Glossary

Terms for Architecture, Green Building & Energy

This glossary includes more than 300 solar terms, as well as hundreds of additional sustainable design and construction terms.

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Sound Transmission Class (STC)

Definition: a single number rating of partition airborne sound transmission loss across 16 one-third octave bands between 125 Hz and 4,000 Hz as measured in an acoustical laboratory under carefully controlled test conditions. The STC is used during the building design phase to select a particular partition/window configuration to obtain desired sound isolation performance