Thursday, April 24, 2014

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(STC) Sound Transmittance Class - Acoustical Performance Test Reports

WinDoor Sliding Glass Doors and WinDows are designed to achieve a significant reduction in the transmission of sound. The combination of laminated glass and low air infiltration will achieve a quieter,  Studio - Private Home or Business Setting.

Architects,Interior designers and builders have a responsibility to design functional and safe sound environments. It is very difficult, if not impossible to meet these goals without considering acoustics.




A laboratory rating dubbed Sound Transmission Class (STC) is used to measure sound-deadening ability, The higher the STC number, the more sound is diminishedi. (see chart).


STC Rating Description of Performance
30 Loud speech understood fairly well
35 Loud speech audible but unintelligible
42 Loud speech audible as a murmur
45 Must strain to hear loud speech
48 Some loud speech barely audible
50-55 Loud speech not audible


What is a STC Rating?

STC ratings are an established way to average how much sound is stopped by something. STC ratings are used for windows, doors, walls and most building materials. For windows, STC ratings range from 18 to 55 ... At WinDoor we have a STC ranges up to 54
which fall into Loud Speech Not Audible range from 50-55.

STC rating measurement uses a special scale like the Richter Scale for earthquakes. An increase from 28 to 38 means 90% of the noise is reduced. A change from 28 to 43 represents a noise reduction of over 95%. Even the smallest increases can mean a lot of extra noise reduction. The increase from 38 to 43 mentioned above does not sound like much (90% versus 95+% in reductions) - but going from 90% to over 95% means that 60% of the remaining noise was removed... Every number represents a large amount of noise removed. The higher the STC, the more sound is stopped.

 Certified STC Reports

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