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Homeowner Guide

When Should You Replace Your Roof? 8 Warning Signs

March 16, 2026 · DeHart Roofing

8 signs it is time for a new roof

Not every roof problem requires a full replacement. But some signs point clearly to the end of your roof's useful life. Here are the eight most reliable indicators.

  1. Age. If your asphalt shingle roof is 20+ years old, it is approaching or past its expected lifespan in the Central Valley. Tile and metal roofs last longer.
  2. Widespread granule loss. Check your gutters and downspouts. Heavy granule accumulation means shingles are degrading and losing their UV protection.
  3. Curling or buckling shingles. Shingles that curl at the edges or buckle in the middle have lost their waterproofing ability and cannot be repaired.
  4. Multiple active leaks. One leak may be a repair. Multiple leaks in different areas suggest systemic failure.
  5. Daylight through the roof deck. If you can see light from your attic, moisture is getting in too.
  6. Sagging roof deck. A sagging roofline indicates structural damage from long-term moisture exposure. This requires immediate attention.
  7. Moss or algae growth. While not always a replacement indicator, widespread growth can signal moisture retention and underlayment failure.
  8. Rising energy bills. A failing roof reduces insulation effectiveness, causing your HVAC system to work harder.

Repair vs. replacement

If damage is limited to a small area and the rest of the roof is sound, a repair may be the right call. If you are seeing multiple signs from the list above, replacement is usually more cost-effective than repeated repairs. DeHart's free inspection will tell you exactly where you stand.

Start with a free inspection.

No pressure. No obligation. Just an honest look at your roof.

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