SA Roofing September 2017 // Issue: 93 - Page 12

ADVERTORIAL: COVER STORY THE TOTAL ENVELOPE SOLUTION FROM A SINGLE SOURCE Product Focus / Rainscreen Facade Rainscreen Façades are cladding systems applied either during the initial construction of a new building or an over-cladding as part of refurbishment of an existing building. These systems provide an outer weather resistant decorative skin, fixed to a structure by means of a supporting grid, and maintain a cavity which is ventilated and drained, between itself and the primary structure. A ventilated rainscreen with insulation on the backing wall will allow the building fabric to breathe, without the risk of interstitial condensation or structural degradation. Rainscreen cladding allows the designer to create complex and interesting façades, with an economic load bearing structure. The need for complicated detailing and the risk of cold bridging is dramatically reduced. The Benefits The Façade rainscreen cladding system creates a completely flat surface giving the specifier the opportunity to develop an aesthetically pleasing façade, whilst providing long term performance. A multi-layered rainscreen cladding system will out-perform alternative types of construction at an economic whole life cost to the building owners. Façade rainscreen cladding systems provide a low maintenance, sustainable external ventilated ‘cold’ façade using aluminium sheet and other metals such as steel and copper, which are formed into cassettes available in a variety of horizontal and vertical joint arrangements, including 3-D geometric designs. Thermal Performance The thermal performance of a rainscreen cladding system is determined by the thickness of insulation included within the system itself or that of the internal wall structure. In refurbishment applications, the use of Façade rainscreen cladding system provides an ideal opportunity to upgrade the thermal performance of the existing building. A breather membrane is often used to protect the insulation from any moisture crossing the cavity, which will evaporate through rear ventilation action. The thickness of insulation required is dependent on the thermal performance of the insulation selected and required R-value. 10 SEPTEMBER 2017