Environmental Noise Control, Inc. offers modular K-Rail mounted sound walls in various heights, built to fit your needs.

ENC’s patented K-Rail mounted sound walls can be quickly positioned and moved to provide a flexible noise control solution for mobile equipment or operations. ENC’s newly redesigned double K-Rail frame allows for heights up to 20 feet, depending on the site and environmental restrictions. These sound walls are an effective solution if your project does not allow earth boring.

At the heart of ENC’s free-standing noise control systems are ENC’s noise barrier blankets manufactured using state-of-the-art acoustical composite materials. They are available in STC-25 and STC-32 with NRC overlays.

An independent laboratory has tested ENC’s acoustical blanket materials.

Engineering/calc packages available.

About ENC’s K-Rail Mounted Sound Walls

  • Specs

  • Sound Transmission Class rated at STC-25 OR STC-32 in accordance with ASTM E-413
  • Engineered to meet UBC/IBC Wind Load Requirements
  • Flame Retardant to California Fire Marshall f-419.01 Specifications
    • Length of Char: 3.5, After Flame: 2 seconds
  • Working Temperature: -40°F to +200°F
  • Oil Resistant, UV Resistant, Fiber-Free, Anti-Fungal, Self-Drying Poly-Vinyl Chloride Outer Shell with specifically developed inner core septum barrier
  • NRC Overlays Available

STC-25 Sound Transmission Loss (dB)

% Octave Band Center Frequency STC-25 Transmission Loss % Octave Band Center Frequency STC-25 Transmission Loss
63 Hz 8 dB 630 Hz 33 dB
80 Hz 10 dB 800 Hz 36 dB
100 Hz 11 dB 1000 Hz 39 dB
125 Hz 10 dB 1250 Hz 41 dB
160 Hz 7 dB 1600 Hz 41 dB
200 Hz 7 dB 2000 Hz 40 dB
250 Hz 11 dB 2500 Hz 41 dB
315 Hz 17 dB 3150 Hz 44 dB
400 Hz 23 dB 4000 Hz 46 dB
500 Hz 28 dB 5000 Hz 50 dB

STC-32 Sound Transmission Loss (dB)

% Octave Band Center Frequency STC-32 Transmission Loss % Octave Band Center Frequency STC-32 Transmission Loss
63 Hz 16 dB 630 Hz 34 dB
80 Hz 20 dB 800 Hz 35 dB
100 Hz 18 dB 1000 Hz 35 dB
125 Hz 16 dB 1250 Hz 36 dB
160 Hz 16 dB 1600 Hz 36 dB
200 Hz 17 dB 2000 Hz 36 dB
250 Hz 19 dB 2500 Hz 37 dB
315 Hz 23 dB 3150 Hz 39 dB
400 Hz 26 dB 4000 Hz 40 dB
500 Hz 32 dB 5000 Hz 43 dB

US Patent Number: 11,879,588 B2  | Canadian Patent Number: 9033537

Frequently Asked Questions About K-Rail Mounted Sound Walls

What Is a K-Rail Mounted Sound Wall?

A K-Rail mounted sound wall is a modular, freestanding noise barrier system built on ENC’s patented K-Rail frame. It’s designed for job sites where space is at a premium or shifting operations need a noise control solution that can be positioned as close to the equipment as possible, without disturbing the ground beneath it.

How Tall Can a K-Rail Mounted Sound Wall Be Built?

ENC’s redesigned double K-Rail frame supports heights up to 20 feet, depending on site conditions and environmental restrictions. Our engineers confirm the right height for your project during the consultation.

Do K-Rail Mounted Sound Walls Require Digging or Ground Disturbance?

No. K-Rail mounted sound walls are a “no-drill” solution that leaves ground intact, making them a practical option for sites where earth boring isn’t allowed or isn’t practical.

What Sound Transmission Class (STC) Ratings Are Available?

K-Rail mounted sound walls are available in STC-25 and STC-32, with NRC overlays available for additional sound absorption. Ratings are independently laboratory tested in accordance with ASTM E-413.

Can K-Rail Mounted Sound Walls Be Repositioned During a Project?

Yes. The modular design is built to be quickly positioned and moved throughout the life of a project, so the barrier can follow mobile equipment or shifting operations instead of being fixed in one location.

Are Engineering Calculation Packages Available for Permitting?

Yes. ENC provides engineering and calculation packages, including UBC/IBC wind load compliance, to support your permitting and site approval process