Note! - higher frequency - more attenuation!
The mass m of a concrete floor with density 2300 kg/m3 and thickness 0.2 m can be calculated as
m = (2300 kg/m3) (0.2 m)
= 460 kg/m2
From the chart above the mean sound attenuation for the floor can be estimated to
The attenuation dL at 250 Hz can be calculated as
dL = (52 db) + (- 5 dB)
= 47 dB
The attenuation at 2000 Hz can be calculated as
dL = (52 db) + (7 dB)
= 59 dB
|Building Element||Sound Transmission Loss|
- STC Rating1) -
|230 mm brickwork, plastered both sides||55||Shouting not audible|
|Standard 38- by 89-mm (nominal 2- by 4-in) wood studs with resilient channels nailed horizontally to both sides with 20-mm (5/8-in) gypsum wallboard screwed to channels on each side||50||Shouting barely audible|
|230 mm brickwork, plastered one side||48|
|115 mm brickwork, plastered both sides||47|
|100 mm timber studs, plasterboard both sides, quilt in cavity||46||Loud speech barely audible|
|6 mm double glazing, 100 mm air gap||44|
|75 mm clinker concrete block, plastered both sides||44|
|115 mm brickwork, plastered one side||43|
|Two layers of 20-mm (5/8-in) gypsum wallboard nailed to both sides of standard 38- by 89-mm (nominal 2- by 4-in) studs||40||Loud speech audible but not intelligible|
|75 mm timber suds, plasterboard both sides||36||Loud speech audible and fairly understandable|
|6 mm single glazing||29||Normal speech audible but not intelligible|
|one layer plasterboard||25||Normal speech easily understood|
1) STC - Sound transmission class is the USA rating used to characterize airborne noise insulation. A wall system with higher STC rating is more effective in preventing the transmission of sound.
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.
Effects of low-frequency vibrations on building constructions.
Barriers and enclosures to reduce noise sound pressure levels from machines.
The speed and attenuation of sound in moist air varies with sound frequency and air humidity.
Calculate required number of studs in a wall.
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