How Often Should You Replace a Roof?
Quick answer
How often you replace a roof depends on its material: asphalt shingles every 15–20 years, wood shakes 20–30, tile and slate 50–100, and metal 50+ (often a lifetime). So a 20-year-old asphalt roof is typically due, while a quality metal roof may never need replacing — which is why many homeowners replace asphalt with metal to break the cycle.
How often do you need to replace a roof?
It depends almost entirely on the material. Standard asphalt shingles last about 15 to 20 years, and architectural asphalt a little longer at 20 to 25. Wood shakes run 20 to 30 years with upkeep. At the durable end, clay and concrete tile and natural slate last 50 to 100 years, and metal roofing lasts 50+ years — often the lifetime of the home. So the honest answer to "how often should you replace a roof?" is: frequently with asphalt, and rarely (if ever) with a quality metal roof.
Is a 20-year-old roof too old?
For an asphalt roof, a 20-year-old roof is at or beyond its typical lifespan, so it should be inspected and a replacement budgeted — even if it looks passable, its water resistance is fading. A 20-year-old metal, tile, or slate roof, by contrast, is still in its prime with decades left. Age has to be read against the material: two decades is old age for asphalt but early middle age for the premium, long-life materials.
What shortens a roof's lifespan?
Several factors can cut a roof's life short of its material's potential. Poor attic ventilation bakes shingles from below and traps moisture; intense sun and heat age asphalt faster; storms, hail, and high wind cause acute damage; and moss and trapped debris hold moisture against the surface. Cheap materials and, above all, poor installation are common culprits — a roof is only as good as how it is put on. Good ventilation, quality materials, and a skilled installer help any roof reach its full lifespan.
How to replace your roof less often — or never
The surest way to stop replacing your roof every couple of decades is to install one that lasts a lifetime. A quality aluminum roof lasts 50+ years and is frequently the last roof a home ever needs, versus asphalt, which you buy and tear off two or three times over the same span — paying for material, labor, and disposal each time. Replacing asphalt with metal turns a recurring expense into a one-time investment, with a transferable lifetime warranty. Our worth-it and cost-of-ownership guides run the numbers.
Frequently Asked Questions
How long does each roofing material last?
Asphalt shingles last about 15–20 years, architectural asphalt 20–25, wood shakes 20–30, clay and concrete tile and slate 50–100, and metal 50+ years, often a lifetime. Material is the single biggest factor in how often you will replace your roof.
Does a metal roof ever need replacing?
Rarely for the homeowner who installs it. A quality aluminum roof lasts 50+ years and does not rust, so for most owners it is the last roof they will buy. That longevity is the core reason people switch from asphalt to metal — to stop replacing the roof every 15 to 20 years.
Should I replace my roof before it fails completely?
Usually yes. Replacing a roof that is near the end of its life, before it leaks, avoids interior water damage, mold, and emergency costs, and lets you plan the project on your schedule and budget. Waiting until a roof fails often turns a planned upgrade into a costly emergency.
Sources
- NRCA — Roofing material service life
- The Aluminum Association — Aluminum roofing durability
Explore Interlock Metal Roofing
Last reviewed 2026-07-13 · Reviewed by Scott Plumptree, Director of Marketing