Abstract
In principle, the new Dutch code (NEN-1070, December 1962) is closely related to the German one as far as airborne and impact sound insulation is concerned. A simplification is that requirements are formulated for four octave bands only. On the other hand, an additional requirement is included, which restricts unfavourable deviations from the standard values. The decision to conform more or less with the German code was based on the results of an analysis of radio programmes. A survey of this work is given. Sound insulation requirements in the Dutch code relate to the sound insulation between two rooms in adjacent dwellings, not to the sound insulation of walls or floors as such. This means that flanking transmission has to be taken into account. Some directives in this respect are incorporated in the code. Apart from sound insulation, requirements are formulated for a number of other possible noise sources, as, for example, the reverberation in staircase halls, sanitary installations, slamming doors, etc. These have been viewed partly from quantitative and partly from qualitative standpoints.
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