The number of pages within the document is: 123
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Dr Richard Rudd (Aegis), Dr Ken Craig (Signal Science), Dr Martin Ganley (BRE), Richard Hartless (BR
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2019-02-08 22:49:59.274863
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EXECUTIVE SUMMARY 1.1 Motivation & background While building entry loss is an increasingly important parameter in link planning, it is poorly-characterised, partly due to the wide variability within and between buildings. Data relating to domestic buildings is particularly poorly represented. Ofcom have expressed concern that the increased use of energy-efficient construction practices may be causing building entry loss to increase, and this study was commissioned to address this question. 1.2 Review of building materials & practices There is a large proportion of older buildings in UK stock, with about 86% of current housing stock built before 1997. These properties tend to be upgraded gradually mainly in response to government initiatives, with the replacement of products such as windows or during major refurbishments, conversions or extensions. While there are general regional differences in construction method, London is something of an exception with higher levels of solid walls and single-glazed windows. New construction over the next decade is likely to represent less than 1% of total stock per year. A particular driver for improving the performance of houses has been the reduction in energy use. This has resulted in Government initiatives (e.g. Green Deal) and changes to the Building Regulations (Approved Document L) have been aimed at improving the thermal performance of houses. Although not specifically mandated by any regulations, some metallic coated materials have been specifically designed to improve the thermal performance of houses and help meet building regulations. However, their use can also affect the transmission of wireless signals into and within houses. Foil-backed plasterboard gives good thermal performance, acts as a vapour resistant layer and also has minimal impact on the room dimensions, .Insulation boards with an aluminimum coating on both faces are used in cavity walls and in roofs. Low emissivity (Low E) glazing improves the thermal performance of double-glazed windows by adding a thin metallic or metallic oxide layer to one of the glass panes. Until recently, there has been a gradual increase in the use of these building products . However, more recently, there appears to be a significant increase in the use of foilcoated products and also significant innovation in an array of new metallic products. For example, this includes “multi-foil” which may typically consist of more than ten layers of aluminium foil and insulation in a product which is highly flexible and which additionally may have improved fire properties. It is now common to see this product stapled to roof eaves and laid on loft floors. Ægis Systems Limited Bui
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