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40. <br /> CONSTRUCTION R VALUC- <br /> CEILING SECTION (INSULATED) : <br /> 1' Interior air film 0.F-1 <br /> 2 <br /> 30.AI <br /> 3 4 4 Exterior air film (still) <br /> TOTAL R = <br /> U = 1/R = <br /> / CEILING FRAMING SECTION: O.FI <br /> 2 5 1 Interior air film <br /> 2 <br /> AIR VENTED 4 Interior air film still O. 1 <br /> FLOW 5 inches soft woof <br /> TOTAL R a <br /> U i/R = <br /> CEIL114G SECTION (INSULATED) : Q.F1 <br /> 1' Interior air film <br /> 4 Exterior air film still 0.01 <br /> TOTAL• R = 3-)-1 pv <br /> U a 1/R = -a��J <br /> 2 3 4 5 CEILING, FRAMItIG SECTION: <br /> 1 Interior air film o.61 <br /> 2 h/P." �t �.v ul <br /> VENTED 3 <br /> 4 Exterior air film stile <br /> 5 'j) ,_ Inches soft wood <br /> TOTAL R = 3 <br /> U <br /> 4 5 <br /> �•"'��•�:::/•�� �• .•� <br /> Inside aIr film O•(,l <br /> 4 <br /> S Outside air film 171• 17 <br /> 2 TOTAL R = <br /> U = 1/R = <br /> 18 <br />