Optimising Acoustic Performance in Modern Interiors

How Acoustic Performance is Measured Globally

Acoustic ratings vary across regions. Understanding the different systems ensures your specification aligns with project requirements worldwide.

Acoustic Differences between Timber and Aluminium Battens

Timber Battens

• Naturally reflective but can be highly effective for acoustic tuning when used with acoustic backing, insulation, and cavity depth.
• Offer a warm, organic aesthetic and excellent control over how sound is absorbed, diffused, or reflected.

• Ideal for projects where both sustainability and acoustic performance are key considerations.

Aluminium Battens

• Have a harder, reflective surface that also requires acoustic treatment to absorb sound effectively.
• Perform exceptionally well when combined with acoustic backing and insulation, achieving comparable results to timber.

• Durable, non-combustible, and ideal for high-performance environments where fire or moisture resistance is essential.

Key Factors That Influence Acoustic Performance

The acoustic performance of Click-on Battens depends on how they’re configured.

1. Acoustic Backing

• Perforated or fabric backings allow sound to reach absorptive layers
• Essential for effective performance with aluminium battens

2. Cavity Depth

• A deeper cavity between battens and the substrate increases absorption, especially at lower frequencies

3. Insulation

• Adding insulation behind battens significantly boosts absorption across frequencies

4. Batten Spacing

• Narrower gaps = greater surface coverage, more reflection
• Wider gaps = more sound passes through to absorbent backing

Applications of Acoustic Battens

Our Click-on Battens are used globally across industries where acoustic control is essential, including:

• Theatres & auditoriums: enhancing clarity and sound quality
• Education: reducing reverberation in classrooms and lecture halls
• Commercial offices: improving speech privacy and comfort
• Healthcare: lowering stress through quieter environments
• Transport hubs: reducing echo in large, hard-surfaced spaces.

How to Specify Acoustic Battens for Your Project

• Define acoustic targets: NRC or αw
• Choose material: timber or aluminium, along with acoustic backing
• Configure for performance: adjust spacing, backing, cavity, and insulation
• Use digital tools: Sculptform’s Price & Spec Tool helps model battens and estimate acoustic outcomes

Finding the Right Acoustic Solution

Acoustic performance is a critical element of modern design, and Sculptform’s Click-on Battens make it possible to achieve both stunning aesthetics and reliable sound absorption. Whether you’re working to NRC in Australia, NZ, and North America, or αw in UK/Europe, the right configuration of battens, backing, and insulation ensures your project meets its acoustic goals.

Ready to explore acoustic battens for your next project? Try our Price & Spec Tool to get the right configurations or contact our team to discuss your requirements.

Frequently Asked Questions

Q: What’s the difference between NRC and αw?
A. Both NRC (Noise Reduction Coefficient) and αw (Weighted Sound Absorption Coefficient) are single-number ratings that describe how well a material absorbs sound, but they’re calculated differently and used in different regions.

• NRC (ASTM C423)

• Common in Australia, New Zealand, and North America.
• Calculated as the average absorption at four mid-range frequencies (250, 500, 1000, and 2000 Hz).
• Provides a quick, simplified snapshot of a material’s overall sound absorption.
• Example: NRC 0.80 means the material absorbs 80% of incident sound energy in that range.

• αw (ISO 11654)

• Used primarily in Europe and the UK.
• Based on absorption data across multiple frequencies, then weighted to create a single-number value.
• Results are also expressed as an absorption class from A (highest) to E (lowest) for easier comparison.
• Example: αw 0.85 (Class A) indicates very high absorption performance.

Q: What NRC or αw rating is considered good for acoustic battens?

A. A higher value indicates better sound absorption. As a guide:

• NRC / αw 0.70–0.90 = excellent sound absorption (Class A–B under ISO 11654)
• NRC / αw 0.50–0.65 = moderate absorption (Class C)
• Below 0.50 = primarily reflective surfaces
  For most interior applications such as classrooms, offices, or theatres, a rating above 0.70 is ideal.

Q: Do timber battens perform better than aluminium battens?

A. Not inherently - both materials need acoustic treatment (backing, insulation, and cavity depth) to absorb sound effectively. When configured identically (e.g. 7mm acoustic backing, 25mm acoustic batts, 90mm stud cavity), timber achieves NRC 0.88 and aluminium achieves NRC 0.82 - a minor difference acoustically.

Q: What affects the acoustic performance of battens most?

A. The key factors are:

• Batten spacing - wider gaps allow more sound absorption
• Backing type - perforated or acoustic fabric improves performance
• Cavity depth - deeper cavities enhance low-frequency absorption
• Insulation - crucial for higher overall absorption values

Have any questions?

Need help specifying the right acoustic solution? Our experts can guide you through materials, spacing, and performance options.