A sound transmission class (STC) is a standard rating of how well a building partition lessens the transmission of airborne sound. The rating reflects the highest decibel reduction a partition can provide.
The test to determine the STC rating of a partition evaluates and quantifies the partition’s ability to insulate, isolate, and/or reduce airborne noise transmission.
STC Testing provides objective data about how well a building assembly blocks airborne noise. Rather than relying on assumptions, owners, architects, contractors, and property managers receive measurable results that can be used during construction, renovations, warranty inspections, or dispute resolution.
Professional STC Testing is especially valuable for:
Testing can identify weaknesses caused by gaps, poor insulation, mechanical penetrations, lightweight construction, or improper installation before they become long-term acoustic problems.
Every building performs differently, which is why our STC Testing process focuses on measuring real-world acoustic performance rather than relying solely on theoretical design values. Our experienced team begins with a thorough site evaluation to understand the building layout and identify the most appropriate testing locations. Using specialized equipment, we generate controlled airborne sound and take precise sound level measurements to calculate accurate Field Sound Transmission Class (FSTC) ratings. After testing is complete, we provide a detailed report outlining the results, along with practical recommendations to improve sound isolation where necessary.
If the testing identifies areas that require better acoustic performance, Florida Soundproofing can recommend customized REVRB® soundproofing solutions tailored to your project. Depending on the building assembly and the source of the noise, these solutions may include acoustic insulation, Green Glue damping compound, Mass Loaded Vinyl (MLV), resilient sound clips, acoustic sealants, upgraded wall systems, and other proven noise control products designed to enhance airborne sound isolation.
Whether you’re evaluating a new construction project, troubleshooting noise complaints, or verifying building performance, Florida Soundproofing provides reliable STC Testing services backed by years of acoustic experience. Our team delivers accurate field measurements, detailed reports, and practical recommendations using proven REVRB® soundproofing solutions.
Contact Florida Soundproofing today to schedule your STC Testing consultation and improve the acoustic comfort of your property.
For more information about Sound Transmission Class ratings and testing standards, visit the National Research Council Canada (NRC)
An STC rating measures the ability of a building assembly to block airborne noises such as speech, televisions, music, and office conversations.
Some building projects, multifamily developments, hotels, and commercial buildings may require STC Testing to verify compliance with project specifications or local building requirements.
Higher STC ratings provide better sound isolation. Most residential interior walls range from STC 30–35, while premium soundproof assemblies often achieve STC ratings above 50.
STC Testing measures airborne sound transmission, while IIC Testing evaluates impact noise such as footsteps, dropped objects, and moving furniture through floors.
