Understanding 1/4" Cork Underlayment Sound Rating
In the realm of flooring, sound control is often an overlooked aspect, but it's a crucial factor in creating a comfortable living or working environment. One material that's gaining traction for its sound dampening properties is 1/4" cork underlayment. This article delves into the sound rating of this eco-friendly flooring solution, helping you make informed decisions for your space.
What is Sound Rating?
Before we dive into the specifics of cork underlayment, let's first understand what sound rating is. Sound rating, often measured in Impact Insulation Class (IIC) and Sound Transmission Class (STC), quantifies a material's ability to reduce sound transmission through floors and partitions. IIC focuses on impact noise, like footsteps, while STC evaluates airborne noise, such as conversation or music.
Why Consider Sound Rating?
High sound ratings can significantly improve the acoustics of a space, reducing noise transfer between floors and rooms. This is particularly important in multi-family dwellings, offices, and schools, where noise pollution can negatively impact comfort, productivity, and even health. Moreover, high sound ratings can contribute to a more peaceful environment, enhancing the overall quality of life.

1/4" Cork Underlayment: An Eco-Friendly Sound Solution
Cork underlayment, derived from the bark of cork oak trees, is a sustainable and renewable flooring solution. Its unique cellular structure, composed of millions of air-filled pockets, gives cork exceptional sound absorption and insulation properties. Let's explore how 1/4" cork underlayment fares in terms of sound rating.
Impact Insulation Class (IIC)
1/4" cork underlayment typically achieves IIC ratings between 65 and 70, which is considered excellent for impact noise reduction. This means it effectively dampens footfalls, furniture movement, and other impact noises, making it an ideal choice for high-traffic areas and multi-level buildings.
Sound Transmission Class (STC)
In terms of airborne noise reduction, 1/4" cork underlayment usually scores between 45 and 50 on the STC scale. While these ratings aren't as high as dedicated soundproofing materials, they still provide a noticeable improvement in sound transmission reduction, making conversations and music less audible to neighbors.

Factors Affecting Sound Rating
It's essential to note that sound ratings can vary among different brands and products of 1/4" cork underlayment. Factors influencing sound rating include the underlayment's density, thickness, and any additional sound-dampening technologies incorporated into its design. Always check the product specifications for the most accurate sound rating information.
Installing Cork Underlayment for Optimal Sound Performance
Proper installation is key to achieving the best sound performance from your 1/4" cork underlayment. Ensure the underlayment is laid in a staggered pattern, with seams offset from one another to minimize noise transfer. Additionally, consider using a vapor barrier and a transition strip at doorways to further enhance sound control.
Cork Underlayment: More Than Just Sound Control
While sound rating is a significant benefit of 1/4" cork underlayment, it's not the only advantage. Cork underlayment also provides excellent thermal insulation, reducing energy loss through the floor. Moreover, it's comfortable underfoot, helps absorb shock, and offers a degree of moisture resistance. Its eco-friendly credentials and aesthetic appeal further add to its allure.
Making an Informed Decision
When selecting a flooring underlayment, consider your specific needs and priorities. If sound control is a primary concern, 1/4" cork underlayment is a strong contender due to its impressive sound ratings and additional benefits. However, always compare products and consult with professionals to ensure you're making the best choice for your space.
More Details
The Impact Insulation Class (IIC) ratings for WECU cork underlayment demonstrates its superior sound control across various scenarios.

09.01.2026 ... A 12 mm (approximately 1/2 inch) cork underlayment for acoustic insulation delivers the highest level of impact noise reduction. This ...

We've our ½”. ¼” and 1/8” cork underlayment offers a reduction of 48 dB, 23dB, 13dB, and 10mm and ½” floating cork flooring offer a ...

CORKPLUS 250 - 2.5 MM. YES. 3/4” GYPSUM CONCRETE. GLUED VINYL PLANK. 51 ... SOUND RATINGS FOR ACOUSTICORK® SOUND CONTROL UNDERLAYMENT FLOOR/CEILING ASSEMBLIES.

See our website for specific details. Sound Ratings for AcoustiCORK® R60 Sound Control Underlayment. Floor/Ceiling Assemblies. Test. Subfloor. AcoustiCORK.

The 12mm (½”) cork underlay has been tested and found to absorb 48 dB of noise and 6mm (1/4”) cork underlay absorb 23 dB of noise. This is the number that.

Acoustic underlayment is primarily used to improve IIC ratings in flooring systems (read Comparing Sound Ratings). With so many different types of acoustic ...

21.04.2008 ... This will act as your initial sound and impact insulation. By having the Sound 6 installed over the cork this prevents the cork underlayment ...

CORK UNDERLAYMENT SPECIFICATIONS ; Acoustical properties under ceramic tiles ; Impact Noise Rating (INR), 7 ; Impact Insulation Class (IIC), 58 ; Sound Transmission ...

Reduces sound transmission from both the surface of a floor as well as through the floor to living spaces below · Use under ceramic tile, stone, marble, ...

ACOUSTICAL RATING. Acoustical rating results below were generated from field testing: 1/4" (6MM) CORK UNDERLAYMENT WITH SUSPENDED CEILING. INSTALLATION. Read ...

1/4″ (6mm) Cork Acoustical Ratings: ; STC, IIC ; Concrete Slab 8″, 58, 60 ; Concrete Slab 6″, 53, 58 ; Concrete Slab 4″ & Steel Deck, 60, 64 ...
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19.03.2021 ... Manufacturer guidelines say 1/8" underlayment for floating floor & recommend cork. Twice the sound control is with 1/4 " cork.

floor, guaranteeing even greater energy efficiency and acoustic insulation. Underlayment may consist only of cork agglomerate or contain other recycled ...

Thermal Resistance: R-Value of 0.74; Sound Ratings: 74 IIC & 70 STC under ceramic tile on a 6 in. cement slab with suspended ceiling, and 22 Delta sound rating.

1/4" (6mm) Cork Underlayment Sheets — flooring underlayment for sound ... 82. Sound Rating: IIC 51, STC 54 (6 inch concrete slab w/ no drop ceiling).

EUROCORK ACCOUSTIC SPECIFICATION · EUROCORK FLOATING CORK TILES · Product: EuroCork UNICLIC floating floor for commercial · Sizes: 35 13/16” x 11 13/16” x 1/2".

Made up of over 100 millionprism shaped cells per cubic inch, each one filled with air, cork inhibits the conduction of temperature and sound.

QEP - 1/4" NATURAL CORK UNDERLAYMENT ... QEP Natural Cork Underlayment Rolls reduce sound transmission from both the surface of a floor as well as through the ...

Cork Underlayment – 1/4″ (6mm) – 150 sq.ft. · 6mm Cork Underlayment Overview · Info & Guides.
