An insulated wall is constructed of 11 mm hardboard lapped siding, 19 mm extruded polystyrene insulation board sheathing, 89 mm fiberglass batt insulation, a vapor retarder (plastic film), and 13 mm gypsum wallboard.
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.