An insulated wall is constructed of 716 in hardboard lapped siding, 12 in OSB sheathing, 512 in

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An insulated wall is constructed of 7⁄16 in hardboard lapped siding, 1⁄2 in OSB sheathing, 51⁄2 in fiberglass batt insulation, a vapor retarder (plastic film), and 1⁄2 in gypsum board. The wall is framed with 2 × 6 solid softwood lumber at 24 in OC. Calculate the whole-wall U-factor for this construction assembly under winter conditions.

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