5 Signs Your Roof Needs Replacing, Not Just Repair

Nobody wants to hear that they need a new roof. A full roof replacement in Metro Detroit typically runs $8,000 to $20,000 depending on the size of the home and the materials used, and that is a check nobody writes happily. So when a roofer tells you it is time, your first instinct is to wonder whether a repair would do the job instead.

Sometimes it will. A missing shingle, a small leak around a vent pipe, or a section of damaged flashing can often be repaired for a few hundred dollars. But there are situations where patching is just throwing money at a problem that is going to come back, and come back worse. Here are the five signs that a full replacement is the right call.

1. Your Roof Is Over 20 Years Old

Most asphalt shingle roofs in Michigan have a realistic lifespan of 20 to 25 years. The manufacturer might rate the shingles for 30 years or even "lifetime," but those ratings assume ideal conditions — proper ventilation, adequate attic insulation, no ice damming, and moderate weather. Southeast Michigan does not offer moderate weather. Our roofs take punishment from heavy snow loads, freeze-thaw cycles, ice dams, wind-driven rain, and intense summer heat.

If your roof is approaching or past the 20-year mark, individual repairs become less cost-effective. You are patching a system that is at or near the end of its useful life. Every repair buys you a little time, but the underlying materials — the shingle granules, the felt underlayment, the flashing sealants — are all degrading simultaneously. You end up chasing leaks from one spot to another.

That does not mean every 20-year-old roof needs immediate replacement. But it does mean you should have it inspected by someone who will tell you honestly what shape it is in, not someone who needs to sell you a roof this week.

2. Shingles Are Curling, Buckling, or Missing Granules

Walk out to your yard and look at your roof. If the shingles are lying flat with clean, defined edges and uniform color, they are probably still doing their job. If you see shingles that are curling upward at the edges, buckling in the middle, or showing dark patches where the granule coating has worn away, those are signs of systemic failure — not isolated damage.

Granule loss is particularly telling. Those tiny stone granules embedded in the shingle surface are what protect the asphalt from UV radiation. When they wear off, the asphalt underneath dries out, cracks, and becomes brittle. You will often see granule accumulation in your gutters as a roof ages. A few granules after a new roof is normal — they shed excess during the first year. Heavy granule loss on an older roof means the shingles are breaking down.

Curling and buckling usually indicate either poor ventilation causing excessive heat buildup in the attic, moisture trapped beneath the shingles, or simply old age. Any of these means the shingles have lost their ability to shed water effectively and are vulnerable to wind uplift. Repairing a few curled shingles when the rest of the roof looks the same is a temporary fix at best.

3. You Can See Daylight Through the Roof Deck

This one requires a trip to the attic. On a sunny day, go up to your attic, turn off any lights, and look at the underside of the roof deck. If you can see pinpoints of light coming through, that means water can get through too. Small spots of light might indicate a few missing or cracked shingles that could be repaired. But if you see light in multiple areas, or if the roof deck boards themselves look dark, stained, warped, or soft, you are looking at a roof system that has been compromised.

While you are up there, check for signs of moisture — dark stains on the wood, mold or mildew growth, damp insulation, or frost on the underside of the roof deck in winter. Any of these indicate that water is getting past the shingles and into the structure. Persistent moisture in the attic leads to rot in the roof deck, which means a replacement will include not just new shingles but new plywood decking as well — adding to the cost but absolutely necessary for a sound roof.

4. Multiple Leaks or Recurring Leaks

A single leak in an obvious location — around a plumbing vent, at a skylight, or where two roof planes meet in a valley — is usually repairable. The flashing has failed or a small section of shingles has been damaged, and a competent roofer can fix it for a reasonable cost.

But when you are experiencing leaks in multiple locations, or when a leak that was repaired comes back in the same spot or a nearby spot, that is a pattern indicating the entire roof system is failing. The shingles, underlayment, and flashing are all aging together, and fixing one failure point just moves the next failure to the weakest remaining spot.

In Metro Detroit, ice dams are a frequent cause of recurring leaks. Ice dams form when heat escaping from the attic melts snow on the upper portion of the roof. The meltwater runs down and refreezes at the colder eaves, creating a dam of ice that backs water up under the shingles. If your roof was not installed with proper ice and water shield membrane along the eaves — and many older roofs in this area were not — ice dam leaks will happen year after year. The real fix is a new roof with ice and water shield installed to code, combined with improved attic insulation and ventilation.

5. The Roof Deck Is Sagging

Stand across the street from your house and look at the roofline. It should be straight and level along the ridge, with clean, straight lines along the rakes and eaves. If the ridge is sagging, if you can see dips or waves in the roof surface, or if the roof appears to be drooping between the rafters, you have a structural issue that goes beyond shingles.

Sagging usually means the roof deck — the plywood or boards that the shingles are nailed to — has absorbed moisture and is deteriorating. In severe cases, the rafters or trusses themselves may be damaged. This is not a repair situation. A sagging roof needs to be stripped to the structure, damaged decking and framing replaced, and a new roof system installed from scratch.

This is also a safety concern. A severely compromised roof deck can fail under heavy snow load, and Michigan winters deliver plenty of that. If your roof is showing visible sag, get it inspected by a licensed contractor immediately — not next spring, now.

What a Roof Replacement Involves

A proper roof replacement in Metro Detroit includes stripping all existing shingles and underlayment down to the deck, inspecting and replacing any damaged decking, installing new ice and water shield along eaves, valleys, and around penetrations per Michigan code, laying new synthetic underlayment over the entire deck, installing new drip edge along eaves and rakes, installing new flashing at all penetrations, valleys, and wall intersections, applying new shingles with proper nailing patterns and exposure, replacing soffit and fascia as needed, and installing ridge vent for attic ventilation.

The job typically takes two to four days for a standard residential roof and should include a full cleanup — magnetic sweeps for nails, removal of all debris, and inspection of gutters and landscaping.

Get an Honest Assessment

At Pro-Time Services, we offer free roof inspections for homeowners throughout Wayne, Macomb, and Oakland Counties. We will tell you honestly whether your roof needs a repair or a replacement, explain why, and provide a detailed written estimate if replacement is warranted. We do not use high-pressure sales tactics or push unnecessary work.

If a repair will solve the problem, we will tell you. If a replacement is the right call, we will explain exactly what we recommend and why. Learn more about our roofing services or schedule a free inspection.