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CEILING WITH VENTED ATTIC S 'i ,t. /WOVE,' <br /> R VALUE R VALUE <br /> FRAMING CEILING <br /> ./------7>- --' • <br /> 0.61 Air Film 0.61 <br /> • <br /> 36.00 Insulation 44-00 <br /> • <br /> 1104116• 4-38 :::ng <br /> .56 . <br /> 0.61 Air Film 0.61 <br /> /.>"-\ . <br /> 41.55 Total R '45.78 <br /> .024 tU = 1 .021 <br /> • <br /> • <br /> CATHEDRAL CEILING <br /> • <br /> R VALUE •R VALUE <br /> FRAMING CEILING <br /> o —. <br /> i [kin,' 1Ioi ililllIQiil Ill] <br /> •• 11 0.61 ..-.: Inside .air film . 0.61 <br /> Ar -56 Ceiling�S .56. <br /> 14.375 Joistpacer) <br /> A --- Insulation 33.85 <br /> --- Air Space -50 <br /> .67 Roof decking .67 <br /> -06 Felt .06 <br /> .44 Shingle -44 <br /> 0.17 Outside air film 0.17 • <br /> 16.88 Total R 36.86 <br /> .059 R = U .027 <br /> Window infiltration .5 cfm/lineal foot of crack <br /> Residential door infiltration 0.5 cfm/square foot or door and minimum code requirement , <br /> Non-residential door infiltration 11.0 cfm/lineal foot of crack <br /> Ub 12" concrete block no insulation = .781 R 1.28 <br /> double glass = .52 <br /> triple glass = .31 <br /> • <br /> All exterior walls and ceilings must have a vapor barrier (0.10) perm max.). <br /> Vapor barrier must be on the inside (heated side) of wall. <br /> Vapor bariers of the polyethelene thin film have no R value. <br />