ABSTRACT
The study consists in determining the impact of projecting facing brickwork on thermal inertia and Sound Transmission Loss (STL) of walls. Specific 3D thermal and acoustic calculation methods have been developed in order to determine the areal heat capacities and STL of walls with non-coplanar faces. An optimization process was carried out to determine the arrangements of projecting bricks allowing a maximum areal heat capacity to be obtained. This approach led to the definition of a wall, called “S”, for which the areal heat capacity is significantly increased compared to the reference wall with coplanar faces, with an almost constant areal mass. The structural modification of the wall is no longer consistent with the acoustic mass law. This change improves significantly the STL at low frequencies, however it degrades at medium and high frequencies compared to the 22 cm thick reference wall.
