Part 1: Architect’s Guide 1 - 35 Frame AXIS Internal side of external skin SLAB 6 2 4 1 3 5 7 Frame AXIS Internal side of external skin 4 2 SLAB 8 1 3 6 Detail for bottom of infill walls Detail for top of infill walls A Slab 1 Gypsum board 5 Screw B Frame axis 2 Light steel gauge rail 6 Steel frame C Ventilated air layer 3 Light steel gauge post 7 Air barrier D Internal side of external skin 4 Hole for services 8 Joint treatment Figure 5.6 Infill walls 5.1.4 Thermal and acoustic elements Thanks to the two insulation layers, it is possible to vary the type (mineral wool, polyurethane, cellular glass) and the thickness of materials used and thus to eliminate a substantial amount of thermal bridging. The risk of direct heat transfer (cold bridging) must be treated at the level of the fixings and joints between the metal parts which are in contact with internal spaces and external areas. Acoustic performance also depends on the system and fixing of the external cladding and the insulation density. To improve comfort, the internal finish facing material can also consist of perforated metal sheets (see Figure 5.4), allowing the mineral wool insulation material in the façade to correct the acoustic performance through atmospheric absorption at a high sound pressure level. Lightweight façade solutions using steel structures are ideally suited to new construction and also to refurbishment and in particular to upward building extensions. University of technology, Rzeszow (Poland) Residential building (Denmark) Figure 5.7 Refurbishment and extensions
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