After a storm, a leak, or a failed inspection, every Missouri homeowner faces the same question: should I repair what's there or replace the whole thing? The wrong answer costs thousands. Here's a clear decision framework — the same one our former insurance adjusters use when evaluating roofs every day.
The Decision Framework: 4 Key Factors
1. Roof Age
✓ Repair if:
Under 10 years old
→ Replace if:
Over 15–20 years old
Asphalt shingle roofs in Missouri have an effective life of 20–25 years. A roof under 10 years with isolated damage is a strong repair candidate. A roof over 15 years with any significant damage is almost always better replaced — you're investing repair money into an end-of-life asset.
2. Damage Extent
✓ Repair if:
Isolated to 1–2 areas
→ Replace if:
Widespread across multiple planes
If damage is limited to one section (e.g., a single roof plane, one valley, or a small area around a penetration), repair is logical. If damage appears on multiple roof planes or covers more than 25–30% of the total area, replacement delivers better long-term value.
3. Cost Ratio
✓ Repair if:
Repair < 30% of replacement cost
→ Replace if:
Repair > 50% of replacement cost
The "50% rule": if your repair estimate exceeds 50% of what a full replacement would cost, replace the roof. Spending $6,000 to repair a roof that needs $14,000 to replace — and that's already 15 years old — rarely makes financial sense.
4. Insurance Coverage
✓ Repair if:
Damage doesn't meet deductible
→ Replace if:
Qualifying storm damage present
If storm damage qualifies your roof for an insurance claim, replacement is almost always covered. There's no reason to pay out of pocket for a repair when a full replacement may be covered. SRA provides free inspections to determine storm damage eligibility.
When Repair Is the Right Call
- Roof is under 10 years old with isolated storm or wind damage
- A small number of missing or blown-off shingles on an otherwise sound roof
- Minor flashing failure around a chimney or vent
- Single leak isolated to one penetration or valley
- Repair cost is well under 30% of replacement cost
When Replacement Is the Right Call
- Roof is 15+ years old with any significant storm or hail damage
- Multiple leaks in different areas of the roof
- Granule loss widespread across multiple planes
- Two or more layers of existing shingles (already had one re-roof)
- Visible daylight through the attic deck in multiple areas
- Insurance adjuster has confirmed qualifying storm damage
- Repair estimate exceeds 30–50% of replacement cost
⚠️ The Trap: Repeated Repairs on an Aging Roof
The most expensive mistake homeowners make is paying for multiple repairs on a roof that's already past its effective life. A $400 repair today, $600 next year, $800 the year after — and you still end up replacing it at year 18. You've spent $1,800+ in repairs that bought you nothing. One professional inspection can tell you if you're in this trap.
Frequently Asked Questions
How do I know if I need a roof repair or full replacement?
Key factors are roof age, extent of damage, and cost ratio. If repair costs exceed 30% of replacement cost, or your roof is over 15 years old with widespread issues, replacement is usually more cost-effective.
What is the 50% rule for roof replacement?
The 50% rule states that if the cost to repair your roof exceeds 50% of the replacement cost, it's more economical to replace the entire roof.