Acoustic insulation glass

Noise surrounds us in a number of forms. With increasing city densities, the effects of noise become greater and cause stress, tiredness or even a loss of hearing ability. In most cases we are unable to reduce the noise at source, so we must take effective measures against it. In order to fight noise, we must understand its nature, we must know how to measure noise and how glass can be used as an effective instrument against noise. An introduction to the theme is shown in the technical introduction – noise and how it is measured.

Acoustic glazing is often required to perform the additional function of safety. The individual sheets can, depending on code requirements be manufactured as SECURIT tempered safety glass or STADIP laminated safety glass.

1. technical Data

Dimension max. 3210 x 6000 mm

CLIMAPLUS ULTRA N ACOUSTIC

Glass type	R_w in dB	C, C_tr	Light transmission τ_v to DIN EN 410 in %	Total Energy transmission (solar factor) to DIN EN 410	U_g- Value to DIN EN 673 in W/m².K*
26/36 cavity 16 mm (A)	35	-1, -5	79	60	1,1
24/37 cavity 12 mm (K)	37	-3, -7	78	59	1,0
28/37 cavity 16 mm (A)	37	-2, -6	78	59	1,1
32/37 cavity 20 mm (A)	37	-3, -7	78	59	1,1
30/38 cavity 16 mm (A)	38	-2, -6	78	59	1,1
32/39 cavity 16 mm (A)	39	-1, -4	78	59	1,1
34/39 cavity 20 mm (A)	39	-4, -8	78	59	1,1
36/39 cavity 20 mm (A)	39	-3, -8	76	55	1,1
36/40 cavity 20 mm (A)	40	-1, -5	78	59	1,1
30/40 SZR 16 mm (A)	40	-2, -6	77	55	1,1
34/41 cavity 20 mm (A)	41	-2, -6	77	55	1,1

* U_g-Values for vertical glazing

technical introduction – noise and how it is measured [PDF]

General glazing guidelines [PDF]

2. Application notes

2.1 Definition and explanation of „Spectrum-weighting values“ C und C_tr

The „Spectrum-weighting values“ C und C_tr correct the values of noise reduction R_w: For noise sources with typically high frequencies, the value C must be added. For other noise sources, particularly those with lower frequencies, C_tr must be added R_w.

Both correcting values are always negative or equal to zero, i.e. they correct the noise reduction value downwards.

The acoustic behaviour of a building component is therefore given in the form R_w (C,C_tr). That means that a building component with the values R_w (C, C_tr) = 40 (-2, -8) indicates a „middle“ insulation value of 40 dB. Particularly for noise sources with high tones the noise insulation is 2 dB lower, and for deep frequency noise sources the even up to 8 dB.

2.2 Requirements of acoustic insulation

Normally, requirements are made of the building component of the window and not the glazing alone.

Typically the required acoustic performance of the glazing is always higher than the value desired for the installed window. It is the job of the architect or acoustic consultant to determine the design noise level and the performance requirements of acoustic insulation.

Airborne noise reduction [PDF]