We don't have many brick homes around here in central Vermont. I recently visited a one-story ranch home that was built with exterior walls of hollow core CMUs (concrete masonry units), a brick exterior and a sheetrocked interior that is strapped to the CMUs, which are filled with vermiculite insulation. I am looking for advice from auditors who have experience with this type of construction. Would you feel comfortable doing a BDT (blower door test) that depressurizes the house? What concerns would you have about this?