How do you calculate Sound Transmission Class?

How do you calculate Sound Transmission Class?

Find the average transmission loss: Add up all the total frequencies you recorded, then divide that number by the total number of frequencies you tested. For example, if you recorded all 16 frequencies, divide your total by 16. The number you calculate is your STC rating.

Is 60 STC good?

Understanding STC (Sound Transmission Class) An STC rating of 20 is considered very poor while a rating of 60 is considered excellent . For example, if you were in a room where a wall joining an adjacent room had an STC rating of 20 you would be able to hear someone speaking at a low volume through that wall.

What is IIC sound rating?

Various soundproofing ratings are used to measure impact noises: IIC stands for “Impact Insulation Class”, the degree of soundproofing of the impact noise of a floor/ceiling assembly in a laboratory. The higher the IIC, the better the acoustic insulation.

What does STC 52 mean?

Soundproofing Project Reasonable Expectations and STC Rating Definitions

STC 52-55 Loud speech audible if straining to listen, music can be heard and may still be disturbing
STC 57-60 Loud speech essentially inaudible, music can be heard faintly but bass may still be disturbing

What is sound transmission class?

Sound transmission class. From Wikipedia, the free encyclopedia. Jump to navigation Jump to search. Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations.

How do you calculate STC (Sound Transmission Class)?

The Sound Transmission Class (STC) is determined in accordance with ASTM E413, Classification for Rating Sound Insulation. Calculating STC involves adding something called “deficiencies” and utilizing the STC contour In the table you supply the Transmission Loss data.

What is sound transmission class rating 50?

It is also the point at which respondents to surveys begin a drastic reduction in noise related complaints. With a Sound transmission class rating of 50, speech cannot be heard through the walls, and loud sounds are only faintly audible.

What are the two factors affecting sound transmission class?

Factors affecting sound transmission class. The sound transmission class and thereby soundproofing is affected by the two factors; sound isolation and sound absorption. Sound travels from one area to another in two ways. It travels through the air and it travels mechanically through the mass of the structure.