The extra ‘barrier’ provided by noise cutting down secondary glazing can decrease noise stages considerably by nearly 80% or perhaps the equivalent of 54dB. This window soundproofing result decreases website traffic noise from a roar into a whisper. Bought 2 x tilting vertical sliders to the front sash windows https://glennz160uqi5.rimmablog.com/33807927/how-much-you-need-to-expect-you-ll-pay-for-a-good-noise-control-secondary-glazing