Start with what you're seeing
A roof assessment is needed to confirm the cause and extent of damage. What you've noticed can help a roofer decide where to look. GAF's homeowner guidance highlights localized leaks, widespread shingle deterioration and repair history as factors in the decision.
| What you're seeing | What it usually points to |
|---|---|
| One leak, in one spot | Often a repair. Ask where the water is getting in and whether the rest of the roof is sound. |
| A few shingles lost in a storm | Usually a repair. Ask how closely new shingles will match. |
| The same leak keeps coming back | Could go either way. Ask whether the source was ever found and how this fix differs from the last one. |
| Curling, bald or cracked shingles all over | Often replacement. Ask for both prices and what a repair would leave unfixed. |
| Sagging, soft spots or daylight in the attic | Needs an assessment. Sagging or soft decking may need structural work as well as new roofing. Ask what needs replacing and how it's priced. |
When a repair makes sense
- The problem is in one area, with a clear cause
- The rest of the roof is in reasonable shape for its age
- It's the first repair, not the fourth
- The repair addresses the cause without leaving widespread damage unresolved
When replacement makes sense
- Damage is spread across several areas or slopes
- Repairs are becoming a yearly event
- The decking is soft or sagging
- You're staying for years and want one job done properly, with ice protection and ventilation brought up to date
Compare the scope before the totals
What does each price cover?
A flashing repair and a full roof replacement solve different problems. Ask which leak or damaged area a repair addresses, whether the rest of the roof is sound, and what problems would remain. For replacement, compare tear-off, decking allowances, flashing and ventilation in the written scope. Neither price alone tells you which option your roof needs.
To size a replacement, the roof squares and cost calculator applies published Michigan prices to your roof, and the reroof permit and overlay checker shows whether new shingles can go over the old ones.
Ask for both options in writing
If repair and replacement are both realistic, ask the roofer to price each one. Compare what each fixes, what it leaves, and any warranty that comes with it. The lowest number today is only part of the picture. Compare the published prices in the roof replacement cost guide and roof repair cost guide.
Common questions
How long does a roof last in Michigan?
There is no single lifespan for every Michigan roof. Weather exposure, shingle type, installation and ventilation all affect how it ages. Ask a roofer to assess the shingles, flashing and decking rather than relying on age alone.
Is there an age when a roof should always be replaced?
No. A localized flashing problem on an otherwise sound roof may be repairable. Widespread damage, structural issues or repeated repairs may make replacement more sensible. Ask for an assessment and a written scope for each realistic option.
Should I get a second opinion?
For a full replacement, it's reasonable. Compare the scope line by line, not just the totals.
Where this guidance comes from
The guidance on roof condition, lifespan factors and repair history on this page come from these published pages, checked on October 2, 2026.
- GAF: How Often Should You Replace Your Roof? · US roofing manufacturer's guidance on roof condition, lifespan factors and repair history, August 24, 2026
