Another key factor in determining if you need to replace your roof is the age of that roof. This isn’t a warning sign you can see at times, but it’s worth keeping in mind. Roofs that are at least 20 years old may benefit from replacement with higher quality materials. Typical asphalt shingles last about that long, according to the National Association of Home Builders.
Other materials may last longer, however. Slate, copper and clay/concrete roofs can last over 50 years and wood shake roofs can last around 30, for instance. So, depending on what material you have on your roof and the last time it was replaced, it could just be time so that you avoid leaks down the road.