Part E | Sound Insulation Regulation | Robust Details | Building Regulations
DIY Window Soundproofing
Secondary glazing is the best all round approach for noisy windows but if the costs are prohibitive or you are renting a property then the following suggestions may be helpful.
You need sound absorbing foam in combination with a heavy sound blocking layer
(foam/barrier composites) to reduce traffic noise through windows.
The plug ideally needs to seal well against the battens or frame so sealing tape is a good idea. Its also a good idea to keep the wood sheet from directly touching the frame by using more neoprene strips. The plug needs to fit as tightly as possible. You can increase performance by doubling the layers of composite.
All information contained in these details is given in good faith but without warranty.