acoustic secondary glazing

Acoustic Secondary Glazing

Many people would advise that triple pane glass would have a greater sound deadening ability. Unfortunately, triple pane glass only offers a very slight enhancement over standard double pane at lower frequencies due to the additional density of the additional pane of glass. Overall there is very little difference in the Sound Transmission Class rating between triple and double glazing provided that the overall airspace between the panes is constant between the two constructions.

Working Conditions

Higher frequencies are much easier to attenuate than low frequency noises. This means that our secondary glazing may be able to block high pitched music but not be as competent at reducing low pitched sounds such as the bass sounds in music or the traffic driving along the street outside your house.


When a sound wave hits an object some of its energy will be reflected and some absorbed. A material's ability to absorb sound efficiently can be gauged from its sound absorption coefficient. This is defined as the ratio of the sound energy absorbed to the total sound energy arriving at a material's surface.

Noise Reduction

Secondary Glazing is a great way to reduce noise from everyday things such as traffic, pedestrians, airplanes, pubs and clubs.

Sound insulation otherwise known as sound reduction, this is the prevention of noise being transmitted from one area to another.

Secondary Glazing provides better sound reduction as well as heat insulation than standard single-glazed windows and many would consider it essential for houses close to busy roads or other high noise generating objects. When considering windows

there are generally three options available for maximum achievable sound attenuation (reduction):

  • Laminated glass (normally with a interlayer of Polyvinyl butyral),
  • A wider airspace between the panes of glass,
  • Different thickness panes of glass within the Insulating Glass Unit (or IGU)
  • Or a combination of all three.