Q: Does adding more glass layers or increasing glass thickness always provide better sound insulation?

A: Not necessarily. Glass sound insulation depends on how its acoustic properties match the noise spectrum, not simply on the number or thickness of glass layers. Increasing glass thickness or adding more layers mainly changes the mass of the glazing, but doesn't necessarily change the fundamental sound transmission path.

Vacuum glass uses a vacuum layer between the glass panes to reduce sound transmission through the cavity. This structural design can provide high sound insulation performance while maintaining a relatively slim overall thickness.

Therefore, the acoustic performance of glazing should not be judged solely by specifications such as the number of glass panes or cavity layers. When evaluating sound insulation, it is more important to refer to the acoustic test report, particularly the Rw (weighted sound reduction index) and the associated spectrum adaptation terms (C; Ctr), which indicate performance across different noise frequency ranges.