If your home's asphalt shingle roof is aging but you are not sure how to tell when the need for a replacement is imminent, then check for these common signs of a failing roof:
One of the first signs of an aging asphalt shingle roof is deformed shingles. If you can see shingles that are curling, buckling, or otherwise deformed, then it is time to have a professional roofer take a look.
Missing or Broken Shingles
As asphalt shingles age in the hot sun, they will eventually wear out and break off when it's windy. If you find shingles or their nails lying in your yard, then your roof is definitely wearing out.
When asphalt shingles are aging, the small asphalt granules on their surface wear and will wash off when it rains. You can check for granule loss by looking for small particles under your rain gutter system's downspouts.
As the shingles shed off most of their granules, the roof will have a look that is a more uniform color. If your roof looks lighter or doesn't seem to have the same look that it used to, then this is a big sign of excessive wear and the need for roof repair.
When you stand in your driveway and look up at your roof, do you see areas that sag or where you can easily see where each sheet of plywood is installed under the shingles? If so, this sagging is a sign that the roof has been leaking and the underlayment needs replacement.
Rusted or Missing Flashing
Areas where your roof meets a chimney, vents, or other structures, it should have small pieces of metal that are caulked into place. These metal pieces are called flashing and the flashing's purpose is to keep water from getting under the asphalt shingles in areas where it contacts other types of surfaces. If the flashing on your roof is rusted or missing, then your roof may be leaking.
Neighbors are Replacing Their Home's Roofs
Finally, if it seems like your neighbors are frequently getting new roofs put on their own homes, then this is a sure sign that the original roofs put on when the homes were built are coming to the natural end of their useful life. If this is the case, or if you see any of the other signs listed above, then you should contact a licensed roofing professional and have your roof inspected.