 It could look like cedar shakes or slate. And I would make sure that I have very good roof ventilation because typically older homes that are that age don't have enough attic ventilation, and so the attic tends to overheat. That shortens the roof life. So what you would want to do is install a ridge vent down the peak of the roof from end to end to open that up and then couple that with soffit vents at the overhang so that 24-7, 365, you would have a washer of air in the soffit vents, under the roof sheathing, and out.