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CALCULATIONS OF AREA WEIGHTED ‘U’ VALUES For …
www.firstinarchitecture.co.ukAREA WEIGHTED COMPARISIONS OF 'U' VALUES Minimum Required Area weighted 'U' value for a extension that is of the same size and shape of the new extention ** See FIG 1 Element U' value Area m2 W/m2 Ground bearing slab 0.22 21.44 4.7168 Solid wall 0.28 34.90 9.772 Flat roof 0.18 24.70 4.446 Glazing ** 1.80 11.41 20.538 Total 39.4728 Sum of 'U' x ...