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� � � � ( � <br /> Cascadc Place 21 May 04 <br /> WALLS <br /> Wall T e 1 Standard <br /> 8" CMU, 2x4 metal Framin <br /> Com onent Descri tion RC RF <br /> Air fiim, exterior 0.17 0.17 <br /> CMU, 8", em t 1.65 1.65 <br /> Metal framin , 24" O.C. R-15, 2x4 7.80 7.80 <br /> G sum wallboard sheetroc�, 5/8" 0.50 0.50 <br /> Air film, interior 0.68 0.68 <br /> Total 10.80 10.80 I <br /> U-Vaiue = 0.77 / 10.80 + 0.23 / 10.80 = 0.093 <br /> Units & Abbreviations <br /> RC: R-Value at Cavity <br /> RF: R-Value at Framing <br /> R-Value: °F • sq.ft. • hr/ btu <br /> U-Value: btu /°F • sq.ft. • lir <br /> 3��, <br />