yup dryvit. another thing you'll see on older homes is gypsum sheathing . Most don't have tar paper. Especially aluminum siding before 1980. The walls usually are fir'd out w 3/4 or 5/4 x 2. doesn't take much to crease it while DS even with low pressure. Basically hollow siding. Hardly ever replaced old siding where the gypsum sheathing didn't have lots of holes or cracks.