Various forms of constructions based on studs, mineral wall and boards have been developed in which some insulation is placed external to the frame and some between the studs. In this Section of the Development of Dry Composite Construction Systems Based on Steel in Residential Applications report from the European Coal and Steel Community (ECSC) different walls have been studied regarding thermal and hygrothermal properties as well as airborne sound insulation. The heat resistance calculations have been performed with different methods which have given the opportunity to compare 2D and 3D calculations. The effects of cold-bridging for heat transfer and condensation risk have been analysed. The studies have resulted in design recommendations regarding thermal bridging, hygrothermal functionality and acoustic performance.

A very effective way to reduce thermal bridging is to use thermal studs with elongated slotted holes in the web. However, this strongly affects the strength of the stud. A new type of thermal stud with smaller but more holes have been studied in a series of tests with normal and transverse loading on wall elements. The tests results have been compared with accurate calculations considering seven different failure modes. Also different methods of connecting the ends are studied, regarding the local effects on the studs. A special composite steel and gypsum board have been developed and studied regarding acoustical properties, thermal properties and strength. The composite board can be used as an easy-to-erect, internal cladding on the outer wall.

This document is excerpted from the report on the ECSC STEEL RTD PROGRAMME, Development of Dry Composite Construction Systems Based on Steel in Residential Applications, a project carried out with a financial grant of the European Coal and Steel Community. Participating countries involved in this study are: Sweden, Finland, the United Kingdom, Belgium and Germany.

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