Expansion Joints--Terms and Terminology: SOUND TRANSMISSION CLASS

Expansion Joint and Joint Sealant Glossary Index:

- Adhesion in Tension

- Blockout

- Compression Set

- Continuity of Seal

-  Expansion Joint

- Nosing Material

- Non-Invasive Anchoring

- Split Slab

- Sound Transmission Class (STC)

- Thermal Shock

Sound Transmission Class (STC)--The Sound Transmission Class - STC- is a single-number rating of the airborne sound transmission loss (TL) performance of a construction measured at standard one-third octave band frequencies. 

The higher the STC rating, the more efficient the construction will be in reducing sound transmission within the frequency range of the test.