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STC Rating – Measuring Soundproof Windows

Rating Soundproof Windows

All of the major performance attributes of a replacement window are going to be rated by the National Fenestration Rating Council (NFRC). This includes things such as energy efficiency, wind sound-controlload, the amount of light the window lets through, and you guessed it; how soundproof the window is.

The rating that deals with how well a window performs at keeping sound out is called a Sound Transmission Control Rating, or STC rating.

The STC Rating shows a number that tells you how much noise is stopped. The higher the number, the better the window is at stopping unwanted sound.

An STC Rating is a special rating system that works kind of like the Richter Scale for earthquakes (something we in los angeles know all about), in that it is a special rating system that is logarithmic in nature.

Let me explain…..

How the STC Rating System Works

In a system that increases numerically (like percentages), a difference of 10 points would be 10%. However, with an STC Rating that is not the case.

For example, if you increase a window from an STC 28 to an STC 38, you are blocking 90% of the sound! So small movements upward in STC will mean huge gains in performance of your soundproof windows.

Now, if we take that same window up another 5 points to an STC 43, we are now blocking out 95% of the sound. That may not seem like much, but it is 60% of the remaining noise. Now we are nearly soundproof!

looking for soundproof windows for your home? call us today for free in home consultation 818-330-6664