Abstract
<jats:p>In modern buildings, lightweight double partition walls and glazed façades are being increasingly used. This is due to trends in contemporary architectural thinking, the wide variety of building products and materials available, and the drive to implement new design solutions. Another key trend is the establishment of increasingly precise standards for sound insulation, as well as methods to ensure acoustic comfort in the spaces of residential and public buildings. In this context, suitable construction solutions are being refined to meet building physics requirements. Nevertheless, some modern constructions exhibit shortcomings that reduce sound insulation and lead to undesirable effects. To study the influence of sound propagation in the air cavity and sound transmission through ventilation openings in double glazed façades, a plywood model was developed. This made it possible to investigate certain factors affecting longitudinal sound insulation in double constructions, such as the width of the air cavity (ranging from 20 cm to 120 cm) and the size and location of the ventilation openings. Conclusions and recommendations are made for improving the acoustic performance of double constructions. Similar effects occur not only in glazed façades, but also in lightweight partition walls, suspended ceilings, raised floors, wall linings, and other elements, where accounting for the complex influence of flanking transmission paths requires various acoustic studies. This research can provide guidance on future directions for building physics investigations of double constructions.</jats:p>