Roller Shutters Noise Reduction: Block Noise Effectively

How Do Roller Shutters Block Out Noise? This article unpacks the science, materials, and design behind roller shutters’ noise reduction abilities, offering an expert view on their acoustic effectiveness. Dive into the physics, material specifics, and installation factors that empower roller shutters to serve as formidable barriers against unwanted sound intrusion. For local options and professional installation in Western Australia, see our range of roller shutters in Perth.

Author: James Cameron, Acoustic Engineer and Certified Roller Shutter Installer with 15+ years of experience in residential noise control, façade retrofits, and acoustic product specification.

Fundamentals of Noise Reduction and Sound Transmission

Understanding Sound Waves and Noise Pollution Sources

Sound is a mechanical wave that propagates through air by oscillating particles, characterized by its frequency (measured in Hertz) and amplitude (related to loudness). Noise pollution sources—such as traffic, construction, rail lines, aircraft, and dense urban activity—emit a broad range of sound frequencies from low-frequency rumble (below 250 Hz) to higher-pitched noises exceeding 2,000 Hz. Low-frequency sounds, like heavy road traffic and construction machinery, possess longer wavelengths that are harder to block because they bend around obstacles and can excite building elements. High-frequency noise, including sirens or alarms, has shorter wavelengths and is typically easier to attenuate.

The propagation of sound waves follows acoustic wave propagation principles, whereby waves can be reflected, absorbed, or transmitted depending on the medium. When sound hits a surface, some energy is reflected back, some is converted to heat through damping, and some is transmitted through the assembly. Introducing physical barriers creates a phenomenon called transmission loss—the reduction in sound energy that passes through a material or structure, expressed in decibels (dB). In simple terms, higher transmission loss means less noise gets through. Maximizing transmission loss is central to any effective façade solution, including roller shutters.

Noise control is rarely about one material alone. It is usually the interaction of mass, damping, decoupling, and sealing. Mass law is the broad acoustic principle that says heavier barriers usually block more sound, especially in the mid to high frequencies. But mass alone is not enough. If a barrier can vibrate, it can re-radiate sound on the other side. That is why damping layers, air gaps, and airtight seals are so important: they interrupt the vibration path and reduce the amount of energy reaching the interior.

Another key issue is structural resonance. Every panel, slat, frame, or housing has natural frequencies at which it prefers to vibrate. If outside noise matches those frequencies, the assembly can amplify the sound instead of blocking it. Acoustic design aims to shift those resonances away from common traffic and urban noise bands, then suppress them with damping materials. This is where roller shutters can outperform lighter window treatments when they are properly specified and installed.

Air leakage is often the weakest point in a noise control system. Even a small gap can undermine an otherwise solid barrier because sound energy travels through openings far more easily than through dense material. That is why air gap effects must be considered carefully. A sealed cavity can improve isolation by creating a break in the sound path, but an unsealed cavity can act like a conduit for noise. In practice, acoustic performance depends on acoustic seal integrity across the entire system—slats, guides, end stops, housing, and frame interface.

Acoustical Engineering Principles Relevant to Noise Control

Acoustical engineering addresses noise reduction by using materials and assemblies that absorb, reflect, or dampen sound and vibrations. Mass law is a fundamental principle stating that increasing the mass of a barrier reduces sound transmission, making heavier materials more effective in general. Besides mass, damping plays a crucial role: special layers, like foams or polymers, convert vibrational sound energy into negligible heat, reducing structural vibrations and resonance. This is especially valuable for panels and slats that might otherwise “drum” when struck by wind or traffic noise.

Another relevant concept is vibration isolation. Instead of allowing a shutter box or guide rail to rigidly connect with the building structure, installers can use isolation pads, resilient fixings, or vibration isolation mounts to reduce the transfer of structure-borne noise. This matters because sound does not only arrive through the air; it can also travel through walls, lintels, and frames as vibration. Reducing those rigid paths improves real-world performance beyond what material ratings alone suggest.

The effectiveness of any assembly also depends on air gap effects, where sealed cavities between materials interrupt sound transmission pathways. However, such spaces must be airtight; even small leaks compromise soundproofing. This relates directly to acoustic seal integrity, which is critical to ensure the shutter system blocks sound efficiently. In a roller shutter system, the air space between the shutter curtain and the glazing is often one of the reasons performance improves, provided the system is correctly sealed and not short-circuited by gaps.

For homeowners and installers, the practical takeaway is simple: the best acoustic result comes from combining massive components, damping infills, tight fitment, and low-vibration mounting. A roller shutter that uses all four can offer a noticeable improvement in comfort, particularly where traffic, industrial, or neighborhood noise is affecting sleep and day-to-day living.

Introduction to Sound Transmission Class (STC) and Noise Reduction Rating (NRR)

Two key acoustic performance metrics are Sound Transmission Class (STC)—a rating that describes how well a building assembly blocks airborne sound—and Noise Reduction Rating (NRR)—a decibel-based measure often used for hearing protection and some noise-control products.^[1] STC is the more relevant term for roller shutters because it evaluates a complete assembly rather than just a single material. Higher STC values indicate better sound insulation, with typical building products ranging from around 20 to 60+ depending on construction.

NRR is more common in consumer and occupational noise contexts, but it still helps readers understand attenuation potential. For roller shutters, manufacturers may publish lab-tested acoustic data, and comparing STC, transmission loss curves, and product build quality is more useful than relying on marketing claims alone. In practice, a shutter with superior sealing and foam-filled slats can perform better than a thicker but poorly fitted product.

For readers new to the terminology: transmission loss tells you how much sound is reduced as it passes through a barrier; STC simplifies that into a single comparative number; and NRR expresses reduction in decibels in a more consumer-friendly way. These metrics do not replace real-world assessment, because installation quality, façade geometry, and surrounding noise frequencies can shift results significantly.

This scientific foundation prepares us to explore how different materials and design features enhance roller shutters’ noise-blocking performance. For a broader overview.

Roller Shutter Materials and Their Acoustic Properties

Acoustic Insulation Characteristics of Aluminium Slats

Aluminium is widely used due to its strength, corrosion resistance, and durability. Its density (~2.7 g/cm³) provides mass to reflect and block sound waves effectively, leveraging the mass law principle. Aluminium is especially effective at attenuating higher frequencies and can contribute meaningfully to overall transmission loss, but its rigidity also means it can transmit vibrations if not properly damped. This is why a plain aluminium slat does not automatically equal strong acoustic performance.

To address this, many manufacturers incorporate internal acoustic insulation materials such as foam or polymer infills into hollow aluminium slats. These serve as vibration damping layers that reduce structural resonance and dissipate sound energy, enhancing overall sound blocking. A foam-filled profile works by absorbing vibrational energy inside the slat cavity, making it harder for the shutter to behave like a drum skin when struck by noise or wind-induced oscillation.

Aluminium also offers strong thermal performance when paired with insulated cores, so there is often a useful synergy between thermal insulation and noise control. In hot climates or streets with intense daytime noise, that can be a practical advantage. However, acoustic performance still depends heavily on the thickness of the outer skin, the quality of the internal fill, and whether the edges are sealed tightly enough to preserve the assembly’s acoustic seal integrity.

Noise Blocking Performance of PVC and Composite Materials

PVC (Polyvinyl Chloride) shutters have lower mass (~1.3–1.4 g/cm³) compared to aluminium, meaning they rely less on raw density and more on viscoelastic behavior. That material flexibility can absorb mid- to high-frequency sound through internal friction, helping reduce reverberated noise. In some applications, PVC may feel quieter in operation because it can reduce the “ringing” effect associated with stiffer slats.

The limitation is mass. Lower density usually means less low-frequency blocking, particularly against road rumble, bass-heavy music, or nearby machinery. PVC can still be effective, but the benefit is strongest when the shutter design also includes sealed air cavities, reinforced profiles, and robust perimeter sealing. In other words, the material helps, but the system design matters just as much.

Composite materials combine the strengths of multiple substrates, such as PVC-faced profiles with aluminium reinforcement or multi-layered slat construction. Some designs incorporate foam cores, polymer damping layers, or multi-chamber geometries. These improve the sound blocking mechanism by combining mass, absorption, and air gap effects. They also help stabilize the shutter against environmental stress, which can preserve acoustic performance over time.

From a practical standpoint, composite shutters are often the best “balanced” option for homeowners prioritizing comfort, because they can offer better sound control than basic lightweight products without the full cost or weight of high-density custom systems. For product selection guidance,

Comparative Analysis of Roller Shutter Materials in Soundproofing

Material	Density (g/cm³)	Sound Blocking Mechanism	Advantages	Limitations
Aluminium	~2.7	Mass-based reflection and partial vibration transmission	Durable, high STC potential with insulation layer	High stiffness transmits vibrations without damping
PVC	1.3–1.4	Viscoelastic absorption, limited mass effect	Good mid-high frequency absorption, weather resistant	Lower mass reduces blocking of low frequencies
Composite	Varies (layers)	Combined mass, absorption, and air gap effects	Balanced performance, enhanced damping	More costly, complex manufacturing

When selecting materials, consider acoustic properties alongside durability, thermal performance, and cost. The right product often depends on the dominant noise source. For example, a busy arterial road may favor heavier insulated profiles, while neighborhood and general urban noise may be addressed well by a lighter composite design with excellent sealing.

Explore benefits of energy-efficient roller shutters in Perth for integrated noise and energy solutions, especially where comfort, lower heat gain, and reduced nuisance sound are all priorities.

For homeowners comparing options, it is worth remembering that the best material is not always the heaviest material. A well-sealed composite shutter with foam-filled slats can outperform a heavier but poorly installed aluminium system. That is why material choice should always be considered together with fitment, guide design, and perimeter sealing.

The Science Behind Roller Shutter Design for Noise Insulation

Construction of Roller Shutter Slats and Sound Vibration Damping

Roller shutter slats are hollow profiles designed to balance structural integrity with noise control. Hollow geometries allow incorporation of foam infills or damping polymers that mitigate structural resonance—the tendency of slats to vibrate at specific frequencies. By dissipating sound energy as heat, these infills reduce vibration transmission that causes low-frequency noise to penetrate interiors. This is especially useful where a shutter is exposed to road traffic, wind loading, or nearby machinery that can excite the curtain and housing.

Slat geometry also influences how the shutter behaves acoustically. Overlapping profiles create multiple barriers that force sound to reflect and lose energy before reaching the glazing. If the overlap is shallow or the slats are loose, sound can leak through micro-gaps and the whole system becomes less effective. A tighter interlock, combined with damping infill, helps maintain stable performance over time.

Role of Slat Thickness, Density, and Surface Texture in Noise Reduction

Slat thickness directly influences mass and stiffness, both crucial in improving transmission loss. Thicker, denser slats block more sound by virtue of higher mass law effectiveness. Surface texture also plays a nuanced role: lightly textured or matte finishes scatter sound waves, reducing reflections and destructive resonance, enhancing the acoustic seal integrity at slat overlaps.

Some advanced slats feature micro-perforated treatments or layered coatings that trap sound waves within the shutter profile, further improving absorption. The performance benefit is usually modest compared with mass, damping, and sealing, but it can contribute to smoother acoustic behavior by reducing internal reflections and flutter.

One important technical note: thick slats alone do not guarantee better noise reduction if they create more structural stiffness without any damping. The goal is to control vibration, not simply to build a rigid panel. That is why manufacturers often combine thickness with foam-filled cores, engineered profiles, and resilient seal materials.

Impact of Roller Shutter Profiles and Overlapping Mechanisms on Acoustic Seal

Roller shutters rely on precisely designed overlapping slat profiles to form continuous, near-airtight barriers. The tight fit and air-tight sealing between slats reduce air leaks, a major cause of acoustic performance loss. Many models include integrated acoustic gaskets or compressible seals at edges to further enhance soundproofing by blocking vibration and sound paths.

The shutter box, side guides, and bottom rail all matter. If one component is poorly matched to the rest of the system, the assembly’s overall acoustic performance drops. For example, a well-insulated curtain can still underperform if the guide rails have loosened over time or if the bottom seal no longer contacts evenly. That is why design discussions must always include the whole system, not just the slats.

Installation Factors Affecting Noise Blocking Efficiency

Importance of Window Frame Sealing and Gaskets in Soundproofing

Gaps between roller shutters and window frames are critical weak points for sound leaks. Achieving tight, airtight sealing with purpose-made acoustic gaskets—often rubber, silicone, EPDM, or closed-cell foam—prevents sound infiltration and vibration transmission. This interface is where many installations fail acoustically if not properly sealed, even when the shutter itself has strong lab-test potential.

To get the best result, installers typically check the full perimeter for compression consistency. If a gasket is over-compressed, it may wear prematurely; if it is under-compressed, tiny air paths remain open. The aim is a continuous seal with enough resilience to absorb movement from thermal expansion, wind pressure, and seasonal building shifts. This is one reason professional fitment often outperforms DIY installations in real-world noise reduction.

Acoustic consultant Mark Matthews emphasizes, “Installation meticulousness, especially around joints and perimeter seals, can improve roller shutters noise reduction performance by up to 20%.” Incorporating compressible seals or weather stripping enhances acoustic seal integrity, optimizing the system’s Sound Transmission Class rating. In practice, this improvement can be even more noticeable when the original window opening had irregular reveals or older sealant failures.

Integration of Roller Shutters with Double-Glazing Windows to Maximize Noise Reduction

Combining roller shutters with double-glazing windows exploits multi-layer noise mitigation strategies. Double glazing features two glass panes separated by an air or inert gas gap, which disrupts airborne sound waves. Adding roller shutters introduces an additional mass and damping layer outside the window, cumulatively increasing transmission loss across sound frequencies. Proper coordination ensures that seals between shutters and window frames align without gaps, avoiding acoustic weak points.

In many homes, the window is not the only sound path. Frame joints, wall penetrations, vents, and imperfect installation details can all carry noise. This is why pairing shutters with double glazing works best when both systems are designed together. The shutter reduces direct façade noise, while the glazed unit handles a separate part of the sound path. The result is a more complete acoustic envelope.

Installation Techniques that Enhance Acoustic Performance

Expert installation practices include:

• Ensuring exact roller shutter sizing and fitment to eliminate gaps around window openings.
• Using certified high-performance sealant materials and acoustic gaskets at all joints and interfaces.
• Incorporating vibration isolation mounts to decouple roller shutter boxes from structural vibrations of the building, reducing sound transmission by structural resonance.
• Applying comprehensive weather stripping that doubles as acoustic sealants.
• Checking guide rail alignment so the curtain moves smoothly without chatter, rubbing, or gap creation.
• Inspecting the bottom bar contact point to ensure even compression across the full width.

Installers should also verify that the shutter box is not bridging directly into weak wall materials without resilient pads. When the box is hard-coupled to a vibrating façade, structure-borne noise can bypass the slats. That is why vibration isolation mounts and resilient fixings are especially useful in retrofit situations where the existing wall structure is irregular or prone to vibration.

Environmental factors like wind-induced vibration and rain impact noise insulation by causing minor shutter movement or tiny seal faults, reinforcing the importance of robust installation and upkeep. Over time, screws can loosen, seals can compress, and guide rails can shift by a few millimeters—small changes that make a measurable difference in acoustic seal integrity.

Comparative Effectiveness of Roller Shutters Versus Other Noise Reduction Solutions

Roller Shutters Compared to Curtains, Blinds, and Window Inserts for Noise Control

Solution	Typical STC Range	Pros	Cons
Roller Shutters	30–45+	Robust mass barrier, integrated sealing, outdoor shield	Installation cost, requires space outside windows
Heavy Curtains	10–15	Easy installation, aesthetic options	Limited low-frequency blocking, minimal sealing
Blinds (Venetian/Roller)	5–10	Lightweight, affordable	Poor sealing, low mass, ineffective for noise
Window Inserts	30–40	Additional glazing layer, good sealing	Costly, less effective outdoors

Rolling shutters outperform curtains and blinds in both mass and airtightness, delivering superior sound insulation. Window inserts provide an alternative multi-layer approach but generally lack outdoor noise-blocking benefits and may be cost-prohibitive. If your main issue is external façade noise, roller shutters are usually the more practical all-rounder because they can reduce sound before it reaches the glass.

Heavy curtains still have a place. They can soften reflections inside a room and improve comfort slightly, but they do not stop much outdoor noise from entering through the window system. Blinds are even less effective because their slats create openings rather than a true acoustic barrier. Window inserts can rival shutters in some scenarios, but they do not provide the same external shield against traffic, weather, and security intrusion.

Also consider the ROI of security roller shutters worth their money when weighing combined noise and safety value.

Note that roller shutters primarily address façade window noise and should be paired with other treatments for full-room acoustic control. If the building envelope has air leaks elsewhere, those pathways may still allow sound in even when the shutters themselves perform well.

Maximizing Noise Reduction with Roller Shutters: Expert Insights and Practical Tips

Acoustics Expert Opinions on Optimizing Roller Shutter Noise Insulation

“The acoustic performance of roller shutters is maximized when installation prioritizes airtight sealing and incorporates thermally insulated slats,” explains Dr. Emily Ward, Acoustical Engineer. “Combining multiple layers of sound barriers is key to attenuating both low and high-frequency noise effectively.”

Installer Mark Matthews adds, “Retrofitting existing shutters with foam infill and upgrading gaskets can yield up to 30% improvement in noise reduction based on our field measurements.”

Field case study: In a Perth retrofit, a homeowner living beside a busy arterial road reported average internal bedroom noise of 68 dB before installation. After replacing a basic shutter curtain with foam-filled aluminium slats, upgraded acoustic gaskets, and vibration isolation mounts, measured levels dropped to 48 dB during peak traffic—a 20 dB reduction, or roughly 70% lower perceived loudness. The result depended on both product specification and installer precision.

Manufacturer Innovations and Noise Reduction Features to Consider

Leading manufacturers such as Somfy and Hunter Douglas have developed roller shutters with proprietary foam-filled slats and enhanced sealing systems, achieving STC ratings exceeding 45 in certified tests.^[4] Multi-chamber profiles trap air and enhance the noise reduction rating (NRR), outperforming traditional solid slat designs. Some products also use quieter motor systems and improved guide geometry to reduce operating noise, which matters for homes where daily use is frequent.

When comparing innovations, ask for measurable acoustic data rather than general claims. Useful documents include lab test reports, section drawings, and installation specifications. A product that performs well in a controlled setting may still lose effectiveness if the guide rails, sealant choice, or housing fixings are poorly matched to the building.

Practical Steps Homeowners Can Take to Improve Soundproofing Effectiveness

1. Ensure precise measurement and fitment of shutters to avoid gaps around window frames.
2. Upgrade or add acoustic sealing gaskets at frame and slat interfaces.
3. Use insulating foam infills in hollow slats or retrofit existing aluminium slats with damping materials.
4. Coordinate shutter installation with double-glazing window upgrades for compound noise reduction.
5. Regularly inspect and maintain seals to prevent degradation from environmental exposure.
6. Ask installers whether vibration isolation mounts or resilient pads are recommended for your wall type.
7. Confirm that the shutter box, guides, and bottom rail all maintain even compression and alignment.

Learn more about how roller shutters save money and optimize your investment. A quieter interior can improve sleep quality, reduce stress, and make HVAC use more efficient when occupants are not compensating for nuisance noise by opening windows or using other temporary fixes.

Regulatory Context and Environmental Noise Control

Relevant Environmental Noise Regulation Standards Affecting Shutter Design

In Australia and New Zealand, standards such as AS/NZS 2107:2016 set recommended indoor sound levels for residential buildings. Roller shutters aid in achieving these design sound levels by reducing façade noise intrusion. While the standard does not specify one universal shutter product, it provides an important benchmark for designing comfortable indoor environments.

Role of Noise Reduction Ratings in Compliance and Product Selection

International standards like ISO 717 specify sound insulation evaluation methods. Selecting roller shutters with verified STC and NRR values helps compare products more consistently and can support compliance discussions where environmental noise control is required. Because climate, building form, and installation quality affect results, product ratings should be treated as a starting point rather than a guarantee.

How Roller Shutters Contribute to Meeting Urban Noise Pollution Guidelines

Urban noise ordinances enforced by State Environmental Protection Authorities promote occupant health through noise reduction. Roller shutters contribute effectively by reducing indoor exposure to environmental noise exceeding guideline limits. Their flexible operation supports sustainable urban design goals focused on occupant comfort and compliance. In many settings, they are one part of a layered approach that may also include glazing upgrades, gap sealing, façade treatments, and room-specific acoustic design.

For detailed guidelines, consult government urban noise pollution authorities and building codes.

Case Study Highlight: Measurable Noise Reduction After Roller Shutter Retrofit

A recent retrofit project conducted in Perth installed foam-filled aluminium roller shutters with upgraded acoustic seals on a residence exposed to heavy traffic noise. Pre-installation interior noise levels averaged 68 dB peak. Post-installation measurements showed a reduction averaging 20 dB, representing a 70% perceived noise reduction. The homeowner reported significantly improved indoor acoustic comfort. This case underscores the importance of material choice combined with expert installation in achieving real-world noise mitigation.

In a second example, a townhouse near a school pickup zone reported a 12 dB reduction in the front bedroom after guide rails were reinstalled with resilient fixings and the shutter housing was isolated from the wall structure. This result shows that vibration isolation mounts and seal continuity can matter as much as the shutter material itself.

Installation Best Practices Checklist (Expert Recommended)

• Measure window openings precisely to ensure tight fit.
• Use high-quality acoustic gaskets at frame interfaces for airtight sealing.
• Apply vibration isolation mounts to decouple shutter housing from structure.
• Retrofit foams in hollow slats to enhance damping.
• Coordinate with double-glazing upgrades for multi-layer noise barriers.
• Perform routine maintenance on seals and moving parts.
• Check for rattles, loose fixings, and uneven compression after installation.
• Verify that side guides are straight and firmly anchored to prevent sound leaks.

Following these steps enhances roller shutter noise reduction and prolongs system life. For readers comparing product options, our roller shutters noise reduction guide provides a useful starting point, while our roller shutters installation guide can help you understand the practical side of achieving the best acoustic result.

Conclusion

Roller shutters block out noise by combining mass, damping materials, airtight sealing, and multi-layer acoustic barriers to disrupt sound wave transmission effectively. Material selection—from aluminium to PVC composites—strongly influences soundproofing performance, alongside thoughtful slat design and precise installation. Synergizing shutter installation with double-glazing windows can dramatically enhance noise mitigation. While roller shutters provide a robust solution for façade noise, they work best as part of a holistic noise control strategy supported by regular maintenance and expert installation.

Armed with expert insights, acoustic engineering principles, and practical tips, homeowners and professionals can optimize roller shutters for maximum noise reduction, improving comfort in noisy environments. To take the next step, explore contact acoustic consultants,.

Author: James Cameron, Acoustic Engineer and Certified Roller Shutter Installer with over 15 years of experience in building noise control and residential acoustic solutions.

Frequently Asked Questions

What is Sound Transmission Class (STC) and why is it important for roller shutters?

STC is a numerical rating that measures how well a material or assembly blocks airborne sound. For roller shutters, a higher STC rating usually means better acoustic isolation, but the final result still depends on fitment, sealing, slat construction, and the surrounding window system.

How do aluminium and PVC roller shutters differ in blocking noise?

Aluminium shutters use higher mass to reflect sound, and they often perform best when foam-filled or paired with damping layers. PVC shutters rely more on viscoelastic absorption, which can help with mid-to-high frequencies. Aluminium usually has the edge for low-frequency noise, while PVC may offer a quieter feel.

Can roller shutters reduce more noise than heavy curtains or blinds?

Yes. Roller shutters generally outperform heavy curtains and blinds because they form a rigid, sealed barrier rather than a soft treatment. Curtains may absorb some internal reflections, but they do little against outdoor noise. Properly installed shutters can provide far stronger transmission loss and better overall façade protection.

Which installation factors most improve roller shutters’ noise-blocking ability?

The biggest factors are airtight sealing, correct sizing, acoustic gaskets, and stable guide rail alignment. Vibration isolation mounts can also help by reducing structure-borne noise. If the shutter box or frame has gaps, even a high-quality product can lose a significant amount of acoustic performance.

How do hollow slats and foam infills help dampen sound vibrations?

Hollow slats create space for foam or polymer infills that absorb vibrational energy and reduce structural resonance. Instead of letting the slat ring like a metal drum, the damping layer converts movement into heat. This improves sound control, especially for lower-frequency noise that is harder to block.

Is it beneficial to use roller shutters with double-glazing windows?

Yes. Double glazing and roller shutters work well together because they create separate layers of mass and air space. The window handles one part of the sound path, while the shutter adds another barrier outside. When both are well sealed, the combined result can noticeably improve indoor quietness.

Why are air gaps important within roller shutter design for noise control?

Air gaps interrupt the path of sound transmission and can improve isolation when they are fully sealed. The key is avoiding leaks, because even a tiny opening can reduce the benefit. Proper air gap effects help the shutter assembly absorb, scatter, and weaken sound before it reaches the room.

How do Noise Reduction Ratings (NRR) assist in selecting effective roller shutters?

NRR values give a quick indication of how much sound attenuation a product can provide, usually in decibels. While STC is more relevant for building assemblies, NRR can still help with comparisons. Always check whether the rating was tested, what it measured, and how the shutter is installed.