External timber frame walls - Effects of façade type, internal linings and construction details on measured sound insulation

In this paper we discuss the airborne sound insulation of timber frame walls with different ETICS (External Thermal Insulation Composite System) and ventilated Exterior Wooden Claddings, measured in the laboratory. The ETICS-Insulations were made of standard EPS, plasticize EPS with lower dynamic stiffness, Stone Wool and Wood Fiber Boards. The Exterior Wooden Claddings were made of overlapping larch planks and gaps between the planks, respectively. Beside the basic acoustic behaviour of the walls with different façade systems we investigated the effect of changes in the geometry of the supporting structure and of the internal linings. The internal linings were made of one and two layers of gypsum plasterboards or fibreboards. The boards itself were mounted directly on the wall studs, on additional timber laths or on resilient channels. Further more, the effects of complete decoupled dry linings were also investigated. All analyses are done including the lower frequency range, i.e. 50 Hz - 5000 Hz.