| Noise insulation |
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The noise insulation class is thus determined in this manner
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The impairment of health through noise pollution cannot be denied. Noise levels of up to 90 dB can already be measured in main street traffic in an inner city area. Vinyl windows have positive noise insulation properties and can be allocated to noise insulation class 5 when fitted with suitable glazing.
| Insulation class (Rw* in db) |
Street type | Distance from street |
Vehicles per hour |
| 1 (25 - 29) | Side street | more than 35 m | 10 - 50 |
| 2 (30 - 34) | Side street | 26 - 35 m | 10 - 50 |
| 3 (35 - 39) | Side street | 26 - 35 m | 50 - 200 |
| 4 (40 - 44) | Main street | 100 - 300 m | 1000 - 3000 |
| 5 (45 - 49) | Main street | 36 - 1000 m | 1000 - 3000 |
| 6 (50 - 54) | Highway/Dual carriageway | less than 100 m | 3000 - 5000 |
*Rw is a noise insulation dimension and is measured in decibel (db). Decibel is a logarithm dimension (i.e. even 5 dB more are regarded subjectively as a doubling of noise, 3 - 5 dB less than a halving). First and second insulation classes are used by most window manufacturers. Conventional windows frequently only have an insulation capability of 25 dB. Compared with an outer wall with 55 dB, this means a thousand times less noise insulation. Noise and thermal insulation can be combined ideally in the case of insulation glass.