In roof and wall coating the parameters and calculation methods desired for acoustic insulation are determined during the stage of design. Part of the sound waves that fall on the surface is reflected, another part is absorbed and yet another is conducted. Reflexion, absorption and transmission levels depend on surface shape, the material’s acoustic absorption capacity and sound frequency.
SOUND TRANSMISSION LOSS VARIATION DEPENDING ON FREQUENCY (dB)
| Frequency (Hz) | |||||||||||||||||||
| 125 | 160 | 200 | 250 | 315 | 400 | 500 | 630 | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | 3150 | 4000 | 5000 | 6300 | 8000 | |
| 50 mm. | 7,3 | 9,3 | 11,7 | 8,5 | 11,4 | 12,3 | 13,3 | 14,1 | 14,7 | 15,9 | 15,3 | 11,5 | 11,8 | 23,4 | 29,2 | 32,4 | 29,8 | 32,5 | 36,9 |
| 60 mm. | 8,1 | 22,1 | 14,2 | 14,5 | 13,0 | 13,9 | 13,8 | 14,6 | 15,3 | 16,0 | 15,3 | 13,0 | 18,3 | 24,2 | 29,2 | 32,5 | 29,8 | 32,5 | 36,9 |
SOUND ABSORPTION COEFFICIENT VARIATION DEPENDING ON FREQUENCY (dB)
| Frequency (Hz) | ||||||||||||
| 315 | 400 | 500 | 630 | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | 3150 | 4000 | |
| 50 mm. | 0,08 | 0,11 | 0,22 | 0,2 | 0,05 | 0,59 | 0,09 | 0,11 | 0,04 | 0,07 |
0,18 |
0,07 |
| 60 mm. | 0,14 | 0,21 | 0,25 | 0,25 | 0,06 | 0,69 | 0,12 | 0,12 | 0,22 | 0,08 | 0,2 | 0,11 |
