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Understanding Sound

What is Sound

Sound is generated by air particles vibrating due to a noise source causing vibration through the air forming waves of air pressure. The ear then picks up these waves of air pressure and turns them into the sounds we hear. Sound waves are a form of energy that transmit through the air passing through surfaces like walls, floors and ceilings if they are not constructed with enough mass or separation to absorb this energy. In order to successfully soundproof these structures you need to incorporate mass and separation into the buildings structure.

Sound Transmission

Sound transmitting from the source, through the air into the human ear.

Sound sourceSound waveHuman ear

Sound Source                       Sound Wave                         Human Ear

Different Sounds

Airborne Sound - Sound transmitting through the air from the source, talking, shouting, music, TV and barking dogs are examples of airborne sounds. Airborne sounds can transmit through a building if the separating structures do not have enough mass, through holes, and because of a lack of separation in the construction. 

Impact Sound - Sound transmitting through a buildings structure from footfall, children running and furniture being moved would be classed as impact sound. Energy created through impact will vibrate through a buildings structure into other parts of the building, this will happen due to a lack of separation in the buildings structures.

Soundproofing Solutions

In order to successfully reduce airborne and impact noise you will normally have to combine products to achieve the maximum level of soundproofing. Airborne sound can be reduced by increasing mass of the structure, but increasing the separation as well will improve the overall level of noise reduction. Impact sound through a floor can be reduced by de-coupling the ceiling below, creating separation in the ceilings structure. If you have access to the floor above a resilient layer can be laid onto the floors to absorb the impact at the source.

Decibels (dB)

The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Your ears can hear everything from your fingertip brushing lightly over your skin to a loud jet engine. In terms of power, the sound of the jet engine is about 1,000,000,000,000 times more powerful than the smallest audible sound.

On the decibel scale, the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB. Here are some common sounds and their decibel ratings:

Sound Source dB Level
Threshold of Hearing 0
Leaves Rustling 10
Whisper 20
Conversation 50
Busy Traffic 70
Vacuum Cleaner 80
Orchestra 95
Rock Concert 110
Pain Threshold 130
Jet Take Off 140
Perforation of Eardrum 160

Table shows estimates of dB levels, external factors can alter these figures; only use these figures as a guide to sound levels. The only way to accurately measure sound is by performing a sound test using sound recording equipment.

To discuss your requirements please contact us or call 08451 306269.

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