Buildtec’s Guide to Under Screed Acoustics

 

Expertise in Acoustics: Your Guide to Underscreed Acoustics

 

Ever feel like your upstairs neighbour is tap-dancing on the ceiling? Or maybe you crave a peaceful home office sanctuary, but the constant foot traffic creates an unwanted soundtrack?
Floor noise can be a real buzzkill. The good news: with the right underscreed acoustic product, you can keep those unwanted sounds from traveling through your floors. But choosing the perfect underscreed can feel daunting. There are various factors to consider, like the type of flooring you're installing, the level of soundproofing you need, and the structure of your floor itself.

 

This guide will help you navigate the world of underscreed acoustics. We'll explore the different materials like rubber, cork, and foam, and how their properties affect sound reduction. We will also delve into considerations like budget and sustainability. By the end, you’ll be a master of underscreed knowledge, ready to choose the perfect solution for a quieter and more peaceful space.

 

Key Considerations:

Before diving into specific product features, it's crucial to understand some key considerations. These will help you assess the effectiveness, suitability, and overall value of different underscreed acoustic products for your project.

• Understand metrics like compression resistance, dynamic stiffness, Impact Sound Reduction Improvement (ΔLw) and Thermal Conductively Coefficient to assess product effectiveness.
• Consider the type of flooring, required sound insulation level, and the floor structure for product suitability.
• Evaluate material composition, thickness, and durability of underscreed acoustic products.
•  Check compliance with global standards such as ISO 10140, EN 12354, and EN 13501- 1 for safety and performance.
• Assess installation methods for their influence on performance, efficiency, and cost- effectiveness.

What is Underscreed Acoustic Insulation (Resilient Layer)?

 

Underscreed acoustic insulation, also known as screed insulation, plays a pivotal role in reducing the transmission of airborne and impact sound through the floor structure, thereby enhancing the comfort and quality of the built environment.

The essence of underscreed insulation, also referred to as a resilient layer, lies in its ability to absorb and dampen sound vibrations. These vibrations are primarily caused byfootsteps, dropped objects, and other physical impacts on the floor surface. This decoupling effect is achieved by incorporating a flexible, resilient layer beneath the screed, which is fundamentally a levelled layer of material (usually concrete) poured onto a subfloor or substrate.

Underscreed acoustic insulation materials are typically made up of flexible, resilient substances such as rubber, foam, or fibreglass, which have inherent sound-damping properties. The
thickness, density, and composition of the insulation layer can be adjusted to meet the specific acoustic requirements of the project.

The use of underscreed insulation is often governed by building regulations like Part E (UK) which set out the minimum performance criteria for sound insulation in different types of
buildings. To ensure compliance, it's essential to select the right underscreed acoustic insulation product based on these standards, as well as the specific needs of the project.

Technical Deep Dive: Choosing the Right Underscreed Acoustic Insulation

Now that we understand the basics of underscreed acoustic insulation, let's delve into some technical considerations to help you choose the right product for your project:

Understanding Performance Metrics:

Not all underscreed insulation is created equal. Here are some key metrics to understand how different products perform:

• Compression Resistance: Imagine someone walking across the floor. This puts pressure on the insulation. Compression resistance tells you how well the material can handle this weight without losing its shape. A higher compression resistance ensures the insulation remains effective for a longer lifespan.
• Dynamic Stiffness: Think of a trampoline. A stiff trampoline bounces you high, while a soft one absorbs your jump. Dynamic stiffness works similarly. Lower stiffness means the material absorbs vibrations better, resulting in better soundproofing against things like footsteps.
• Impact Sound Reduction Improvement (ΔLw): This fancy term simply tells you how much quieter the floor will be with the insulation installed. Higher ΔLw values indicate greater reduction in impact noise, making your space more peaceful.
• Thermal Conductivity Coefficient: This metric might seem unrelated to soundproofing, but it’s actually important! Lower thermal conductivity means the material acts as a better
  thermal insulator too. This can contribute to energy efficiency by keeping your space warmer in winter and cooler in summer.

By understanding these metrics, you can compare different underscreed acoustic insulation products and choose one that best meets your needs for soundproofing and thermal performance.

Material Composition

 

Underscreed acoustic materials typically comprise layers of different elements, each contributing to their overall soundproofing functionality. A resilient layer, often made from recycled rubber or polyurethane foam, forms the primary sound insulation component. This layer is designed to absorb and dissipate the energy of sound waves, reducing their transmission through the floor structure.

In addition to the resilient layer, underscreed materials often include a dense mass layer, usually a mineral-loaded sound barrier mat. This layer adds mass to the floor structure, aiding in reducing the transmission of airborne noise. The composition of this layer is critical, with denser materials generally offering better sound insulation properties.

Installation Considerations

 

Even the most effective acoustic material can be compromised by improper installation. Here are key factors to consider during installation to ensure optimal performance:

• Substrate Preparation: A smooth and level surface is crucial. Any imperfections on the subfloor can negatively impact the effectiveness of the insulation layer. Ensure the
  surface is clean, dry, and level before installation.
•  Product Selection: Choose the right underscreed product for the project's specific acoustic requirements. Consider factors like noise levels and desired sound reduction ratings.
• Installation Thickness: Follow the manufacturer's recommended thickness for the underscreed layer to achieve optimal sound insulation.
• Installation Process: Meticulously follow the product-specific installation instructions. Even minor deviations can compromise performance. Isolgomma's underscreed range is designed for ease of installation, minimizing the risk of installer errors.
• Seam Sealing: Properly seal the seams between sheets to prevent sound flanking (leakage). Most common Isolgomma products (Roll, Uproll, Grei, and Upgrei) come with a peel-back tape for faster installation and reduced errors during seam taping.

Compliance and Standards

 

For guaranteed excellence in acoustic performance and safety, underscreed acoustic products must comply with stringent global standards and regulations. These standards ensure the products deliver the required sound insulation, durability, and safety features expected in both residential and commercial environments.
Here’s a look at some of the key certifications to look out for:

• ISO 10140: This international standard focuses on measuring airborne and impact sound insulation. By adhering to ISO 10140, Isolgomma products demonstrate their effectiveness in reducing noise transmission within a building.
• EN 12354: This European standard plays a vital role in determining how underscreed acoustic products contribute to a building's overall sound insulation performance. Isolgomma products are rigorously tested to meet this standard.
• VOC Emissions: Isolgomma prioritizes indoor air quality. Many Isolgomma products are certified VOC-free, ensuring they do not emit harmful substances that could compromiseair quality within a building.

By meeting these rigorous standards, Isolgomma underscores its commitment to providing high- quality, safe, and effective underscreed acoustic solutions.

Key Considerations for Selection/Specification

 

Selecting the right underscreed acoustic product requires careful consideration of several factors: material and composition, thickness in relation to performance, and installation methods. Additionally, the environmental impact of the product, both during production and use, should be evaluated.

Material and Composition

 

Understanding the material and composition of underscreed acoustics is crucial for an informed decision. Different materials offer unique strengths, catering to specific project requirements. Commonly used materials include rubber, cork, and polyurethane foam:

Rubber: Renowned for its exceptional sound insulation properties and durability. High dynamic stiffness translates to superior vibration absorption and impact noise reduction (ΔLw).
Rubber’s closed-cell structure inherently resists moisture, making it suitable for various environments. Isolgomma rubber underscreed products Utilize a specifically formulated high- density recycled rubber compound for optimum sound insulation while maintaining environmental consciousness. Their closed-cell structure ensures moisture resistance.

Cork: Excels in thermal insulation, contributing to energy efficiency. However, its sound insulation capabilities are generally lower than rubber.

Polyurethane foam: Offers flexibility and moisture resistance, making it suitable for damp- prone areas. However, its sound insulation performance is typically lower compared to rubber.

Combinations of materials, like rubber and cork, can provide a balance of sound and thermal insulation. When selecting materials, consider their recyclability and environmental impact to promote sustainability.

Choosing the right products.

 

Quite often, specifiers rely on familiar products from previous builds or opt for the most readily available options. This approach can be risky, as each project presents unique requirements. Selecting the ideal underscreed acoustic material isn't a one-size-fits-all solution. A thorough understanding of the project's specific needs is crucial, including desired sound insulation levels, the existing floor structure, and environmental considerations. By carefully analyzing the strengths and weaknesses of each material, along with specific product  pecifications,
specifiers can make informed decisions that achieve excellent sound insulation and contribute to overall project success.

Thickness and Performance

 

A thicker underscreed product usually means better sound insulation. However, it's not quite that simple. Material composition and structure also play a big role in performance. Thickness affects how well the product absorbs and reduces impact sound, which is important in multi-level buildings to minimize noise transfer. Specific thicknesses are engineered to provide optimal reduction of both airborne and impact sound. It's important to note that thicker  materials are more effective at blocking low-frequency sounds.

Thickness also impacts durability. Thicker underscreed acoustics can handle more weight and stress, which is important for different building uses. But there's a trade-off: excessively thick products can be expensive and cumbersome to install. Finding the right balance between thickness, performance, and cost is key to a successful underscreed acoustic installation.

Installation Methods

The installation method of your underscreed acoustic product significantly impacts performance, efficiency, and cost-effectiveness. There's no one-size-fits-all approach, as installation varies based on product type, application, and site conditions.

Here are key factors to consider for informed decision-making:

• Ease of Installation: Some products, like Isolgomma's roll range (e.g., Roll, Uproll) with peel-back tape, come in user-friendly formats for faster and less error-prone installation,
  reducing labor costs.
• Compatibility with Structure: The chosen product must seamlessly integrate with the existing or planned building structure, including floor type and subfloor conditions.
• Installation Time: Simpler installation methods can significantly reduce labor time and costs. Some Isolgomma products, like roll, uproll, grei etc are that can be applied to the floor whilst rising up the walls, further cut down on installation time, by removing the need of edging strips.
• Future Maintenance: Consider how the installation method might affect future repairs or replacements.
• Post-Installation Performance: The installation process can influence the product’s effectiveness in sound reduction.

By carefully evaluating these factors, you can select an underscreed acoustic product with an installation method that meets your project requirements and maximizes your building’s acoustic
performance.

Environmental Considerations: Choosing a Sustainable Solution

 

Selecting an underscreed acoustic product with a low environmental impact is not just good for the planet, it can also contribute to a project's long-term performance and compliance with green building standards. Here's why rubber stands out as an environmentally friendly choice:

• Durability: High-quality rubber underscreed products, like Isolgomma, boast exceptional durability. This translates to a longer lifespan, reducing the need for replacements and conserving resources over time. Compared to cork, which can degrade over time, and polyurethane foam, which may require more frequent replacement due to wear and tear, rubber offers a more sustainable solution.
• Recyclability: Many rubber underscreed products are recyclable, minimizing waste and contributing to a circular economy. While cork can also be recycled, the availability of recycling facilities for cork can be limited in some regions. Polyurethane foam, on the other hand, is often not recyclable.
• Manufacturing Process: Rubber production can be more energy-efficient compared to some other materials used in underscreed acoustics. Look for manufacturers who prioritize sustainable practices throughout the manufacturing process.

Beyond Rubber:

While rubber excels in these aspects, other factors like embodied carbon and sourcing practices should also be considered for a holistic environmental evaluation. Look for products with certifications like Environmental Product Declarations (EPDs) that provide transparency on these details.

Remember:

The key is to choose a product that balances performance, environmental impact, and responsible manufacturing practices.

Practical Applications

 

Under screed acoustics products find extensive use across various types of projects, be it residential, commercial, or public buildings. These products are critical in both new construction
scenarios and renovation projects, contributing greatly to enhanced sound insulation. It is important to understand the specific demands of each of these diverse applications to select the most suitable underscreed acoustic solution.

Residential Projects

 

The choice of underscreed acoustic products must take into account factors such as:

• The type of finished flooring to be installed: Different products are designed to work optimally with various kinds of floors.
• The required sound insulation level: Certain products offer higher sound reduction ratings than others.
• The floor structure: The structural characteristics of the floor can dictate the compatibility with specific underscreed acoustic products.
• The budget: The cost of these products can vary, so it is important to find a product that provides the best value for money.
• Sustainability: Some products are more eco-friendly than others, a factor that is increasingly important in today's residential projects.

Understanding these factors is essential to determine the most suitable underscreed acoustic product for a residential project, ensuring the best balance between efficiency, cost- effectiveness, and sustainability.

Commercial and Public Buildings

Just as with residential projects, a vast array of underscreed acoustic products are available for commercial and public buildings, each with its unique practical applications tailored to meet varying acoustic requirements, floor structures, and budget constraints. The selection of these products is vital in guaranteeing maximum sound reduction in spaces that typically experience higher levels of noise, such as offices, restaurants, shops, and public transportation hubs.

Products like Point Impact Noise Protection Mats and HighMat Acoustic Floating Floor are commonly used in these settings. The former offers high performance in terms of acoustic insulation and mechanical resistance, making it suitable for commercial buildings where heavy foot traffic is expected. The latter, on the other hand, is ideal for buildings with varying floor heights, as it provides a high level of sound insulation while maintaining a low profile.

Additionally, products like Upgrei Acoustic Insulation and Uproll Acoustic Insulation are designed for high-thickness floating floors and roll-out applications respectively, catering to different installation methods and structural considerations.

The choice of underscreed acoustic product should be guided by the specific needs of the roject, taking into account factors such as noise levels, floor structure, budget, and technical
specifications to ensure the most effective solution is selected.

New Constructions and Renovations

Underscreed acoustics are increasingly being incorporated into both new constructions and renovations due to their well-recognized role in enhancing sound insulation performance. This solution is gaining traction worldwide for its ability to improve acoustic comfort, reduce noise transmission, and create a more peaceful living or working environment.

Here are five key considerations for practical applications in new constructions and renovations:

1. Material Selection: The quality of the underscreed material directly impacts overall acoustic performance. Choose high-density, flexible, and resilient materials for optimal results.
2. Design Compatibility: Ensure the underscreed acoustic system integrates seamlessly with your design, without causing any structural issues.
3. Installer Expertise: Hire experienced professionals who understand the technical aspects of underscreed installation for a successful outcome.
4. Cost-Effectiveness: While quality shouldn't be compromised, consider the overall cost- effectiveness of the product and installation process.
5. Regulatory Compliance: Confirm that the chosen product and installation process comply with all relevant local and international building regulations.

Renovation Applications:

The good news is that renovations don't always require replacing the entire floor. By using the right type of Isolgomma Underscreed and following the correct build-up process, you may be able to meet building regulations for improved sound insulation. This applies to both timber joist systems and concrete floors. Buildtec can assist with design and specification during the renovation stage to ensure a successful outcome.

Screed Insulation Products from Buildtec Acoutics

Buildtec Acoustics is the exclusive distributor for Isolgomma’s high-performance under-screed acoustic insulation products in the UK. These resilient layers are designed for various floor
constructions, including pre-cast concrete, beam and block, in-situ concrete, and CLT timber. They ensure compliance with UK building regulations, including TGD Doc Part E (England and
Wales) and Section 5 (Scotland).

Sustainable, High-Performance Solutions

Isolgomma under-screed acoustic mats are lightweight, easy to install, and environmentally friendly. They exhibit minimal creep under heavy loads, making them ideal for various sub-floors
like sand and cement, proprietary screeds, and self-leveling compounds. Additionally, they are VOC-free, ensuring good indoor air quality.

Isolgomma Under-Screed Products

Buildtec offers a range of Isolgomma under-screed products to suit different needs:

• Roll Under-Screed Acoustic Insulation: This versatile product boasts sustainability, ease of installation, and high performance with minimal creep. It's compatible with various sub-floors and underfloor heating systems. Available in 5mm and 9mm thicknesses, it offers excellent impact sound reduction (22dB), dynamic stiffness, and compressive strength
• Uproll Under-screed Acoustic Insulation: Designed for both residential and commercial applications, Uproll provides superior impact sound insulation (≥ 24 dB) with a 9mm thickness. It’s quick and easy to install, maintains elasticity and durability, and is suitable for underfloor heating.
• Upgrei – Acoustic Insulation for High Thickness Floating Floors: Upgrei caters to heavy-duty floors with its 10mm thickness and high impact sound reduction (up to 26 dB). Made from recycled EPDM rubber granules and polyester fiber, it offers excellent thermal insulation and stability. Additionally, it's easy to install with a self-adhesive border seam.
• Grei – Underscreed Impact Sound Insulation: This eco-friendly and VOC-free solution provides high-performance impact sound insulation (up to 30 dB) in a 7mm thickness. It offers excellent elasticity, long-term performance, and suitability for underfloor heating, floating screeds, and plant rooms.
• Highmat Acoustic Floating Floor: This system delivers superior acoustic insulation (up to 39 dB) for floors with floating screeds. Combining rubber bearing pads and polyester fiber filler in easy-to-install panels, Highmat maintains performance over time and is suitable for high-impact areas and plant rooms. Available in 20mm, 30mm, and 50mm thicknesses, it provides effective noise and vibration isolation.

By choosing Buildtec Acoustics and Isolgomma under-screed products, you can ensure excellent sound insulation, a sustainable solution, and compliance with building regulations.

Conclusion: Building a Quieter Future

Banishing floor noise from your home or workplace doesn't require a construction degree. Choosing the right underscreed acoustic product is your key to creating a peaceful haven.
This guide has equipped you with the knowledge to navigate the world of underscreed acoustics. Now you can make informed decisions to transform your space into a sanctuary of
tranquillity, free from the constant drumbeat of footsteps or outside noises.

Remember, a quieter environment fosters better sleep, improved focus, and a more relaxed atmosphere. By prioritizing soundproofing, you're investing in your well-being and the comfort of those around you.
Feeling overwhelmed? Don't go it alone! Buildtec Acoustics is here to help. We offer a range of high-quality underscreed solutions and expert advice to guide you towards the perfect fit for your project.