But not on the roof. A roof beginning to show signs of wear needs attention. Wait too long to replace it, and a roof near the end of its useful life can develop widespread leaks that cause extensive damage. The timing can be tricky even when you know what to look for.
Safety comes first A close look always provides the best information.
But you have to measure that benefit against the risks of climbing around on a sloped roof. Flat roofs should not be a problem if you can get to them safely. The same goes for most low-slope roofs that are walkable. That means you can move around on the surface without scaffolding. In all cases, you should stay off a roof that is wet, and wear shoes with non-slip soles even on a dry roof.