Age, layers, the state of the deck and how localized the damage is. A framework for a decision usually made with too little information.
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Repair, cover or tear off: the decision that follows
Eventually the question stops being what is wrong and becomes what to do about it. That decision turns on the age of the roof and the number of layers far more than on the size of the damage.
The question is rarely whether the repair will hold
At some point the diagnosis is settled and a different question arrives: patch it, cover it, or take it off and start again. It is a genuinely difficult decision and it is usually made with poor information, so this section tries to give you the framework rather than the answer.
The first input is age, and most people do not know theirs. There are ways to establish it that do not involve guessing: the closing paperwork from when you bought the house, a permit record with the local building department, the manufacturer and product visible on a leftover bundle in the garage, sometimes a date written inside the attic by whoever did the work. Age matters more than the damage, because a good repair on a roof with fifteen years left is sensible and the same repair on a roof with two years left is money spent twice.
The second is how many layers are already up there. Going over the top of an existing roof — an overlay — is faster and avoids the disposal, and it comes with real costs: the new covering runs hotter and ages faster, nobody inspects the deck underneath for rot while it is hidden, flashing details are harder to do properly over a lump, and the weight adds up. Many jurisdictions cap the number of layers outright. If a roof has been overlaid once already, the decision is usually made for you.
The third is what is under the shingles. A tear-off is the only time anyone sees the deck, and soft or delaminated sheathing found at that point is a normal, expected finding rather than a disaster — but it is also the moment where a quote becomes a different number, so it is worth knowing that before it happens rather than on the day.
Finally, the people. A roof replacement is one of the larger transactions a household makes, and the parts of it you can check are permits, licensing, insurance, how the quote handles unknowns like deck repair, and whether the warranty is on the material, the workmanship, or both — because those are three different promises from three different parties.
We do not publish prices or ranges. Roofing costs vary by region, pitch, access, season and material to the point where a number written here would be worse than no number. What we can do is make sure you understand what you are being quoted for.
Repair or replace guides
Permits, closing documents, leftover materials, markings in the attic and what the roof itself is telling you.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.