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RCI March 2018

INSULATION Project1_Layout 1 07/05/2013 OPerformance combined with key product characteristics Aluthermo RoofReflex breathable underlay membrane is a cost-saving top-up insulation from Novia. Adrian Chisholm, director of the company, explains more to RCI readers ne of the main challenges facing building envelope designers in today’s market is bringing together an everevolving set of construction products and building materials that will continually improve achieved U-values, yet keep within strict budget guidelines. Demands from all parts of the market are constantly forcing U-values lower and lower, requiring architects to consider new or alternative and innovative ways to meet the design criteria. However, meeting a particular price-point is still vitally important for many projects to remain viable. One way to cost-effectively improve the energy performance of a building is to increase the R-value of one of the existing components by adding some form of insulation to the component itself, thereby providing additional thermal benefits over and above that is normally achievable from a particular building element. Aluthermo RoofReflex is a CE-approved EN 13859 breathable underlay, which has been combined with an insulation layer to provide an additional thermal performance within insulated roof and wall designs of up to 1.47m2.K/W. The additional R-value benefits achieved will vary depending upon the particular application in which it is used. RoofReflex is installed within the building envelope on the cold side of the existing insulation system, as would be the case for a normal breathable underlay. The product still performs the core requirement of all external underlays, which is to provide a secondary protection barrier against a range of unwanted external environmental factors. However, due to the way in which RoofReflex has been combined with an insulation material, it also provides thermal benefits that are not available when using traditional underlay products. Aluthermo RoofReflex is manufactured from Novia’s high specification Reflex membrane, which is our CE-approved low-emissivity breathable membrane for roofs and walls. Reflex is laminated to a 37mm thick polyester insulation layer, which is produced from recycled plastic bottles, to make the final Aluthermo RoofReflex product. RoofReflex is manufactured by our insulation partner Aluthermo SA, based in Belgium. The product provides a core thermal resistance of 1.00m2.K/W, which is ideal for topping up other insulation systems. It also provides additional thermal resistance benefits of up to 0.47m2.K/W, by virtue of its low-emissivity surface. The same low-emissivity surface will also keep structures cooler in the summer months, plus 058 MARCH 2018 RCIMAG.COM the way that the product is installed minimises thermal bridging effects. The final thermal benefit is derived by designing the membrane to be fully airtight (air-impermeable), but still highly vapouropen, thereby providing an external air-leakage barrier. By keeping warm air in, and yet still allowing unwanted moisture to ventilate from the interstitial layer, RoofReflex maximises the buildings thermal performance. An airtight airleakage seal is further maintained by providing integral sealing tapes, for use at the overlaps. Aluthermo RoofReflex is a cost-effective add-on insulation product. For example, when installed in combination with other mineral wool insulation products, there are potential cost-savings of 40% to 50% available, when compared to equivalent PIR/PUR installations. As the product also comes with an EN 13501-1 fire classification rating of E, its combined use with mineral wool provides improved fire performance characteristics against some other insulation system designs. The reflective aspect of RoofReflex can help add up to 1.47 m2.K/W for minimal space in the roof and walls RoofReflex even significantly improves the overall acoustic performance of the build, as the recycled polyester insulation is a great sound attenuation material. Aluthermo SA has commissioned a detailed report, which will published this month, to test and analyse these acoustic benefits in detail, and to put them into context. The membrane has both LABC and EPC certification, and comes with a ten-year warranty by Allianz Insurance, as well as mandatory CE compliance to EN 13859-1 and EN 13859-2, which provides specifiers with all the confidence that they might need. As part of maintaining a high specification solution, the membrane also conforms to EN 1928 W1 water resistance. The product is supplied in 1.4m x 10m rolls, and is available from Novia, along with any installation accessory products that may be required. Architects and designers can easily specify Aluthermo RoofReflex via NBS software. www.novia.co.uk With tape pre-applied, installing RoofReflex is quick and easy, reducing time and costs on-site An internal roof view of the RoofReflex insulation, made from recycled material


RCI March 2018
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