Acoustic Partition Test Documents: What to Request

When you specify an acoustic movable partition for a hotel ballroom, a school auditorium, or a corporate training center, the acoustic partition test documents you collect can make the difference between a successful installation and a costly surprise. These documents are not just paperwork—they are the evidence that a partition system can meet the acoustic requirements of your project. But not all test documents are created equal, and knowing what to ask for is essential.

Acoustic movable partition panel core – a close look at the layered construction that contributes to sound insulation.

Why Acoustic Test Documents Matter

Acoustic test documents provide objective data about how a partition performs under controlled conditions. They allow you to compare different systems, verify that a product meets your project’s acoustic criteria, and provide a basis for contractual guarantees. Without these documents, you are relying on marketing claims that may not reflect real-world performance.

For architects and interior designers, these documents also support the design process. They help you calculate the expected sound insulation of a space, coordinate with acoustic consultants, and communicate performance expectations to clients. For contractors and building owners, they offer a way to verify that the installed partition will deliver the promised acoustic environment.

Understanding STC and Rw: The Basics

Before diving into the documents, it’s helpful to understand the two most common acoustic ratings you’ll encounter: STC (Sound Transmission Class) and Rw (Weighted Sound Reduction Index). Both are single-number ratings that summarize a partition’s ability to reduce airborne sound. They are derived from laboratory measurements across a range of frequencies, but they are not identical.

STC is commonly used in North America, while Rw is more prevalent in Europe and international contexts. Both are expressed in decibels, but they are not a direct measure of how many decibels are blocked. Instead, they are a classification based on a standardized curve-fitting procedure. A higher number generally indicates better sound insulation, but the actual performance depends on the frequency distribution of the sound.

Share the track plan, ceiling plan and fixed-service locations.

Send the Coordination Information

When reviewing test documents, pay attention to which rating is used and ensure it aligns with your project’s requirements. Some projects may specify a minimum STC or Rw, while others may require additional metrics like sound absorption or impact insulation.

Key Acoustic Test Documents to Request

Here are the essential documents you should request from any movable partition supplier:

1. Laboratory Test Reports

The most important document is a laboratory test report from an accredited acoustic testing facility. This report should detail the test method (e.g., ASTM E90 for STC or ISO 10140 for Rw), the test specimen description, and the measured sound transmission loss at various frequencies. It should also state the resulting STC or Rw rating.

Ensure the test report corresponds to a partition configuration similar to yours. Movable partitions can have different performance depending on panel size, seals, and stacking configuration. If the supplier has multiple test reports, ask for the one that matches your intended use.

2. Test Specimen Description

Every laboratory test report should include a detailed description of the test specimen. This includes the panel construction, dimensions, weight, and any seals or gaskets used. This information is crucial because it tells you whether the test results are applicable to the actual product you plan to install.

For example, a test report for a 100 mm thick panel may not be relevant if your project requires a 150 mm thick panel. Always verify that the specimen description matches the product specification from the supplier.

3. Field Test Reports (If Available)

While laboratory tests are the standard for comparing products, field tests provide insight into real-world performance. Field tests are conducted in actual buildings and account for flanking paths, installation quality, and other factors. However, they are more variable and are not always available.

If a supplier provides field test reports, ask about the conditions of the test, such as the type of building, the installation team, and whether any remedial work was done. Field tests can be useful but should be interpreted with caution.

4. Certification Documents

Some suppliers may have their partitions certified by third-party organizations, such as the Sound Insulation Advisory Service or similar bodies. These certifications often involve periodic testing and factory inspections. Ask for copies of any relevant certification documents.

Be aware that certifications can be specific to certain product lines or configurations. Verify that the certification covers the exact model you are considering.

5. Installation Guidelines Related to Acoustics

Acoustic performance is not solely determined by the partition itself; it also depends on proper installation. Request the supplier’s installation guidelines, especially those that address acoustic sealing, perimeter conditions, and interface with the building structure. These guidelines should be part of the project documentation and may be referenced in the test report.

How to Verify Test Documents

Not all test documents are equally reliable. Here are some tips to verify their authenticity and relevance:

Approved movable-partition visual reference.

Check the Testing Laboratory

The testing laboratory should be accredited by a recognized body, such as NVLAP, UKAS, or an equivalent. The report should include the laboratory’s accreditation number and a statement of conformity to the relevant test standard. You can check the laboratory’s scope of accreditation to ensure they are qualified for acoustic testing.

Look for the Date of Test

Acoustic standards evolve, and test methods are periodically updated. Ensure the test report is current and was conducted under the latest version of the standard. Older reports may not be valid for current building code requirements.

Check the route, supports and clearances on coordinated drawings.

Request a Drawing Review

Compare with Similar Products

If you are evaluating multiple suppliers, compare their test reports on a like-for-like basis. Look at the same frequency bands, the same test standard, and similar partition configurations. This will help you make an informed decision.

Request the Full Report

Some suppliers may provide only a summary sheet with the STC or Rw rating. Ask for the full laboratory report, including the frequency data. This allows you to assess performance at specific frequencies that may be important for your project, such as low-frequency noise from HVAC systems.

Beyond the Numbers: Other Acoustic Considerations

Acoustic performance is not just about the partition panel. The overall sound insulation of a space depends on several factors:

Perimeter Seals and Gaps

Movable partitions rely on perimeter seals to prevent sound leakage at the top, bottom, and vertical joints. Ask the supplier about the sealing system and how it is tested. The test report should include information about the seals used during testing.

Flanking Paths

Even the best partition will not perform well if sound can bypass it through the structure. Ensure that the partition interfaces with the building structure in a way that minimizes flanking. This may involve acoustic barriers above the ceiling or at the floor.

Pass Doors and Glazing

If your partition includes pass doors or glazing, these elements can affect acoustic performance. Ask for separate test data for these components or for the complete partition assembly. The supplier should be able to provide documentation for the entire system.

Project Documentation and Support

Acoustic test documents are part of the broader project documentation that a responsible supplier should provide. This includes drawings, installation manuals, and maintenance guidelines. Ensure that the supplier is willing to support you throughout the project, from design to installation.

At EBUNGE, we understand the importance of reliable acoustic data. Our team can discuss your project-specific acoustic requirements and provide the relevant documentation. We recommend that you always request the full test reports and verify that they align with your project’s needs.

Frequently Asked Questions

What is the difference between STC and Rw?

STC (Sound Transmission Class) and Rw (Weighted Sound Reduction Index) are both single-number ratings for airborne sound insulation. STC is mainly used in North America, while Rw is used internationally. They are calculated from laboratory measurements but use different frequency weighting curves. Both are expressed in decibels, but they are not directly comparable.

Can I rely on a supplier’s brochure that states an STC rating?

Brochures can be useful for preliminary comparisons, but they are not a substitute for full laboratory test reports. Always request the complete test documentation to verify the rating and understand the test conditions.

Do field tests always match laboratory tests?

Field tests often show lower performance than laboratory tests due to factors like flanking paths, installation quality, and site conditions. That’s why it’s important to review both laboratory and field test data if available.

What should I do if the test report is not available?

If a supplier cannot provide test reports, you should be cautious. Acoustic performance claims without supporting documentation are not verifiable. Ask for a written explanation or consider other suppliers.

How often are acoustic tests updated?

Acoustic tests are typically valid as long as the product design and test standards remain unchanged. However, standards can be revised, so it’s wise to check the date of the test and whether it meets current code requirements.

Conclusion: Make Informed Decisions

Acoustic test documents are a vital tool for ensuring that your movable partition meets the acoustic needs of your project. By requesting and carefully reviewing these documents, you can avoid performance issues and ensure that the space functions as intended. Remember to verify the laboratory’s accreditation, compare like-for-like data, and consider the entire acoustic system, not just the panel.

We encourage you to confirm all acoustic, dimensional, and project-specific requirements with our technical team to ensure the best outcome for your space.