With people from different regions on this board I see differing construction methods used in residential building. In my region (MA) standard drywall is less common and skimcoat plaster is used. Our ceiling material is not secured directly to ceiling joists but to 3/4 inch furring strips (strapping)that are attached perpendicular to the joists. This makes it easier to fish wiring if needed at later dates. Most houses have basements where the service equipment is located. I have never seen a service panel installed on the outside of a house! What are some of the differences where you are?