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Building Products April 2017

INSULATION AND ACOUSTICS can provide a long-term, low maintenance solution to this issue. In Scotland, for example, one of the scheduled measures is the installation of insulation within the roof space. This applies if any accessible roof area with a U-value of 1.0W/m²K or worse. In these cases, the thermal performance of the roof areas must be improved to a U-value of at least 0.15W/m²K. Another increasingly popular option is the installation of solid wall insulation. For properties with solid walls, the only wall insulation options are External Wall Insulation (EWI) or Internal Wall Insulation (IWI) applications. Whilst EWI applications are far more common than IWI, there are some scenarios where IWI may be the only option or the most desirable one. Typically, this occurs when properties are subjected to additional planning restrictions, either because they are listed or situated within one of the thousands of conservation areas across Britain. In some cases, owners may also want to avoid EWI applications as they wish to retain the original aesthetic of the property. In addition to removing the need for external changes to a property, IWI applications can also make homes more responsive to heating systems. This is because the heat is retained directly within the room, rather than being stored in the walls (which gives longer heat retention but also takes longer to heat up). 34 BUILDING PRODUCTS | APRIL 2017 As such, it can provide a more effective solution for heating individual rooms. This may be helpful for people living in fuel poverty, who can only afford to heat whichever room they are occupying. Obviously, IWI applications will have an impact on living space within the property. It is, therefore, critical to find insulation products with the lowest lambda value (thermal conductivity). The lower the lambda value of the insulation layer, the more effective it is at preventing heat transfer through conduction. As a result, this allows installers to achieve the best possible thermal performance with a minimal thickness of insulation. Take a typical solid wall construction with 102.5mm brickwork where the original plasterboard has been stripped back and timber battens fitted at 600mm centres. In this application, a 112.5mm thickness of insulated plasterboard with a thermal conductivity of 0.018 W/m²K is all that is required to achieve an external wall U-value of 0.17 W/m²K. This creates a warmer, healthier environment for occupants, whilst retaining as much living space as possible. When installing insulation internally, it is crucial to carefully plan out the work, paying close attention to areas such as junctions around doors, windows, floors and ceilings. Further information about correct detailing can typically be obtained from the insulation manufacturer. The issue of detailing was a key focus within the recently published Bonfield Review, which has recommended the introduction of a quality mark for all companies working within the energy efficiency field. With central and regional governments committed to further reducing carbon emissions, the task of addressing the performance of our existing built environment is only likely to grow in importance over the coming years. By embracing top performing insulation materials as part of a wider solution, specifiers can help to improve energy performance and reduce carbon emissions from both domestic and nondomestic properties, without compromising space or comfort. Adrian Pargeter is Head of Technical and Product Development at Kingspan Insulation <<< Continued from page 33


Building Products April 2017
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