What Is the STC Rating of a Movable Partition Wall? A Quick Guide to Acoustic Performance

When choosing an acoustic Movable Partition Wall, sound insulation is often one of the top concerns. A key metric used to measure soundproofing is the STC rating—but what exactly does it mean, and how does it impact real-world performance? This article gives you a clear and concise explanation.

1. What Is STC?

STC stands for Sound Transmission Class. It is a standardized rating that measures how well a building element, such as a wall, door, or movable partition wall, blocks airborne sound. The higher the STC rating, the better the sound insulation.

Example reference:

• STC 25: Clear speech can be heard through
• STC 35: Speech is audible but not intelligible
• STC 45: Most conversations are effectively blocked
• STC 55+: Ideal for spaces requiring high levels of privacy, like conference rooms, hospitals, or luxury hotel suites

2. How Is STC Measured?

STC ratings are determined through laboratory testing. The test involves playing standardized sound frequencies on one side of the wall and measuring how much sound passes through. Common testing standards include ASTM E90 or ISO 140.

Although STC values are usually expressed in decibels (dB), not all dB ratings are STC values—only those derived through standardized lab tests can be officially labeled as STC.

3. Real-World Acoustic Considerations

While STC is a reliable benchmark, real-life acoustic performance also depends on:

• Installation quality – especially the sealing at tracks, floor, and wall junctions
• Space conditions – HVAC ducts, outlets, or any penetrations may affect insulation
• Usage frequency – frequently moved partitions require more robust acoustic seals

4. Daitachi’s Acoustic Range: STC 37–54 Certified

At Daitachi, our Acoustic Movable Partition walls are engineered with certified acoustic performance ranging from STC 37 to 54, covering a wide spectrum of real-world needs. Whether your priority is flexible workspace division or more privacy, we offer solutions that strike the perfect balance between functionality and discretion.

All models are built with high-density acoustic cores, perimeter sealing systems, and optional top/bottom retractable seals to maximize airborne sound insulation—with lab-tested STC reports available upon request.

5. Final Thoughts

The STC rating is more than just a technical figure—it directly affects how comfortable, private, and functional your space will be. Whether you're planning a workplace upgrade, hotel renovation, or conference room design, understanding and choosing the right STC-rated movable partition wall is key to success.

Looking for STC test reports or tailored soundproofing solutions?
Contact Daitachi for expert consultation and soundproof https://www.daitachipartitionwall.com/product/Movable-wall-systems.html target='_blank'>Movable Wall Systems trusted across commercial, hospitality, and institutional projects.