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How to Calculate Whole-Wall U-Factors | by Home Energy Magazine
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How to Calculate Whole-Wall U-Factors

Figure 1. The illustration shows a sample wall assembly

in which insulated siding helps meet or exceed the

2009 IECC for climate zones 1 through 8 with a U-factor

of .057. This illustration depicts a wood-framed wall

assembly with R-3.0 insulated siding, R-1.5 foam

sheathing, and R-15 cavity insulation.

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Taken on April 26, 2011