If you need an old roof replaced, choose The Roof Detective for roof replacement in Lewis Center, OH. The best approach is to replace a roof as the material nears its expected life span. If you have a 30-year shingle, opt for roof installation before or during the 30th year. Trying to squeeze more life out of an old roof essentially amounts to waiting for it to fail. If water intrusion occurs, you can end up spending a lot more to fix sheathing and other structural elements.