After completing the initial blower door test, two inches of exterior insulation are added to the building’s exterior. In addition to improving the wall’s thermal performance, the foam is necessary to ensure the wall assembly avoids condensation and moisture problems within the wall cavity. Outside of the insulation, furring strips are applied, which allows air to circulate behind the siding and ensures bulk moisture is not trapped against the sheathing. With the furring strips installed, air can move freely from the bottom of the wall assembly to a vent under the parapet cap.
On the interior, an additional building envelope detail includes applying Intello-brand smart vapor retarder to the interior of the basement wall.