Information for Architects & Acoustical Engineers

Soundproof Windows STC Ratings

Resolve Your Noise Issues

A Soundproof Window is a secondary fully operational window added behind the primary window. It has a small unobtrusive footprint that virtually disappears.

With Soundproof Windows you can easily achieve window STCs from 48 to 57. Standard dual pane and single pane windows have STCs ranging from 26 to 32 (the dotted lines in this chart). Add Soundproof Windows (the solid chart lines) behind these primary windows and achieve STCs from 48 to 52. Add more than the typical 3″ of air space between the two windows and easily achieve STCs up to 57.
Keep the same outside appearance for all of the windows on a project. Add Soundproof Windows only behind those windows that need soundproofing. More can be added after project completion if needed.

Soundproof Windows Detailed Engineering Drawings

Engineering Innovation

Rather than modifying some other window design, we designed our Soundproof Windows from the ground up to maximize noise reduction.  Extensive testing and retesting perfected our design, resulting in these superior STC results.  The added benefits were air infiltration reduction and improved insulation values.
Click here to examine detailed engineering drawings.

99% UV Blockage

Low-e glass typically blocks less than 71% of UV radiation. Soundproof Windows use laminated glass which blocks 99% of UV radiation.

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Energy Savings and Insulation Values

Soundproof Windows added to existing windows help insulate and conserve energy. By adding Soundproof Windows, the following can be achieved:

  • Effectively convert a single pane window into a dual pane window
  • Convert a simple dual pane into into a good quality low-e equivalent window
  • Convert a high-efficiency dual pane into a super-high efficiency window


STC Table for Different Windows

STC Results Chart

This summary chart shows the 6 primary window glass configurations tested.  Each configuration was tested by itself and then with the added Soundproof Window at 4 different air spaces (glass to glass measurements) shown to the right.
Click here to review the full details.

Lab Proven STC Ratings

Extensive recent lab tests were performed on Soundproof Windows products by Western Electro-Acoustic Laboratory, an accredited independent acoustic laboratory in California.

A battery of over 40 tests was completed using Soundproof Windows behind six different common primary window glass configurations. Each combination was measured at various air spaces ranging from 2″ to 8″.

Click here to examine the full results and actual test reports.

Window Redesign & Rework Not Required

The primary windows chosen for your project do not need to be modified. Soundproof Windows are secondary windows and are added behind your preferred window to achieve the maximum amount of noise reduction. Soundproof Windows can be added to one area, one side, or the entire project.
The outside appearance stays the same, but can be changed later, and other areas that were not originally designed to be soundproofed can be addressed.

Historical Restorations and Building Conversions

Soundproof Windows can be added to glass in historical buildings where various scenarios can prevent removing the original windows and glass.
Insulation and soundproofing can be achieved in such situations, in addition to solving air infiltration issues found in older windows. It is possible to double the insulation value of the window and reduce air infiltration by over 95% by adding Soundproof Windows.