Is It Time?How to Tell Your Roof Needs Replacing, Not Another Patch
Most asphalt roofs tell you they are done long before they fail outright. Look for shingles that cup at the edges or curl at the corners, granules piling up at the downspout outlets, and bare black mat showing on the slopes that take the most afternoon sun. Brittle tabs that crack when lifted, a dip between rafters and pinholes of daylight in the attic are the late signs. Age counts too. A three-tab roof past 18 to 20 years, or an architectural roof past 25, is living on borrowed time.
Roof Replacement is a big check to write, and the hard part is that bids rarely line up. One bid is a simple overlay, the next is a tear-off with new underlayment, and the third never mentions the decking at all. Those are not the same job, and the cheapest number is often missing the parts that keep a new roof dry for decades. Getting a contractor out who will explain what is actually in the scope is the whole point of the call.
The contractor you are routed to will usually start in the attic, not on the roof. From inside, they can see water staining on the sheathing, frost or mildew from poor ventilation, and how many nail layers poke through. That decides whether an overlay is even allowed, since most codes cap a roof at two layers, and how much sheathing may come out during tear-off.