Roof Repair or Replacement? How to Decide

Repair the roof when the problem is limited to one area, the shingles still have years of life left and the decking underneath is solid. Replace it when the shingles are near the end of their life, leaks show up in more than one place, the decking is soft or rotted, or you find yourself paying for repairs every year. The age of the roof and how widespread the damage is decide it far more often than any single leak.

Start with the age of the roof

Age is the first question we ask, because it frames everything else.

On Cape Cod, sun, wind and salt air are hard on roofs. Architectural asphalt shingles commonly last somewhere around 20 to 25 years here, and older three-tab shingles often less. Your roof may do better or worse depending on ventilation, installation and exposure.

• Under 10 years old. A problem is almost always a repair, and it may point to an installation or product issue. Check whether any workmanship or manufacturer warranty applies.
• 10 to 20 years old. It depends on condition. A sound roof with one bad flashing is a repair. A roof that is wearing out across the board may not be worth patching.
• Past 20 years. Start planning for replacement, even if the current problem is small. Repairs on an old roof tend to buy months, not years.

How much of the roof is affected

Localized damage is a good candidate for repair:

• A few shingles blown off in a storm
• A cracked rubber boot around a plumbing vent
• Loose or failed flashing at one chimney or wall
• Damage from a single fallen limb

Widespread wear points to replacement:

• Granules washing off across whole slopes, showing up in gutters and downspouts
• Shingles curling, cupping or cracking over large areas
• Many missing or loose shingles after ordinary weather
• Moss or algae that has worked under the shingles in many places

A rough rule many roofers use: if the damage covers a large share of a roof slope, or the repair is going to cost a meaningful fraction of a new roof, replacement is usually the better money.

Where the leak is coming from

The location of a leak says a lot about its cause.

• Near a chimney, skylight, wall or vent. Most leaks start at flashing, not shingles. These are often repairable, as long as the flashing is replaced properly and not just smeared with roofing cement.
• In the open field of the roof, or in several places. That points to shingles that have stopped doing their job, which usually means replacement.
• At the eaves in winter. That is often an ice dam rather than a failed roof. See why ice dams form and how to stop them.

Keep in mind that water travels along rafters and decking before it drips, so the stain on your ceiling may be several feet from where the water gets in.

What is going on underneath

Shingles can look tired but fine from the ground while the deck underneath is failing. Check the attic:

• Soft or spongy spots when someone walks the roof
• A sagging roofline
• Dark stains, rot or mold on the underside of the decking
• Daylight coming through
• Wet or matted insulation

If the decking is damaged in more than a few spots, the roof needs to come off so it can be replaced. Patching shingles over rotted plywood does not fix anything. If you are not sure what you are looking at, have a roofer check it.

If your roof has already been recovered once, there are two layers of shingles on it. Building codes limit how many layers a roof can carry, so the next roof will be a full tear-off. Repairs on a two-layer roof are also harder to do well, since the new shingles have to seal over an uneven surface. On a double-layer roof that is near the end of its life, replacement is usually the smarter move.

The cost of repeated repairs

Add up what you have spent on the roof in the last few years. If you are calling a roofer every spring, those service calls and patches can approach a meaningful part of the cost of a new roof, and you still have an old roof at the end of it.

Matching is another issue. Shingle colors and product lines change, and old shingles fade. A repair on an older roof often stands out, which matters if you care about curb appeal or plan to sell.

Insurance claims and selling the house

Insurance claims

If the damage came from a specific event, such as a storm or a fallen tree, it may be worth talking to your insurance company. Policies commonly cover sudden damage and often exclude normal wear and age, but every policy is different, and the adjuster decides what is covered. Take photos, prevent further damage where it is safe to do so, for example with an emergency tarp, and call your insurer. A roofing contractor can document the condition of the roof, but the coverage decision belongs to the insurance company.

Some insurers also ask about roof age when writing or renewing a policy, which is worth knowing if your roof is getting old.

If you plan to sell soon

A buyer's home inspector will note the age and condition of the roof. An old roof can become a negotiating point or a concern for the buyer's insurer. If your roof is sound with a minor issue, a proper repair and a record of the work may be enough. If it is near the end of its life, replacing it before listing can take one big objection off the table. Either way, know the condition before a buyer's inspector tells you.

A quick way to decide

Repair makes sense when

• The roof is under about 15 years old and in good overall condition
• The problem is in one spot, often flashing or a few shingles
• The decking is solid
• There is only one layer of shingles

Replacement makes sense when

• The roof is around 20 years old or more
• Wear shows across whole slopes
• Leaks appear in more than one place
• The decking is soft or rotted
• There are two layers already
• Repairs have become a yearly expense

Get an honest assessment

If you are not sure which side your roof is on, have it inspected before you spend money either way. Best Deal Home Group offers free estimates for roof repair and replacement across Cape Cod. We will tell you plainly whether a repair will hold or whether you are better off replacing, and if replacement is the answer, our guide on roof replacement cost on Cape Cod explains what goes into the price. Call (774) 470-8511 or contact us.