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Traffic noise is one of the most common causes of noise complaints in the UK. Secondary glazing is the most effective window-based solution, consistently outperforming double glazing at all traffic noise frequencies.
Road traffic noise combines low-frequency heavy vehicle rumble with mid-frequency tyre noise and high-frequency sounds. Effectively reducing all requires both a substantial air cavity and acoustic glass.
Standard double glazing has 12–24mm air gap. Secondary glazing reveal-fixed creates 150–200mm — up to 15x larger. This is why secondary glazing dramatically outperforms double glazing for traffic noise.
Reveal-fixed, 150mm cavity, 6.8mm acoustic laminate. Achieves 49dB Rw — reduces a busy road to background level noise inside.
Reveal-fixed, 200mm cavity, 8.8mm or 10.8mm acoustic laminate. Achieves 50–54dB — dramatically reduces even major road noise.
WHO recommends 40dB maximum nighttime noise in bedrooms. Properties on busy roads can experience 55–70dB at the window. A 54dB reduction brings interior levels within the WHO guideline — significant benefits for sleep quality and long-term health.
Ready to find out how secondary glazing can benefit your property?