Flankenübertragung von Hochlochziegelmauerwerk mit Leichtbau‐Trennwänden.

Flanking sound transmission of highly insulated hollow clay bricks with a light framed gypsum board separating wall Understanding flanking sound transmission along exterior walls is important to ensure an appropriate sound insulation between dwellings. The flanking sound transmission in massive construction is determined by the direct sound reduction index of the single elements and the vibration reduction index of the junction. For cases constructed with a separating wall of light framed gypsum board, the junction attenuation can be quite low. Therefore, a closer look was taken at the flanking sound transmission along an outer wall constructed of hollow clay bricks, where the separating element was a light framed gypsum board wall. The effect of modifications of this T‐junction on the junction vibration reduction index was determined in the flanking facility of the Stuttgart University of Applied Sciences. For the standard butted T‐junction, the velocity level along the outer wall – outer wall path stays constant. This suggests the use of the minimum value of the vibration reduction index Kij,min. Modifications of the junction, such as introducing joints and blocking masses, can increase the junction attenuation significantly. It is also shown that reducing the length of the outer walls, to simulate windows and doors as found in the real world, increases the normalized flanking level difference. Note, that these "reduced" measurements, although more realistic, over predict the flanking attenuation relative to the standard measurement method. [ABSTRACT FROM AUTHOR]