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We do not publish prices or ranges.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.
The rating on the wrapper is a lab result. Ventilation, layers, sun exposure and installation decide the real number.
What the inspection actually checks, what an unpermitted roof leaves you without, and how to confirm one was filed.
A material warranty and a workmanship warranty cover different failures, from different parties, and both can leave you exposed.
A steep slope decides what materials can go on it, how it drains, and why walking it yourself is the wrong move.
No single missing shingle means replace the roof. What to check from the ground, the eave and the attic, and how many signs it takes.
A roofer's written opinion on condition and remaining life, requested at closing. Not a permit, and not a guarantee.
Both panels carry the roof. Moisture, not the label, decides which one fails first, and you can check it from the attic.
A ladder gets your eyes to the eave. How to set one up for a look, and why this site never tells you to climb onto the roof.
A written scope, a license you can look up and a named permit plan tell you more than the lowest bid.
Most of an inspection happens from the ground, the eave and the attic. A checklist that never asks you onto the roof.
Typical lifespans for asphalt, metal, tile, slate and wood, and the conditions that cut each one short.
A new layer over the old one hides the deck. When it can work, when it cannot, and what to ask first.
Commonly quoted at 40 to 70 years, but the washers, seams and flashing usually give out before the panel.
A reflective coating extends a sound roof. It does not fix a wet deck or an open seam.
Find the spot, limit the water, and give a roofer a clear scope. Why we skip the on-roof steps.
Seams, drains, pipes and ponding: how to narrow the cause without stepping onto the roof.
The underlayment does the sealing. How to read the signs without stepping on a tile.
Rise over run, the four main ranges, and how pitch affects leaks and who can safely work up there.
Natural stone on nails and flashing: what fails first and how to read it from the ground.
Wave, R-panel and standing seam: how each sheds water and where the leaks start.
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.