Repair-or-replace is an age-times-extent question, and you can answer most of it before calling anyone. This tool weighs your roof’s age against its material’s expected life (InterNACHI’s published ranges), how much of the roof is affected, and how often you have already repaired it – and returns one of three honest answers: repair, repair but start planning, or a replacement assessment is the likely next step.
Age, extent, and history in – one of three honest answers out.
Age past the material’s expected life, damage across multiple slopes, a third-plus repair in a few years, leaks that return after repair, and any deck sag all point toward replacement; localised damage on sound decking with life left points to repair. The table below shows both columns of the ledger.
| Factor | Points toward repair | Points toward replacement |
|---|---|---|
| Roof age vs material life | Under two-thirds of expected life | At or past expected life |
| Extent of damage | One spot or one slope | Multiple slopes or widespread |
| Repair history | First or second repair | Third-plus repair in a few years |
| Leak behaviour | New, single leak | Recurring after repairs |
| Deck condition | Sound decking | Sag, rot, or soft areas |
InterNACHI puts 3-tab shingles at about 20 years, architectural at about 30, metal at 40 to 80, and the flat membranes between 7 and 25 – and the two-thirds point of each range is where this tool starts weighing age against repair. The table below lists both numbers per material.
| Material | Expected life (InterNACHI) | Two-thirds point |
|---|---|---|
| 3-tab asphalt shingle | about 20 years | about 13 years |
| Architectural asphalt shingle | about 30 years | about 20 years |
| Metal | 40 to 80 years | 27+ years |
| TPO membrane | 7 to 20 years | about 9 years (of a 7-20 range, mid-range 14) |
| EPDM membrane | 15 to 25 years | about 13 years |
| Modified bitumen | about 20 years | about 13 years |
Life expectancies: InterNACHI Standard Estimated Life Expectancy Chart. Figures assume normal maintenance and wear, and InterNACHI notes that hot climates drastically reduce asphalt shingle life.
HOW CAN WE HELP YOU?
We are a repair service – what we do is inspect, confirm whether repair still makes engineering sense, and give you the findings in writing. If replacement is genuinely the right path, you will know exactly why, and the inspection report is yours to take forward.
Often – localised damage on sound decking repairs well at any age. The math changes when repairs recur across different slopes, because then you are paying repair prices for replacement-stage problems.
Because age predicts the NEXT failure, not just this one. A 25-year 3-tab roof that leaked at a valley will soon present its next weak point; InterNACHI’s 20-year expected life for that material is the planning line, and Charlotte heat tends to shorten it.
Then you are ahead – and the answer is monitoring, not panic. An annual inspection converts “past expected life” from a worry into a measured remaining-life estimate you can plan around.
