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How much noise is reduced once the new addon window is installed?

Usually we get around a 10dB drop which is a 50% drop to the human ear, for a brick veneer wall assembly. Sometimes we get less if it is an old weatherboard Queenslander as the new window system will outspec the walls in acoustic control. But a good perceived noise reduction will be noticed.If the property has concrete walls, we would expect to get a 70% reduction in noise.

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