Secondary glazing correctly specified and installed will acoustically outperform all other types of glazing, including new windows and even triple glazed ones. Installing good secondary glazing really is the best option eah and every time. To achieve up to an 80% acoustic performance we recommend the specification of acoustic glass and an air cavity no less than 150mm – 200mm glass to glass
Sound is measured as a pressure and expressed in dB (decibels), where to the human ear a change of 3dB is just about noticeable. An increase in pressure levels to 10dB approximates to a doubling of loudness.