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What type of wall are you soundproofing ?
Timber Joist Floor
Solid Concrete Floor
How to soundproof a wall
To achieve the best results when soundproofing a floor it is important to limit the transfer of impact noise (the likes of footsteps or dragging furniture) by using a soundproofing solution which adds a cushioning layer to absorb impact vibration. Proven acoustic insulation solutions like SoundMats act like a floating floor, which help to absorb impact vibration before it enters the structure of the floor.
For timber floors it is also important to reduce the amplification of sound within the sealed cavity between the floor joists and ceiling below by adding acoustic insulation such as mineral wool between joists. The addition of mass to the floor also helps to create a barrier to block sound waves. e.g. 300mm of concrete will naturally block more sound than 10mm of timber. Using different types of mass also helps to block different frequencies of sound.
The 3 main principles of soundproofing:
Add acoustic mineral wool within cavities. This helps to prevent sound resonating and amplifying within cavities
Absorb impact vibrations at the source before they have chance to enter the structure
Increase the mass of the floor to block unwanted airborne noise. Use different types of mass to block different frequencies of sound