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How long does a roof last, and how to tell how old yours is
An asphalt shingle roof, the kind on most American houses, lasts about 20 years for basic three tab shingles and about 30 for thicker architectural ones. Metal, slate and tile last much longer. Knowing which roof you have and the year it went on tells you whether to budget for a new one now or in a decade.
How long each type of roof lasts
| Roof covering | Typical life | Notes |
|---|---|---|
| Asphalt shingles, three tab | About 20 years | Flat, single layer shingles. Common on houses roofed before the 2000s. |
| Asphalt shingles, architectural | About 30 years | Thicker, layered shingles that look dimensional. Most new shingle roofs. |
| Wood shakes or shingles | About 25 years | Shorter in damp, shaded spots where moss holds water. |
| Metal (standing seam or panels) | 40 to 80 years | Fasteners and sealant on exposed fastener panels need care sooner. |
| Slate | 60 to 150 years | The slate outlasts the nails and flashing, which get replaced along the way. |
| Clay or concrete tile | 100 years or more | Individual tiles crack and are swapped; the underlayment below wears out first. |
| Flat roof: EPDM rubber | 15 to 25 years | Common on porches, additions and triple deckers. |
| Flat roof: modified bitumen or built up | 20 to 30 years | Seams and flashing are where leaks start. |
Ranges from the InterNACHI standard estimated life expectancy chart. Climate, attic ventilation and how well the roof was installed move a roof up or down the range.
How to find out how old your roof is
A roof rarely carries its date in plain sight, so the age comes from paper. In order of how reliable they are:
- The building permit. Most towns require a permit to replace a roof. The building department, often online, lists permits by address with the date and the contractor.
- The closing papers. The seller disclosure and the home inspection report from when you bought usually state the roof age or the year it was replaced.
- Receipts and the warranty. A roofing contract or a shingle warranty registration names the date and the product line.
- The attic. Leftover shingle bundles stored in the attic or garage often carry the product name and a manufacturing code. Some roofers write the date on a rafter.
- Ask the neighbors. On streets where houses were built together, the neighbor who remembers when the crews came is often right within a year or two.
If none of these turns up a date, have a roofer or home inspector look. They judge age from wear and the shingle style, and can tell you how many years are left even when the install year is unknown.
Signs a roof is near the end
- Shingles that curl at the edges, cup in the middle or crack.
- Bare patches where the granules are gone, and granules collecting in the gutters and at the bottom of downspouts.
- Missing shingles after ordinary wind, or tabs that lift easily.
- Daylight through the roof boards, or water stains on the attic sheathing and rafters after rain.
- A sagging ridge or roof plane, which points to wet or failing decking underneath.
- Stains on the ceilings of upstairs rooms, especially near chimneys, vents and skylights.
- A second layer of shingles already on the roof. Most codes allow two layers at most, so the next replacement means tearing both off.
What makes a roof last longer
- Clean the gutters in spring and fall so water does not back up under the roof edge. The fall home maintenance checklist has the timing.
- Keep the attic cool and dry. Soffit and ridge vents let heat and moisture out; a hot attic bakes shingles from below, and a damp one rots the decking.
- Seal and insulate the attic floor. Warm air leaking up melts snow on the roof and causes ice dams in cold climates; see the winter home maintenance checklist.
- Trim branches back from the roof, and clear moss and piles of leaves that hold water.
- Look at the roof from the ground with binoculars twice a year and after big storms, and fix a few missing shingles or a lifted flashing before water finds the gap.
- Stay off the roof yourself when it is wet, icy or steep. A roofer can inspect it safely.
Repair or replace
A roof under about two thirds of its expected life with a few missing shingles or a leak at one flashing is a repair. A roof near the end of its range with widespread curling, granule loss or several leaks is a replacement, and patching it buys little time.
Plan the replacement for late spring through early fall, when shingles seal well in the warm weather and roofers can schedule it. A roof replaced before it leaks costs only the roof; one replaced after a leak often adds drywall, insulation and paint.
Keep the roof on record
Write down the year the roof went on, the type and brand of shingle, the contractor and the warranty. Buyers, inspectors and insurers all ask for the roof age, and a dated receipt answers in a sentence. Housemap keeps that record in your house file next to the furnace and the water heater, with the year the house was built from the public record where your state publishes it, and puts the roof into your home maintenance budget.
Questions
How long does a roof last?
An asphalt shingle roof lasts about 20 years for three tab shingles and about 30 for architectural shingles. Wood lasts about 25 years, metal 40 to 80, slate 60 to 150 and clay or concrete tile 100 years or more.
How can I find out how old my roof is?
Look up the roofing permit at your town or county building department, check the seller disclosure or home inspection report from your purchase, and look for receipts or a shingle warranty. If there is no paper trail, a roofer or home inspector can estimate the age from wear.
Can a roof last 50 years?
Asphalt shingles usually do not. Metal, slate and tile roofs often last 50 years or more when the flashing and fasteners are maintained.
What shortens the life of a roof?
Poor attic ventilation, clogged gutters, ice dams, moss and overhanging branches that hold water, storm damage left unrepaired and a second layer of shingles over an old one.
Sources
- InterNACHI standard estimated life expectancy chart (roofing: three tab 20, architectural 30, wood 25, metal 40 to 80, slate 60 to 150, clay or concrete 100+, EPDM 15 to 25)
- National Roofing Contractors Association (homeowner resources and finding a roofer)
- ENERGY STAR: seal and insulate the attic (warm air leaks and ice dams)
Related guides
Keep the roof year with the house.
Housemap keeps the roof, furnace, water heater and every other system in one file, with the dates, the receipts and a reminder before each job comes due.
