Differences of sound insulation as tested in laboratory and in-situ conditions for corporate office construction system

Acoustic insulation, acoustic conditioning, and noise control, when combined, are fundamental to perceived sound quality and to the suitability of environments for their designated functions. These concepts also apply to acoustic projects for offices, where occupants expect acoustical comfort and speech privacy. This study compares the results of field measurements in a built office with laboratory tests for the systems adopted in the project. It also evaluates compliance with design criteria and project expectations. The field tests followed ASTM and ISO standards, depending on the case. Evaluating the occupants' perception of privacy and comfort was an important aspect of this research. This allowed for a broad view from the design methods to the post-construction results. The differences evaluated between the laboratory and the field are significant, particularly for glass partitions and doors. This difference can be greater than 9 dB in some situations. We could not relate the differences found exclusively to installation failures, and we recommend reviewing the laboratory test procedures. The present research might help in making decisions at the design and construction stage, and in the testing and manufacturing process.