What is the useful life of a roof replacement, and how do insurers use it?
Short answer. Insurers and their estimating software assign each roofing material an expected useful life and depreciate an existing roof based on its age against that life, which is why a claim on an older roof can pay less upfront than full replacement cost. A replacement resets the clock, so a new roof carries little or no depreciation if a storm hits soon after.
How depreciation uses useful life
On a replacement cost policy, the first payment is usually actual cash value: replacement cost minus depreciation. Roof depreciation is commonly based on age compared with the material's expected life, adjusted for condition, so a shingle roof halfway through its expected life can be depreciated by a large share of its value. The recoverable portion is usually paid after the work is done, depending on the policy; see recoverable depreciation on a roof.
Why the numbers differ between claims
- Different expected lives for 3-tab, architectural and impact-rated shingles.
- Age disputes when the install date is unclear.
- Condition adjustments, up or down.
- Policies that settle older roofs at actual cash value only, or on a payment schedule by roof age, where depreciation is never recovered.
What a new roof changes
- Depreciation starts over at or near zero.
- Some insurers write or renew more readily, or with better roof terms, on newer roofs.
- The invoice and permit prove the install date if a claim comes years later.
Physical life still rules
None of this changes how long the roof really lasts, roughly 20 to 30 years for architectural shingles in Georgia. See how long a roof lasts in Georgia and roofing warranties explained.