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 load, 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…..
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