We receive many questions regarding the acoustic performance of a typical window and how to increase the sound insulation.
When deciding what option of glass to use and there are many, you must first determine the noise source you are trying to reduce. Typical noise sources include motorways or main roads, airports, factories emitting medium and high frequency noise, railways, and busy public places including pubs and discos.
A typical 28mm unit using 4mm glass on both sides will give a sound reduction of 29dB
If you change the outer-pane to 6mm this will increase the sound reduction to 32dB and changing the outer-pane to 10mm will increase this further to 38dB (however using 10mm on larger openings is not advisable)
If you require a dB reduction greater than 35dB you will need to consider specialist options such as Pilkington Optiphon.
Please note that 3dB difference is barely discernible, 5dB difference is clearly discernible and 10dB difference is the equivalent of halving the noise.
Depending on which glass configuration you choose to suit the acoustic performance required will restrict us from being able to energy rate the product through the BFRC.