Repair or replace? Here is how to decide without getting sold.

Contractors who only do replacements will always recommend replacement. Contractors who do both have the ability to give you the honest answer. The repair vs replace question has a framework. Work through it in the right order and the answer usually becomes clear before you need to rely on anyone's sales pitch.

Age first. Everything else second.

Roof age is the starting point. It is also the variable that most homeowners underweight.

A 5-year-old architectural shingle roof has 80 to 90 percent of its useful life remaining. Repairing localized damage on that roof makes complete sense. The underlying system is sound. You are extending something that has years of value left.

A 22-year-old architectural shingle roof has used most of its useful life. Repairing 10 percent of that roof buys you 3 to 5 more years before the remaining 90 percent starts failing. You are spending money now to avoid spending slightly more money soon. And you are doing it on a roof that has been through 22 Oklahoma summers, 22 hail seasons, and 22 sets of freeze-thaw cycles. The decking is older. The underlayment is older. The flashing seals are older.

The 15-year rule

Use 15 years as a rough dividing line for standard architectural shingles in Oklahoma. Under 15 years: repair is usually the right call for limited damage. Over 15 years: the replacement conversation is worth having even for moderate damage, because you are comparing the repair cost against the cost of buying yourself 5 more years versus buying yourself 20 more years.

The extent of damage and the 30% rule

The 30% rule is a guideline used in the industry: if the repair scope exceeds 30 percent of the total roof area, replacement typically makes more financial sense than repair. The logic is that patching nearly a third of the roof costs nearly what a full replacement costs, and you still have the remaining 70 percent on its original aging clock.

This is a guideline, not a law. Use it as a prompt for a deeper conversation, not as an automatic answer. The relevant question is: what does the cost of the repair compare to the cost of the full replacement, and what does each option buy you in terms of time?

For storm damage specifically, if the damage is distributed across the entire roof plane uniformly (as hail damage typically is), a partial repair is often aesthetically and functionally incomplete. Hail that damaged 35 percent of the shingles on the front slope almost certainly damaged the other slopes too. Spot-repairing the visible damage leaves the invisible damage in place.

The decking question

Decking condition is the hidden variable in the repair vs replace conversation. You cannot assess it without removing shingles. On a repair, you remove only what is damaged, which may or may not reveal the decking underneath. On a full replacement, the entire deck is exposed and inspectable.

If your home is 15 to 20 years old and has never had a full replacement, there is a meaningful probability of at least some compromised decking. Moisture intrusion from any previous leak, ice damming, or condensation accumulates over years. OSB absorbs moisture and loses structural integrity. Plywood delaminates. Neither is visible from above until shingles are off.

When a repair uncovers significant decking damage, the repair cost can escalate quickly. A complete roof inspection that includes attic moisture readings can flag decking problems before you commit to a scope.

When insurance changes the math

Insurance coverage fundamentally changes the repair vs replace analysis.

If your damage is insurance-covered and the adjuster approves a full replacement, your out-of-pocket cost is your deductible regardless of whether you repair or replace. In that scenario, replacing the roof at the cost of your deductible versus doing a repair at the cost of your deductible gives you an obvious answer: take the replacement. You reset the roof's clock for the same out-of-pocket cost.

Adjusters make the scope determination, not contractors. If a hail event damages 25 percent of your 18-year-old roof, the adjuster may approve full replacement or may approve limited repair depending on their assessment and your policy terms. The claim process determines the scope. Understanding that process before the adjuster arrives is worth the time.

When repair is clearly the right call

• Roof is under 10 years old with damage limited to one slope or one isolated area.
• Damage is from a single incident (tree limb, isolated leak) rather than distributed storm damage.
• Repair cost is less than 20 percent of replacement cost.
• The repair scope does not require disturbing areas of the roof that are functioning well.
• Insurance is not involved and the budget does not support a full replacement right now.

When replacement is clearly the right call

• Roof is over 20 years old on standard architectural shingles, regardless of damage scope.
• Storm damage is distributed across the full roof plane.
• Decking inspection reveals widespread moisture damage or soft spots.
• You have already done a significant repair within the last 3 years and are facing another major one.
• Insurance approves a full replacement claim.
• You are planning to sell within 5 years and a new roof improves the home's value and inspection outcome.