Your roof is your home’s first line of defense against the elements — but like anything else, it doesn’t last forever. Whether you’re dealing with age, storm damage, or simple wear and tear, recognizing the signs early can save you from costly repairs (or even bigger problems like interior water damage or mold).
So, how do you know when it’s time to replace your roof? Here are the key indicators every homeowner should look for:

1. Your Roof Is Over 20 Years Old
Most asphalt shingle roofs have a lifespan of 20–25 years. If your roof is pushing two decades (especially if it hasn’t had regular maintenance), it might be time to start planning for a replacement — even if everything looks fine from the ground.
2. Shingles Are Curling, Cracking, or Missing
Shingles are designed to create a waterproof barrier. If they’re curling at the edges, cracking, or missing entirely, that barrier is compromised — and water can find its way in.
3. You See Dark Streaks or Moss Growth
Dark streaks are usually caused by airborne algae. While not always a structural issue, they can shorten your roof’s lifespan and hurt your curb appeal. Moss is worse — it traps moisture against your roof and leads to rot.
4. Your Roof Is Sagging
A sagging roof is a serious warning sign — often indicating a structural issue, such as a rotting deck or compromised supports. This is not something to ignore.
5. You’re Noticing Leaks or Water Damage Inside
Water stains on ceilings, bubbling paint, or mold growth in your attic? These are clear signs your roof is letting water in. Even small leaks can cause big problems if left untreated.
Next Steps: Repair or Replace?
Sometimes a roof just needs a minor repair — other times, replacement is the smarter long-term move. A professional inspection can give you peace of mind and help you make the right call. If you’re seeing any of these signs — or just want a second opinion — our team is here to help. We offer free, no-pressure inspections and honest assessments. Whether you need a quick repair or a full roof replacement, we’ve got your back.
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Zimmer Roofing is your Experienced and Trustworthy Contractor