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Here is a pic of our exterior remodel, or at least the insulation layers. On the front is the 2.5 lb per cubic foot, 3 inch thick polyurethane spray foam in the stud cavity, and on the side you can see the 1 inch foam decking that is covering the spray foam. Overkill perhaps, but there are health issues in the house with mildew, which drove this solution. The foam contractors also installed a plug of foam above the wall header at the eves, and filed the joust cavity in the basement where the house meets the foundation. There is a fresh or make up air inlet in the basement with a sealing air valve that opens on air pressure. The furnace gas solenoid also drives a relay, turning on a small (80 CFM) exhaust fan insuring fresh air in the house in the winter. My heating bill would be lower If I had a high efficiency furnace, but I don't. The furnace is original 1963 equipment and in good shape. High efficiency furnace without good insulation just efficiently wastes heat.
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