An insulated wall is constructed of 716 in hardboard lapped siding, 34 in foil-faced (both sides) polyisocyanurate

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An insulated wall is constructed of 7⁄16 in hardboard lapped siding, 3⁄4 in foil-faced (both sides) polyisocyanurate insulation board sheathing, 31⁄2 in cellulose insulation, a vapor retarder (plastic film), and 1⁄2 in gypsum board.
a. Determine the Rt-value and U-factor for this construction assembly under winter conditions.
b. Determine the Rt-value and U-factor for this construction assembly under summer conditions.

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