WHAT DOES SECONDARY GLAZING FOR SOUNDPROOFING MEAN?

SLIMLINE SINGLE PANEL UNITOur front bedroom ground flooring noise stages have gone from horrendous, distracting highway noise to hardly a whisper after purchasing a secondary unit. The active road is 3m absent!The corporate talked me with the measuring method and specs for what was an advanced Area to work with, having an abnormal initial body and