Structurae

Loss factor correction for hollow bricks filled with insulation material
The acoustic properties of hollow bricks filled with insulation material were systematically investigated in a joint research project by the University of Applied Sciences in Stuttgart and the Fraunhofer Institute for Building Physics. The findings showed that the acoustic performance of filled bricks differs only slightly from that of non-filled bricks. The main difference is greater inner damping and a resulting increase in sound insulation of about 1 to 2 dB compared to non-filled bricks of the same type. Based on the results of the investigation a modified procedure for the loss factor correction of the sound insulation of vertically perforated hollow brick masonry was developed, which applies equally to filled as well as non-filled bricks.