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Noise Reduction With Double Glazed Windows



Double Glazing Sutton in Ashfield

Unwanted sound or noise is everywhere. Whether it originates from road traffic, aircraft, factories, discos or merely from neighbours, noise is a nuisance which can, in the extreme, cause physical and psychological illness, a fact recognised and campaigned against by the World Health Organisation.

Typical 4mm toughened glass will provide a mean noise reduction of Rm = 27dBA while double glazing with a 12mm hermetically sealed air-filled cavity, again using 4mm toughened glass, gives Rm = 29dBA. This 2dBA difference in sound intensity between single and double glazing would barely noticeable for the average person, thus demonstrating that standard double-glazing is not always a suitable and cost effective solution for noise insulation.

In a carefully controlled test, Storm Windows, using only a 40mm air cap and 4mm toughened glass reduced noise to 40dBA (please ask for a copy of the independent record). Noise is measured on a logarithmic scale. In real terms the result is a noise reduction of more that twice that of double-glazing, (Fig 1). The larger air space decouples the acoustic vibration usually present with single or standard double-glazing. The additional mass of glass improves the sound absorption of the total assembly. Space allowing, increasing the air cap up to a maximum of 200mm can also provide enhanced sound insulation.

standard Windows Are Made From A Single Sheet Of 3mm Glass. This Isn't Enough To Provide Acoustic (noise) Insulation. Using Thicker Glass Can Provide Some Insulation. Double Glazing Offers The Best Shield Against External Noises, But Some Types Of Double Glazed Windows Work Better Than Others. Here's What You Need To Know About Noise Reduction With Double Glazing. Double glazing is two sheets of glass separated by an air or gas pocket. Standard double glazed windows have two panes of 3mm glass separated by a 6mm air or gas pocket. This provides thermal (heat and cold) insulation, but not enough acoustic insulation to make a difference if outside noises are a problem.

Researchers have carefully calculated the levels of noise reduction offered by different types of double glazed windows. Thicker glass, a greater gap between panes of glass and using laminated glass are the most effective ways to improve acoustic insulation. These are some of the numbers researchers have come up with. Percentages are improvements over a standard 3mm single glass window: 19%: 4mm/12mm gap/4mm (voice noise reduction) 34%: 10mm/12mm gap/6mm (voice noise reduction) 46%: 10mm/12mm gap/6.38mm laminated glass (traffic noise reduction) 57%: 6mm/100mm gap/4mm (traffic noise reduction) One of the cheapest ways to reduce noises is also the most effective. Rather than replacing your windows, you can retrofit them with windows installed on your existing windows. Usually, these are acrylic windows installed with magnets. The air gap between your existing windows and the new window is 100mm. If properly fitted with no air gaps, this type of double glazing system can reduce traffic noise by up to 75 percent.

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