A Guide To STC Ratings Chart To Achieve Desired Level Noise

When creating comfortable and peaceful living and working environments, noise control is a critical factor to consider. Whether you’re designing a home, office, or any other space, the Sound Transmission Class (STC) rating chart plays a pivotal role in assessing and managing sound transmission. This article will explore the stc ratings chart and we will explore factors affecting STC ratings.

Interpreting the STC Rating Chart

Understanding the STC rating chart is crucial for selecting the appropriate building materials or designs to achieve the desired level of noise control. Here’s a guide to interpreting STC ratings:

STC 25-30

This range provides minimal sound reduction and is suitable for spaces where noise transfer is acceptable, such as non-private offices or storage areas.

STC 35-40

These ratings offer moderate sound reduction and are commonly used for interior walls and floors in residential construction.

STC 45-50

This range represents good soundproofing performance and is suitable for applications where a higher degree of privacy and noise control is needed, such as between hotel rooms or classrooms.

STC 55-60

These ratings offer excellent soundproofing and are often used in premium residential buildings, healthcare facilities, and recording studios.

STC 60+

Ratings in this range provide exceptional soundproofing and are typically found in specialized environments like home theatres, sound studios, or labs.

It’s important to note that achieving a specific STC rating involves using appropriate building materials, construction techniques, and soundproofing solutions. In addition to wall and floor assemblies, other factors like doors, windows, and HVAC systems can significantly impact the overall sound transmission within a space.

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Factors Affecting STC Ratings

Several factors can influence the STC rating of a building assembly:

Material Quality: The type and quality of building materials used in walls, floors, and ceilings play a significant role in sound transmission. Thicker, denser materials generally provide better sound insulation.

Construction Techniques: Proper construction methods, including sealing gaps and joints, can reduce sound leakage.

Airborne and Impact Sound: STC ratings consider airborne sound (speech, music) and impact sound (footsteps, vibrations). Different materials and assemblies may perform differently for each type of sound.

Frequency Range: STC ratings are based on a range of frequencies, but not all frequencies are equally represented. Some materials may be better at blocking specific frequencies.

Resonance and Vibration Control: Vibrations can transmit sound through structures. Adding materials that dampen vibrations can improve soundproofing.

Doors and Windows: These openings are potential weak points in sound insulation. High-quality doors and windows designed for sound reduction can help.


The STC rating chart is essential for evaluating and improving the soundproofing performance of building materials and assemblies. By understanding the STC ratings of different materials and how they impact sound transmission, architects, builders, and homeowners can create quieter and more comfortable spaces that meet their specific needs. Whether you’re designing a peaceful home, a productive office, or any other environment, paying attention to STC ratings can significantly improve the quality of life and work within those spaces.

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