Acoustic Insulation

Noise is simply categorised as unwanted sound. In order to assess the impact of the surrounding environment, such as roads/motorways, factories, airports, etc, on people, noise assessment can be carried out. These assessments will typically involve the monitoring of sound over a set time period using a sound level meter with an A-weighted filter.

The A weighting is used to simulate the response of the human ear with respect to the various audible frequencies, and is defined in EN 61672-1:2013 [1].

In addition, octave band A weighted sound pressure levels can also be measured to provide more information relating to the specifics of the noise at the location, and enable glazing, and other façade elements to be more appropriately selected.

The requirements will often be provided in a format similar to the below:

Position

Leq Sound Pressure Level (dB) at Octave Band Frequency (Hz)

dB(A)

63

125

250

500

1000

2000

4000

A Leq,16hour

60

55

52

47

48

42

33

52

Noise Limitations

The noise levels within various buildings, for various activities and times of day, are defined by BS 8233:2014 [2]. For example, dwellings have the following requirements:

Activity

Location

07:00 to 23:00

23:00 to 07:00

Resting

Living Room

35 dB Laeq,16hour

---

Dining

Dining Room/Area

40 dB Laeq,16hour

---

Sleeping

Bedroom

35 dB Laeq,16hour

30 dB Laeq,16hour

Other requirements apply for buildings with other uses, and are defined within BS 8233:2014.

For partitions within offices, some guidance is provided within BS 5234-1:1992 [3], including minimum sound insulation performance levels for various locations.

Glazing Selection

When selecting glazing based on acoustic performance, there are two main criteria to consider, weighted values and octave centre band values. Testing of acoustic performance in accordance with ISO 10140-2:2010 [4], previously ISO 140-3:1995 [5], will produce third octave band centre frequency values, from which octave band centre frequency values can be calculated, as well as weighted values, Rw, Rw,C and Rw,Ctr, in accordance with ISO 717-1:2013 [6].

OCTAVE BAND VALUES

The testing provides performance at third octave band centre frequencies, from which the performance at octave band centre frequencies can then be calculated, again, in accordance with EN 10140-2:2010. For this reason, the performance at the one third octave band centre frequencies will not typically match that for the respective octave band centre frequencies, as below.

Third Octave Band Centre Frequency (Hz)

R1/3OCT (dB)

ROCT (dB)

Octave Band Centre Frequency (Hz)

50

63

80

31

35

29

31

63

100

125

160

29

28

27

28

125

200

250

315

28

32

34

31

250

400

500

630

38

40

42

40

500

800

1000

1250

44

43

39

42

1000

1600

2000

2500

39

44

49

42

2000

3150

4000

5000

53

57

57

55

4000

Ctr and C are the spectrum adaptation terms for traffic noise and pink noise respectively, and give an indication of how the glazing will perform with respect to noise from the related sources. When subtracted from the Rw weighted performance, the Rw,Ctr and Rw,C values are obtained. ISO 717-1:2013 also provides some examples of noise sources relevant for these adaptation terms, as below:

Adaptation Term

Noise Source

C

Living Activities (Music, Radio, TV)
Children Playing
Locomotive - Medium & High Speed
Automotive - >80 km/h
Jet Aircraft - Short Distance
Factories - Medium & High Frequency Noise

Ctr

Urban Road Traffic
Locomotive - Low Speeds
Aircraft - Propeller Driven
Jet Aircraft - Distant
Disco Music
Factories - Medium & Low Frequency Noise

Selected Performance Data

The below data is a selection of measured acoustic performances available for Saint-Gobain Building Glass products.

Selected data from Commercial Brochure

More data is available, please contact the Marketing Department.