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CONSTRUCTION <br /> Ceiling framing section <br /> Interior air film 1. Air film 0.61 <br /> Wood ceiling 2 . Pine boards-3/4" 0.94 <br /> Framing materials 3. 3-1/2 inches soft wood 4.35 <br /> Insul, above framing 4. 6-1/2" fiberglass 19 <br /> Roof sheathing 6. Plywood 1/2" p <br /> Exterior air film 5. Air film 0. 17 <br /> Total R = 25.07 <br /> U = 1/R = 0.040 <br /> Ceiling section (Insulated) <br /> Interior air film 1. Air film 0.61 <br /> Wood ceiling 2. Pine boards-3/4" 0.94 <br /> Insulation 3. Fiberglass 3g <br /> Insulation, foam 4. inches p <br /> Roof sheathing 5, p <br /> Exterior air film 6. Air film 0.17 <br /> Total R = 39. 72 <br /> U = 1/R = 0.025 <br />