Why secondary glazing works! The science behind secondary glazing. 
The difference the cavity makes: 
The cavity or gap between an existing primary window and the secondary unit can make a significant difference to the level of noise insulation. Unlike sealed units where the two pieces of glass are rigidly coupled together, the primary and secondary windows act as independent barriers to the transmission of noise. 
Secondary glazing is an effective method of reducing noise pollution, whether you are looking to guard against noise, road traffic or to retain noise i.e pubs, clubs etc. By increasing the gap, otherwise known as the cavity, between the existing window and the secondary frame, the better the sound proofing becomes. Road traffic noise pollution can be reduced by up to 75% and can be reduced further by using acoustic glass. 
Fitting secondary glazing can reduce busy noise traffic by up to 75%. Suitable for both domestic and commercial properties. 

How does sound travel? 

Sound travels through the air like ripples on a pond surface. The sound radiates outwards in all directions from the source, Gradually reducing intensity or untill an object stops its progress. 

Sound (db Decibels) 

Sound is described in different ways but primarily in terms of intensity and frequency. The sound intensity is described in db. A low db indicates a soft sound; a high db value indicates a loud sound. Frequency describes how high or low pitched the sound is (Hz). 

Sound Reduction 

A sound's volume at 60dB decreased by... 
3dB is just perceptible 
5dB clearly noticeable 
10dB half the original volume 

Recommended Indoor Ambient Noise Levels In Dwellings: 

Bedrooms 30-35dB 
Living rooms 30-40dB 

Test results carried out at BRE 

At the Building Research Establishment in Watford, a primary window with 4mm glass was tested with our secondary glazing installed behind and achieved the following results. 

The Existing Window Achieved a Reduction of 26 dB 

With secondary glazing installed with a 100mm air gap between the two, the following results were achieved: 
Estimated Reduction 
4mm Glass 
6mm Glass 
Acoustic Glass 

What is Stadip Silence Glass? 

SGG STADIP SILENCE contains a special acoustic interlayer which not only bonds the glass but also acts as a dampening core between the glass panes, preventing sound frequencies vibrating from one pane of glass to the other. 
Normal windows have a `resonant frequency`, at which they vibrate more significantly reducing their acoustic insulating performance. Stadip Silence Glass in secondary windows will considerably reduce the passage of sound frequency. 
Additional benefits are its full compliance as a security and safety glass with the benefit of UV filtration helping protect furnishings from fading. 
SGG STADIP SILENCE is ideal for any application in the home where there is a need to insulate against excessive noise levels. It is particularly effective against traffic noise when used in windows facing onto busy roads. 
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