Roofing guide

How long does a roof last?

About 20 years for 3-tab asphalt shingles and 25 to 30 for architectural shingles, the roof on most US homes. Metal lasts 40 years or more, and slate and clay tile far longer. Where your own roof lands in its range depends mostly on how it was installed, how well the attic is ventilated, and your climate. The table below checks every figure against the home inspectors’ association’s chart and shows what each roof costs per year it lasts.

Last updated: October 2026.

The numbers

Roof lifespan by material

The first column is the range this site uses across its guides. The second is the estimate from InterNACHI, the home inspectors’ association, from its life expectancy chart. The last column turns lifespan into money: what each roof costs per year it lasts on a typical 2,000 sq ft house, at the mid-range prices in our roof cost guide.

Roof lifespan by material, with InterNACHI’s estimate and cost per year
Material	Typical lifespan	InterNACHI estimate	Cost per year of roof
3-tab asphalt shingles	15 – 20 years	20 years	about $590
Architectural shingles	25 – 30 years	30 years	about $500
Standing seam metal	40 – 70 years	40 – 80 years (all metal)	about $520
Exposed-fastener metal panels	Depends on screw upkeep	40 – 80 years (all metal)	–
Clay or concrete tile	About 25 years to the underlayment	100+ years (the tile)	–
Flat roof (EPDM or TPO)	20 – 30 years	EPDM 15 – 25, TPO 7 – 20	about $760
Wood shake	20 – 30 years	25 years	about $1,010
Natural slate	75 – 100 years	60 – 150 years	–

InterNACHI’s chart, checked October 2026, notes that life expectancy varies with weather, installation, maintenance and material quality, and is a guideline, not a guarantee. Cost per year uses each range’s midpoint; a dash means the site doesn’t price that material or the cost depends on more than the roof covering.

On most houses the numbers that matter are the first two rows. The Asphalt Roofing Manufacturers Association puts asphalt shingles on about four out of five US homes. Per year, architectural shingles and standing seam metal come out close, about $500 and $520, which is why the choice between them is mostly about how long you’ll stay; our guide to what a metal roof costs works through it.

Reading the table

Tile, flat roofs and metal panels: where the numbers differ

Clay and concrete tile. The tiles themselves can last a century, which is the figure InterNACHI gives. What wears out first is the waterproof underlayment beneath them. Association Reserves, which plans long-term repair budgets for homeowner associations, gives standard tile underlayment a useful life of about 25 years, shorter in desert heat. That’s the number that decides when a tile roof needs work, even if many of the tiles can go back on.

Flat roofs. The site’s 20 to 30 years is the hopeful end. InterNACHI gives EPDM rubber 15 to 25 years and TPO 7 to 20. A flat roof’s life depends heavily on drainage and on how its seams were made, so plan on the lower figures unless the roof is well drained and regularly checked.

Exposed-fastener metal panels. InterNACHI gives metal roofs 40 to 80 years as a group. Panels screwed through the face depend on those screws: the manufacturer MBCI recommends checking them at least once a year and replacing any that are loose or rusty. Kept up, the metal can last; neglected, the roof leaks at the screws long before the panels wear out.

What matters

What decides where your roof lands in its range

Two roofs of the same material on the same street can wear out years apart. The material sets the range; these decide where in it your roof ends up.

Installation. Misaligned flashing, missed nails or skimped underlayment can make a roof fail early whatever the shingle. Who installs it matters as much as what goes on.

Attic ventilation. A hot attic cooks shingles from underneath. The Asphalt Roofing Manufacturers Association says good ventilation moves heat out of the attic, which helps the roof last, and moves moisture out too, which protects the decking. It needs air coming in low at the eaves and going out high near the ridge.

Climate. Strong sun and heat age shingles faster, repeated freezing and thawing works at joints and flashing, and salt air near the coast corrodes metal and fasteners. Hail and high wind do their damage all at once.

Pitch. Steeper roofs shed water and debris quickly. Low-slope roofs hold water longer and depend more on their seams and flashing.

Maintenance and trees. A small flashing leak fixed early stays small; left alone, it can rot the decking under it. Overhanging branches scrape shingles and fill gutters, and shaded, damp sections grow moss that holds moisture against the roof.

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Warning signs

Signs you need a new roof

Age alone doesn’t tell the whole story, because two roofs the same age can be in very different shape. Here are the physical signs you need a new roof rather than another patch repair: the things a contractor looks for when deciding whether repair still makes sense. If you’re weighing a patch, our repair prices by problem show what each fix usually costs, and our guide to deciding whether to repair or replace shows how to weigh it.

Curling or cupping shingles

When shingle edges curl up (curling) or the middle rises while edges stay flat (cupping), the material is drying out and losing flexibility. Both mean the shingles are near the end of their ability to protect against water.

Heavy granule loss

Asphalt shingles are coated in mineral granules that protect against UV. Finding a significant volume in your gutters after rain, or seeing bare, discolored patches on shingles, means the protective layer is going.

Missing or cracked shingles

A few missing shingles can be repaired. Widespread cracking or missing sections across multiple roof areas suggest the whole roof has aged to the same point and replacement is more economical than ongoing patch repairs.

Sagging or uneven roofline

Any visible dip or sag in the roofline points to structural issues, typically water-damaged or rotted decking beneath the surface. This is beyond cosmetic and needs attention quickly.

Daylight in the attic

If you can see light through the roof boards when you check your attic during the day, water can get through too. Check for daylight and also for water stains on rafters or insulation.

Recurring leaks after repair

One leak repaired properly should hold. If you're patching the same area repeatedly, or finding new leaks in different spots each season, the roof is failing systematically and a repair budget is being wasted on borrowed time.

If your roof is near the end of its expected life and you’re seeing two or more of these signs, it’s worth getting a professional assessment. Our cost-per-year rule helps you judge any repair quote you’re given. A good contractor will give you an honest view of whether you're looking at a repair or a full replacement. You can get a free replacement estimate to understand what the numbers look like before you commit to anything.

Getting more years

How to extend your roof's lifespan

You can't stop a 20-year-old asphalt roof from aging, but you can make sure it reaches the top of its range rather than the bottom. The main levers are regular inspection, keeping water moving away from the structure, and dealing with small problems before they grow.

Inspect your attic twice a year, ideally after the first major storm of winter and again in late spring. Look for water stains, soft spots in the decking, and daylight. On the exterior, clear gutters each fall and after any large storm, and look for shingles that have shifted, cracked, or gone missing. If you spot flashing that's lifted or sealant that's cracked around vents and chimneys, those are cheap fixes that prevent expensive water damage.

Moss and algae treatments help wood shake and can help asphalt too. If you live in a shaded, damp spot, ask about algae-resistant shingles when you replace, and compare their warranty with the standard version.

Have a roofer check your attic ventilation whenever they’re up there for a repair. Blocked soffit vents or an undersized ridge vent can leave the attic running hot, which, as above, shortens a roof’s life.