vent registers, and if you have ducts or piping, keep them out of joist bays and use soft (fabric) anchors. These simple steps can make a significant difference in reducing noise transfer and creating a more peaceful living environment.
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Use mass-loaded vinyl, acoustic underlay mats, or floating floors
When it comes to soundproofing between floors, there are several methods and materials to consider. One effective approach is to use mass-loaded vinyl (MLV), which is a popular choice due to its density and mass. Vinyl flooring is known for its superior sound dampening qualities, and MLV takes it a step further by adding significant mass to the floor, effectively blocking sound transmission.
Another option is to install acoustic underlay mats, which can be placed beneath the flooring to create a separation between the floor and the subfloor. This separation, often referred to as a "dead air zone," significantly reduces the transmission of vibrations and, consequently, sound. Acoustic foam, felt, and plywood are commonly used materials for acoustic underlayments, with some products specifically designed for impact absorption, such as Soundeater.
Floating floors are another effective way to decouple the flooring from the structure, creating a gap that reduces both airborne and impact noise. This method involves installing a floating floor system that sits on sleeper boards, elevating the flooring and disrupting the pathway of sound vibrations.
When deciding on the best approach, it's important to identify the noise sources. Airborne noise, such as voices or TV sounds, and impact noise, like footsteps or moving furniture, require different solutions. For example, carpeting is excellent for reducing impact noise, while mass-loaded vinyl is more effective at blocking airborne noise.
Additionally, consider the importance of soundproofing for your space. Simple foam underlayments can help mitigate the problem, but for more significant results, you may need to explore more complex and costly solutions, such as creating a dedicated soundproofing system or installing floating floors.
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Use resilient channels to isolate drywall from the structural frame
To soundproof between floors, one method is to use resilient channels to isolate drywall from the structural frame. This is a form of decoupling, which helps to break the path of sound vibrations.
Resilient channels are installed between the drywall and the structural frame, allowing the drywall to "float" and reducing sound vibrations. This method can be used in conjunction with other soundproofing techniques, such as adding insulation or using acoustic foam panels.
To install resilient channels, you should first identify the noise sources and choose the appropriate insulation type. For example, carpeting, foam underlayment, and felt underlayment are all good options for impact noise, such as footsteps or moving furniture. Once you have your chosen insulation, you can begin installing the resilient channels.
The process involves removing the ceiling drywall and any furring strips attached to the joists. Fit your chosen insulation snugly between the floor joists to fill the cavity. Then, fasten the resilient channels spaced 24 inches (61 cm) on-centre beneath the floor structure. Install two layers of 1/2 inch (12mm) Type X drywall, screwing it into the channels and overlapping the layers by at least 12 inches (300mm).
Finally, apply acoustic sealant around the entire edge where the wall meets the ceiling, between the two layers of drywall. This will help to further reduce sound transmission.
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Airseal openings and use ducts for HVAC
Air sealing openings and using ducts for HVAC systems are effective methods to reduce noise transmission between floors. Here are some detailed steps to guide you through the process:
Airseal Openings
Air sealing openings such as floor/ceiling vent registers is an essential step in soundproofing between floors. By sealing these openings, you prevent sound from travelling through gaps and crevices, reducing sound transmission. You can use acoustic sealant or caulk to seal these openings, paying particular attention to the edges where the wall meets the ceiling. It is also recommended to minimise ceiling penetrations, such as light cans and octagon boxes, and avoid fixtures on the ceiling, as these can act as acoustic bridges, transmitting sound vibrations.
Use Ducts for HVAC
When it comes to HVAC systems, using ducts can help with sound insulation. Firstly, keep ducts out of joist bays, as ducts can transmit sound between floors. Instead, use flex ducts for your HVAC system, which can help to reduce sound transmission. Additionally, consider the placement of your HVAC system. If possible, separate the HVAC system from the structural frame by using resilient channels or acoustic foam panels to absorb and dampen vibrations. This separation will help to prevent the HVAC system from carrying sound vibrations throughout the building.
Additional Tips
To further enhance the soundproofing between floors, consider the following tips:
- Use insulation in all abutting vertical partitions, not just the floor, and glue and screw drywall to reduce sound transmission.
- When choosing insulation, opt for dense materials such as cellulose, Rockwool, Roxul Safe Sound, or chopped glass. Ensure that the installation is either dense-packed or tight friction fit to break the vibration pathway between floors.
- If you're installing a new ceiling, consider building a drop ceiling by attaching metal studs to the existing ceiling's wood furring strips. Then, insert fibreglass batting between the studs and affix a layer of drywall panels.
- If you have hardwood or tile flooring, consider adding a soundproofing underlayment, such as acoustic foam, felt, or plywood, to dampen noise levels.
Remember, soundproofing between floors can be challenging, and the effectiveness of these measures may vary depending on your specific situation. For best results, combine multiple soundproofing techniques and always use high-quality materials and proper installation methods.
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Use dense materials like plywood or cement board
Dense materials such as plywood or cement board can be used as underlayments beneath flooring to add weight and reduce sound transmission. Plywood is often used under thin, flexible flooring materials like vinyl or linoleum tiles. It is only a moderately effective sound blocker, but it can be combined with other materials such as red rosin paper or tar paper to minimise squeaks.
Plywood underlayment can be elevated using acoustic underlayment systems, which involve placing the plywood on sleeper boards. This creates a dead air zone that significantly reduces the transmission of vibrations from one floor to another.
Cement board can also be used as an underlayment to add weight and block sound. It is important to note that these materials will only dampen noise levels and will not completely block sound transmission. For true soundproofing, a structural separation between the floor and ceiling is required, which can be costly and may involve sacrificing ceiling height.
In addition to plywood and cement board, other dense materials such as vinyl and laminate flooring can also be effective for sound dampening due to their density and mass. Mass-loaded vinyl (MLV) is a popular choice for adding mass to floors and reducing noise transmission.
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Frequently asked questions
Here are some ways to soundproof your floor:
- Use dense materials like plywood or cement board as underlayments.
- Install a floating floor to decouple the floor from the ceiling below and reduce sound transmission.
- Seal any openings or cracks to reduce noise transfer.
- Use mass-loaded vinyl, acoustic underlay mats, or acoustic foam panels.
Materials such as vinyl, laminate flooring, and asphalt-based flooring are ideal for sound dampening due to their density and mass. Other materials that can be used include plywood, cement board, carpeting, acoustic foam, and felt.
Here are some tips to keep in mind when soundproofing between floors:
- Identify the noise sources and choose the appropriate insulation type.
- Use resilient channels to isolate the drywall from the structural frame and reduce sound vibrations.
- If you have not drywalled the ceiling below yet, use heavier drywall and glue and screw it into place.
- Use high-quality drywall glue to prevent shrinking.
- Use a soundproofing underlayment over the subfloor before installing your flooring.
Some inexpensive ways to soundproof between floors include:
- Airseal openings and use flex ducts for HVAC.
- Insulate between the joists with fibreglass or cellulose wool.
- Use a sound-absorbing pad beneath the upstairs flooring.
