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Choosing the Right Acoustic Underlayment for Your Flooring Project


When it comes to enhancing your living or working space, the importance of acoustic floor underlay cannot be overstated. Not only does it significantly reduce noise transmission between floors, enhancing privacy and comfort, but it also contributes to the overall structural integrity of your flooring. If you’re on the lookout for effective solutions to minimize noise in a building, understanding acoustic floor underlays is crucial.

Acoustic underlays are specialized materials placed beneath the flooring to help dampen sounds, specifically impact noise like footsteps and airborne noises such as voices. These materials can vary greatly in type, thickness, and material, each offering different levels of sound insulation. Using the right acoustic underlay not only creates a quieter environment but also enhances the feel and longevity of your floor by providing additional cushioning and support.

Selecting the appropriate underlay depends on several factors, including the type of flooring you are installing, the level of noise reduction you need, and the specific structural characteristics of your building. Therefore, it is essential to consider your particular requirements and the specifications of the product to ensure optimal performance.

Detailed infographic on how to select the right acoustic underlay, showing different material types, their soundproofing ratings, recommended usages, and a step-by-step selection process - acoustic floor underlay infographic infographic-line-3-steps

What is Acoustic Floor Underlay?

Acoustic floor underlay is a specialized material placed between the floor covering and the subfloor. Its main purpose is to minimize noise transmission within a building. This includes both impact noise and airborne sound, making environments quieter and more comfortable.


The primary purpose of acoustic floor underlay is to enhance living or working spaces by significantly reducing noise levels. It acts as a barrier that absorbs and dissipates sound before it can travel through the building structure. This is particularly important in multi-story buildings, where foot traffic, moving furniture, and other everyday activities can easily disturb occupants on different levels.

Impact Noise

Impact noise, or structure-borne noise, occurs when objects come into direct contact with the floor, such as footsteps, dropped items, or furniture being moved. This type of noise can be especially disruptive and is efficiently mitigated by acoustic underlays. The underlay absorbs the energy from these impacts, preventing the sound from resonating through the concrete or wooden subfloors.

Airborne Sound

Airborne sound involves noise that travels through the air, like voices, music, or TV audio. Acoustic underlays can also help reduce the transmission of these sounds. Although they are primarily designed for impact noise, their density and material composition allow them to also dampen airborne noise to some extent, contributing to a quieter and more serene environment.

By integrating an acoustic underlay into your flooring setup, you not only enhance the comfort of occupants but also add value to your property by adhering to soundproofing standards and regulations that may be in place in certain residential or commercial areas. This makes acoustic underlays an essential consideration in modern architectural and interior design.

Let’s move on to explore the different types of materials used in acoustic underlays and how they cater to varying soundproofing needs.

Types of Acoustic Floor Underlay

When selecting the right acoustic floor underlay, understanding the different types available and their specific properties is crucial. These materials vary in thickness, density, flexibility, and compression, impacting their soundproofing effectiveness and suitability for different flooring types.

Regupol Sonus Series

The Regupol Sonus Series offers two notable products: the Regupol Sonus 4515 Multi 3mm and the Regupol Sonus 4515 Multi 4.5mm. These underlays are designed for versatility and high performance in sound reduction.

  • Materials: Made from a blend of rubber materials, these underlays are both durable and effective in dampening sound vibrations.
  • Thickness: Available in 3mm and 4.5mm options, allowing flexibility based on the level of sound insulation needed.
  • Density: High density contributes to better sound absorption and impact noise reduction.
  • Flexibility: These underlays are flexible enough to fit various floor contours, making installation easier.
  • Compression: They withstand heavy loads without compromising their structural integrity or soundproofing capabilities.

Iso-Step® Soundproofing Underlayment

Iso-Step® is crafted in the USA and stands out for its use of recycled rubber, aligning with environmental sustainability efforts while providing excellent soundproofing.

  • Materials: Predominantly made from recycled rubber, making it an eco-friendly choice.
  • Thickness: Available in multiple thicknesses including 2 mm, 5 mm, 6 mm, 10 mm, and 12 mm, catering to different soundproofing requirements.
  • Density: The high density of the rubber material enhances its ability to absorb and block sound.
  • Flexibility: Rubber’s natural flexibility allows for easy installation under various flooring types.
  • Compression: The material’s compression properties ensure that it maintains effectiveness under long-term use and heavy furniture.

Impact Barrier QT™

Produced by Soundproof Cow, the Impact Barrier QT™ series is known for its environmental safety and exceptional noise reduction capabilities.

  • Materials: Utilizes a unique mass-loaded vinyl that is both effective at sound reduction and safe for indoor environments.
  • Thickness: Offers a substantial barrier without being overly thick, making it suitable for use under most flooring types without significant alterations.
  • Density: The high-density vinyl effectively blocks airborne noise and reduces impact sound transmission.
  • Flexibility: While slightly less flexible than rubber options, it can still be adapted to fit various floor layouts.
  • Compression: Designed to resist compression, ensuring long-lasting performance without degradation.

Each of these products brings something unique to the table in terms of environmental impact, installation ease, and soundproofing effectiveness. Whether you are dealing with heavy impact noise or seeking a greener option, there is an acoustic floor underlay designed to meet those specific needs. Moving forward, let’s delve into the best practices for installing these underlays to maximize their soundproofing efficiency.

Best Practices for Installing Acoustic Floor Underlay

Proper installation of acoustic floor underlay is crucial to ensure it performs its soundproofing function effectively. Here are some general and specific guidelines tailored to different types of flooring.

Installation Techniques

  • Glued: This method involves using an adhesive to secure the underlay directly to the subfloor. It’s ideal for areas with heavy foot traffic as it prevents the underlay from moving. Ensure the floor is clean and dry before application.

  • Floating: Typically used with laminate and engineered wood, floating installation involves laying the underlay without attaching it to the subfloor. This allows the floor to expand and contract naturally.

  • Loose Laid: In temporary setups or where minimal installation impact is preferred, the underlay can simply be laid down without any adhesive. This method is not recommended for high-traffic areas.

Specific Installation Advice for Different Floor Types

  • Hardwood: Use a floating or glued method for hardwood. Ensure the underlay is smooth and flat to avoid any imprinting onto the hardwood over time due to foot traffic or furniture weight.

  • Laminate: Floating is the most common installation technique for laminate floors. The underlay should be capable of handling the expansion and contraction of laminate, especially in varying humidity levels.

  • Vinyl: Glued installation is often preferred for vinyl to prevent the underlay from shifting, which can cause the vinyl to buckle or gap. Choose a high-density underlay to support the flexible nature of vinyl.

  • Carpet: Typically, a denser underlay is used with carpet to ensure comfort and durability. The underlay is generally loose laid, then the carpet is stretched and tacked over it.

For each type of flooring, it’s important to consider the thickness and material of the underlay to ensure compatibility. For instance, thicker underlays might be ideal for reducing noise in high-rise apartments but could be too bulky for use under thin vinyl flooring. Always consult with the flooring manufacturer’s recommendations to ensure the underlay will not void any warranties and will perform as expected.

By following these best practices, you can enhance the longevity and effectiveness of your flooring project, ensuring a quieter and more comfortable environment. Moving forward, let’s compare different acoustic floor underlay products to see which ones offer the best performance, sustainability, and cost-effectiveness.

Comparing Acoustic Floor Underlay Products

Top Picks for Various Flooring Needs

When selecting an acoustic floor underlay, it’s crucial to consider three main factors: performance, sustainability, and cost-effectiveness. Here, we delve into some of the top products in the market and how they stack up in these areas.

1. QA TimberTech2 Gold – This product is renowned for its excellent acoustic properties, particularly in reducing impact noise. It’s a high-performance option suitable for a variety of flooring types including hardwood and laminate. Its dense composition helps to dampen sounds effectively, making it a go-to for those in multi-level living spaces.
2. Autins Group DecibeX – Designed with advanced technology, this underlay excels at minimizing both airborne and impact sound transmission. It’s particularly effective in environments where superior sound control is necessary, such as recording studios and apartments.

1. QA QuickTherm Vapour – This underlay not only provides excellent thermal insulation but is also made from sustainable materials. It contributes to a greener building practice by reducing the carbon footprint associated with its production and disposal.
2. Autins Group DecibeX – The materials used in this product are recyclable, aligning with modern environmental standards. It supports sustainable construction practices without compromising on acoustic performance.

1. QA TimberTech2 Gold – While this underlay is a bit pricier, its durability and multipurpose functionality make it a cost-effective choice in the long run. It protects the flooring, extending its life and reducing the need for frequent replacements.
2. QA QuickTherm Vapour – This product is not only effective at soundproofing but also enhances the thermal efficiency of the flooring. This dual function can lead to cost savings on energy bills, making it an economically sensible option.

Each of these products offers unique benefits, and the best choice will depend on the specific needs of your flooring project. Whether you prioritize cutting-edge sound reduction, environmental impact, or budget-friendly solutions, there’s an underlay that fits the bill. By considering these top picks, you can make an informed decision that ensures both comfort and sustainability in your living or work space.

Frequently Asked Questions about Acoustic Floor Underlay

Which Underlay is Best for Soundproofing?

When it comes to soundproofing, not all underlays are created equal. The Regupol Sonus series and QA PowerWalk Gold are standout choices. Regupol Sonus is designed specifically for superior sound reduction, making it ideal for high-traffic areas and multi-level buildings. QA PowerWalk Gold, on the other hand, combines robust soundproofing with durability, perfect for areas where floor longevity and noise reduction are paramount.

How Do I Reduce Footstep Noise From Upstairs?

To minimize the annoyance of footstep noise from upstairs, consider a combination of solutions:
Carpet Padding: Adding dense carpet padding can significantly absorb footstep impacts.
Underlayment: Installing a high-quality acoustic underlay like Impact Barrier QT™ beneath the flooring can drastically reduce noise transfer.
Acoustic Panels: For those without access to modify the floor above, installing acoustic panels on the ceiling below can help dampen sound transmission.

These methods address both the creation and transmission of sound, providing a quieter environment.

Is Acoustic Underlay Better Than Normal Underlay?

Yes, acoustic underlay generally offers superior performance in noise reduction compared to normal underlays. Here’s why:
Acoustic Properties: Acoustic underlays are specifically engineered to block or absorb sound, especially in terms of impact noise and airborne sound. Products like Impact Barrier QT™ are designed to meet stringent soundproofing standards.
Materials: Acoustic underlays often use materials such as PU foam or recycled rubber, which provide better sound insulation than the materials typically used in standard underlays.
Wool Felt: Some acoustic underlays incorporate wool felt, which not only adds an extra layer of sound absorption but also contributes to thermal insulation.

By choosing an acoustic underlay, you’re investing in a product that’s purpose-built to enhance the sound quality and comfort of your space. Whether you’re dealing with noisy neighbors or simply want to create a quieter home environment, acoustic underlay can provide a significant improvement over traditional options.


When it comes to enhancing the acoustics of your space, choosing the right acoustic floor underlay is crucial. At Rubcorp, we understand the importance of creating environments that are not only functional but also comfortable and serene. Our range of acoustic rubber flooring solutions is designed to meet the diverse needs of commercial and residential projects, ensuring superior soundproofing performance and durability.

Choosing the Right Product

Selecting the appropriate acoustic underlay involves considering several factors, including the type of flooring, the level of noise reduction required, and specific environmental conditions. Here’s how you can ensure you choose the right product for your needs:

  • Assess the environment: Determine the usual noise levels and the sources of noise in the area. This will help you understand the extent of soundproofing needed.
  • Consider the flooring type: Different types of flooring will benefit from specific underlays. For instance, hardwood might require a denser underlay to reduce the sound of footsteps, whereas carpet might need a less dense but thicker underlay for optimal performance.
  • Look for sustainability: Opt for underlays made from recycled materials, like our Impact Barrier QT™, which not only offers excellent noise reduction but also helps in reducing your environmental footprint.


At Rubcorp, we are committed to providing top-notch acoustic solutions that enhance the quality of your living and working environments. Our products are engineered with precision, using materials that are both effective in sound reduction and environmentally friendly. We offer a variety of acoustic underlays that cater to different needs and budgets, ensuring that every project achieves the best possible outcome in terms of sound control and overall comfort.

We invite you to explore our extensive range of products and find the perfect solution for your flooring project. For more information and to view our complete lineup, please visit our acoustic rubber flooring page.

By choosing Rubcorp, you’re not just purchasing a product; you’re investing in a quieter, more peaceful environment. Whether you’re upgrading an office space, constructing a new home, or renovating a studio, our acoustic floor underlay will provide the foundation for a soundproof, serene, and sustainable space.

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Creative Director, Rubcorp Distribution, LLC

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