Haunted It Is!
1. The exterior "skin" of your house consists of:
B. The roof, chimney and front yard.
My goodness, you must not have read any of the introductory training material or you wouldn't have chosen this slap-dash answer! The exterior "skin" of a house, or weather envelope, typically includes all the surfaces of its functional and decorative features--roof, chimney, exterior walls, woodwork, windows, porches, doors, and the foundation walls. This skin serves as the primary defense against the potentially damaging effects of sun, rain, snow, ice and wind. So taking care of the outside of a house and all those interconnecting surfaces between parts is of critical importance. Simply, it's how you preserve the historic character. If the "skin" is not properly maintained and repaired, you may have to replace an entire feature, and at great expense!
Don't eat crow on the next question...