Conventions for U-valuecalculations - BRE
3.6 Gypsum plasterboard 5 3.7 Structural timber 5 3.8 Metals and alloys 5 3.9 Thermal conductivity of other materials 6 3.10 Reflective foil products 6 3.10.1 Bubble sheet with aluminium foil facing 6 3.10.2 Multi-foil insulation 6 4 Issues concerned with U-value calculations 7 4.1 Surface resistance 7 4.2 Mortar joints in masonry construction 7
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www.bre.co.uk5 Elements adjacent to an unheated space 18 6Expression of results 18 7U-values for walls 19 8 U-values for roofs 21 9U-values for floors 23 9.1 Slab-on-ground floor (ground-bearing floor slabs) 23
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