by Andrew Goodrick
The most common question I get standing in a driveway is some version of "can you just fix it, or do I need a whole new roof?" And the honest answer is that it depends on three things, none of which is how bad the ceiling stain looks.
The three questions
First: how old is the roof? An asphalt shingle roof in Georgia has a realistic working life of somewhere around 15 to 25 years depending on the shingle, the attic ventilation, and how much sun and weather it takes. Age is the single biggest factor in the repair-versus-replace call, and it cuts both ways. A five-year-old roof with wind damage on one slope? Repair it, almost always. A 22-year-old roof with a leak at the chimney? I can fix that leak, and I'll tell you up front that I'm patching one hole in a boat that's taking on water in four other places. Sometimes that's still the right move — you're selling next year, or the budget says so. But you should be making that decision with the age on the table, not just the leak.
Second: is the problem local or systemic? This is what an inspection actually sorts out. A few shingles lifted by wind, a failed pipe boot, flashing that's pulled away from a chimney — those are local problems with local fixes, and repairing them is money well spent. Shingles losing granules across the whole roof, edges curling in the sun, multiple slopes showing wear at the same time — that's the roof itself aging out, and every repair from that point on is rent, not equity. The difference is usually obvious from on top of the roof and almost impossible to judge from the ground, which is why I don't quote repair-or-replace over the phone.
Third: what's the repair actually going to cost against the replacement? There's a rough rule I use: when a repair starts running past a quarter or so of what a replacement would cost, and the roof is in the back half of its life, the math starts favoring replacement — because you're likely to spend that repair money again, and again, and still end up buying the new roof. On a young roof, the same repair bill is an easy yes. Same dollar figure, different answer, and the roof's age is what changes it.
Things that don't fit the three questions
A second layer of shingles over the old ones is legal in a lot of cases and I still talk people out of it. It hides the deck, adds weight, shortens the life of the new layer, and makes the eventual tear-off cost more. If the roof is far enough gone that you're considering it, it's far enough gone to do it right.
A repair done well should disappear. If a contractor's repair plan involves visible mismatched patches on the front slope of your house, ask why. Matching isn't always perfect — shingle colors weather and get discontinued — but there's a difference between an honest color variance and lazy work.
And no, you don't owe anybody a replacement just because they climbed up there. I do inspections where the answer is "your roof is fine, call me in five years." That costs me a sale and it's still the right answer.
Where I fit in
I own Onsite Roofing here in Cherokee County and the repair-versus-replace conversation is most of what I do — inspections first, then a straight answer about which side of the line your roof is on. If somebody gives you the answer before they've been on the roof, get a second opinion.