Roof repair or full replacement? Age, damage pattern, and decking condition decide it. Here is how to read your roof and get both numbers in writing.
This is the decision where homeowners get pushed hardest. Almost always toward the bigger number, and quickly. It's also a decision with a genuinely clear answer most of the time, once you look at three things. Age, the pattern of the damage, and the condition of the decking underneath. A roof with one damaged section and plenty of service life left is a repair. Full stop, no debate. A roof losing granules on multiple slopes, with leaks appearing in different places, is telling you something else. The middle ground is smaller than most people expect, which is actually good news for you. What makes this decision hard isn't usually the technical question. It's that you're spending serious money based on someone else's description of a surface you can't see. So the useful move is to understand what drives the answer. Then insist on both numbers in writing before deciding anything.
A roof in the first two thirds of its service life with damage in one area is a repair. A few shingles lifted by wind. A cracked boot at a plumbing vent. Failed step flashing at a sidewall or chimney. Those are localized problems with localized fixes. Most leaks come from flashing and penetrations rather than from the field of shingles. That's why a roof can leak at fifteen years and still have plenty of life left in it. Replacing a whole roof to fix a flashing detail is an expensive way to solve a cheap problem. Ask what specifically failed. A good roofing contractor will show you.
The signals are cumulative. Widespread granule loss, with granules collecting in the gutters. Curling or cupping on multiple slopes rather than one exposed area. Shingles that no longer hold fasteners. Multiple leaks in different locations over a short period. Three separate repairs in five years. Any one of those alone might not decide it, and a good contractor will say so. Together they say the material is done. Continuing to patch means spending money on a surface failing everywhere at once. Age matters here too, assessed properly rather than guessed at from the driveway. Ask how they arrived at the number.
This is the part nobody can assess from the ground. Under the shingles is the plywood deck, and its condition often decides the whole question. If water has been getting in for years, sections of that deck are soft. Soft plywood is not a small detail. A repair over soft decking doesn't hold fasteners properly and fails again. That's also why layering new shingles over old is a bad idea. It hides the deck entirely and adds weight the structure wasn't designed for. A tear off is the only way to actually see what you're dealing with. That's why it belongs in the scope of any serious home project.
Ask for the repair cost and the replacement cost side by side, in writing, on the same page. Any contractor confident in their own recommendation will hand you both without being pushed. If someone quotes replacement without evaluating repair, that's information about the contractor rather than about your roof. Ask what they found in the attic, not just on the surface. A proper inspection always includes both views. And ask what happens to the decking during tear off. The answer tells you a great deal about how the job will actually be run. Vague answers there are a warning sign worth taking seriously.
Age alone doesn't decide it. Asphalt shingles have a typical range, but ventilation, sun exposure, and installation quality change the outcome significantly. A well ventilated roof outlasts a poorly ventilated one on the same street.
Some towns allow it, but it's rarely a good idea. It hides the decking, adds weight, and traps heat, which shortens the life of the new layer. It also makes the eventual tear off more expensive.
Not necessarily. Water travels along framing before it drops, so the stain is rarely below the entry point. The source is often flashing or an ice dam, both of which can be addressed without a full replacement.
An average residential replacement runs one to three days, depending on size, pitch, and how much decking needs replacing. Work should be scheduled around the forecast so the deck is never left open.
Most towns require one for a full replacement, and many want to inspect the decking before new material covers it. Small repairs usually don't. Requirements come from your town rather than the state.
Send us photos of the roof or the ceiling stain. We provide the repair and replacement numbers side by side.
