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SOUNDPROOFING
SOUNDPROOFING
Factors to consider
Noise type: Identify the type of noise you want to block—airborne, impact, or both—to choose the right solution.
Floor height: Installing soundproofing layers can raise the height of your floor, which is a key consideration in rooms with limited headroom.
Final floor finish: Some acoustic solutions are better suited for carpets, while others work with hard flooring like laminate, vinyl, or tile.
DIY skill level: While some options like acoustic mats are relatively simple to install, complex floating floor systems may require a competent DIYer or a professional.
3. Joist Cavity Insulation:
If you have a timber joist floor construction, treating the empty cavity below the floorboards is crucial.
Acoustic Mineral Wool Slabs: Dense mineral wool (like Rockwool Flexi Slabs or Knauf APR) friction-fitted between floor joists. This absorbs sound waves bouncing inside the hollow space, stopping the "drum effect" from amplifying noise.
Isolation Strips: High-mass rubber or foam joist strips applied to the tops of timber joists before floorboards are laid, decoupling the walk surface from the framing.
TYPES OF SOUNDPROOFING FOR FLOORS
Floor soundproofing requires a combination of adding mass to block airborne sound (voices, TV) and creating a cushioning layer to decouple the structure and absorb impact noise (footsteps, dropping items).
The primary types of floor soundproofing materials and systems include:
1. Acoustic Underlays and Mats:
These thin, dense layers are rolled or laid directly over the subfloor before the final floor finish is installed.
Mass-Loaded Vinyl (MLV): High-density, flexible visco-elastic membranes that add sheer weight to the floor to block airborne noise transmission.
Multi-Layer Sound Mats: Multi-layered products (like the SoundMat 3 Plus or Reverso SoundMat) that combine layers of MLV with an internal acoustic closed-cell foam to treat both impact and airborne sounds at the same time.
Rubber Crumb Mats: Ideal for concrete floors, these rolls provide structural separation and dampening, making them excellent beneath ceramic tiles or stone.
2. Floating Floor Systems & Overlay Boards: Instead of being nailed down, these interlocking or tongue-and-groove boards "float" over a resilient layer.
Acoustic Chipboards: High-density moisture-resistant boards (such as Hush-Panel 28) factory-bonded to a resilient felt or foam layer. They add mass and structural separation.
Acoustic Overlay Boards: Slim, heavy timber-based boards (like Maxideck) designed to be laid straight over existing floorboards to offer maximum airborne sound reduction.
Soundproofing a floor effectively requires addressing both impact noise (footsteps, dropped objects) and airborne noise (voices, music). Techniques vary depending on the floor type and the level of noise reduction needed.
Foundational principles of soundproofing
All soundproofing methods for floors are based on three core principles:
Adding mass: Increasing the density and mass of the floor makes it harder for sound waves to pass through. Combining materials of different densities can block a wider range of sound frequencies.
Decoupling: Creating a break or separation in the structure prevents vibrations from traveling through the floor. Floating floor systems and acoustic underlays are designed for this purpose.
Absorption: Filling the empty space within a floor's structure with a sound-absorbing material, like acoustic mineral wool, helps dissipate sound energy and prevents resonance.
Soundproofing a timber floor
Timber floors often have a cavity between the joists, which can amplify noise.
Insulate the cavity: Add acoustic mineral wool or rock wool insulation slabs between the floor joists. A density of at least 60 kg/m³ is recommended for effective absorption.
Use acoustic underlay or mats:
Simple overlay: Install a specialist acoustic mat, such as a mass-loaded vinyl (MLV) mat, directly over the existing floorboards. MLV is a thin, dense, and flexible rubber layer that adds significant mass.
Floating floor system: For maximum performance, create a floating floor. This involves laying acoustic boards that contain a resilient layer bonded to high-mass chipboard or MDF. This system decouples the new floor surface from the existing joists.
Seal all gaps: Use acoustic sealant to fill any gaps between floorboards and around the perimeter of the room to prevent airborne noise from leaking through.
Use resilient materials: For a premium solution, consider a resilient ceiling system on the floor below, using resilient bars or clips to decouple the new plasterboard ceiling from the floor joists.
Budget-friendly and simple fixes
For less invasive or more affordable solutions, consider these options:
Thick rugs and carpets: A plush, dense carpet with a quality acoustic underlay is one of the most effective and affordable ways to reduce both impact and airborne noise.
Mass-loaded vinyl (MLV): This can be installed under almost any floor covering and adds significant mass to block sound waves.
Sealant: Filling any cracks and gaps in the subfloor, especially in timber floors, with acoustic sealant can make a noticeable difference for a low cost.
Additional furnishings: A room with more furniture, especially upholstered pieces, will have better acoustics and less echo than an empty one.
Soundproofing a concrete floor
Concrete floors naturally have more mass than timber, so airborne noise is less of an issue. The primary concern is typically impact noise.
Install an acoustic underlay: The easiest and most effective way to reduce impact noise is to add a rubber or foam-based acoustic underlayment directly on top of the concrete.
Use acoustic mats: High-mass acoustic mats can be laid over the concrete before adding a new floor covering.
Build a floating floor: Similar to timber floors, a high-performance floating floor system can be installed over the concrete. This involves laying acoustic floorboards with a resilient layer, which effectively isolates the new flooring from the concrete slab.
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