Abstract
The use of single number rating (grade index) is regarded as an approximate approach to the estimation of the sound insulation performance of building elements in the laboratory as well as in the field. Differences of weighted sound pressure levels have been more often considered as quantitative measures in simplified methods for measuring sound insulation in buildings. Most of the usual studies on a simplified method have been initiated using the relationship of differences of weighted sound pressure levels and the grade index, a relationship which can be obtained from a large amount of data on the sound insulation of building elements by using a statistical method. General expressions are mathematically derived in this paper for the maximum differences between the grade index and differences of weighted sound pressure levels. The results indicate that the difference between a C-weighted source level and an A-weighted receiving level has been found to give the best correlation with the grade index D w when a flat source spectrum is used.
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