Acoustic Performance

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	View some examples of acoustic performance ... [More]


	Typical Sound Levels

	The decibel scale (dB): 140 Threshold of pain 75 Average traffic (kerbside) 130 Pneumatic drill 65 Conversational speech 120 Loud car horn (1 metre) 30 Library 90 Inside tube train 0 Threshold of hearing

	Apparent Loudness

	3 dB - Just perceptible 5 dB - Clearly noticeable 10 dB - Twice or half as loud

	Sound Insulation Indices


	Rm. - Mean Reduction (dB) Average of measurements “Not very practical” Rw - Weighted reduction (dB) Corrected for ear’s response “speech, some forms of music” RTRA - Traffic Noise Reduction (dBA) Performance against typical traffic noise “low frequency noise”


	Acoustic Privacy - Rw


	25 dB Normal speech can be easily overhead 30 dB Loud speech can be heard clearly 35 dB Loud speech can be distinguished under normal conditions 40 dB Loud speech can be heard but not distinguished 45 dB Loud speech can be heard faintly but not distinguished 50 dB+ Loud speech or shouting can be heard with great difficulty


	Single / Double Glazing


	Single Glazing

Thickness (mm)	Rw	RTRA
4	31	27
6	32	28
8	34	30
10	36	32
12	37	33
15	38	34
19	40	35


	Double Glazing

Unit	Rw	RTRA
4/12/4	31	25
6/12/6	33	26
6/12/6.4 pvb	34	27
10/12/4	36	29
10/12/6	38	32
10/12/6/ pvb	40	34
6/12/6.8 Phon	38	32
16 Phon/12/16 Phon	48	42


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