Glass > Direct airborne sound resistance
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Principles
Direct airborne sound insulation is the ability of a curtain wall to acoustically insulate the interior from direct airborne external noise. The sound insulation index should be determined by test in accordance with EN 12758. The test results shall be determined in accordance with EN 717-1.
Standards
| EN 717-1 | Acoustics – Rating of sound insulation in buildings and of building elements – Part 1: Airborne sound insulation |
| EN 12758 | Glass in building — Glazing and airborne sound insulation — Product descriptions and determination of properties |
Method of test
Direct airborne sound insulation is measured by mounting the test sample in an opening between two rooms and measuring the sound insulation at different frequencies.
Classification
There is no classification for direct airborne sound resistance. Where required the Rw Index and corresponding spectrum adaptation terms, C and Ctr in the form Rw(C, Ctr). The values should be declared in units of dB.
CE Marking
UK Regulations do not cover noise from outside the building and therefore the direct airborne sound insulation is not required for the curtain wall. The allowable use of No Performance Determined (npd) is as follows:
| Location | npd allowed |
| England and Wales | Yes |
| Scotland | Yes |
| Northern Ireland | Yes |