Your roof is your home’s first line of defense against New Hampshire’s heavy snow, ice dams, summer thunderstorms, and high winds. But like every part of your home, a roof has a lifespan. Knowing the signs of trouble early can save you from costly damage and help you plan for a timely replacement. If you’re wondering whether it’s time to call a professional roofer, here are seven warning signs every NH homeowner should watch for.

1. Curling, Cracked, or Missing Shingles

Shingles are designed to create a watertight barrier. Over time, they can curl at the edges, crack, or even go missing altogether after a storm. Once the shingle layer is compromised, water can seep into the underlayment and roof deck. In a state like New Hampshire, where winter storms put roofs to the test, failing shingles are one of the most common signs that it’s time to consider replacement.

2. Granules in Gutters or at Downspouts

Have you noticed dark sand-like particles in your gutters or around your downspouts? Those are protective granules from your shingles. Granules shield your roof from UV rays and weather damage. When they start shedding in large amounts, it’s a clear indicator that the shingles are breaking down and your roof is nearing the end of its useful life.

3. Water Stains or Leaks Inside the Home

Water spots on ceilings or walls are never just cosmetic—they’re a red flag. Leaks often start small, but if ignored, they can lead to mold, rotting wood, and structural issues. Even minor water infiltration can spread quickly during a heavy rainstorm or snowmelt, making timely replacement critical.

4. Moss, Mold, or Algae Growth

While moss or algae may appear to be a simple cosmetic issue, it’s often a sign of trapped moisture. Moss holds water against shingles, speeding up deterioration and increasing the risk of leaks. Mold growth is even more concerning since it can spread into your attic and interior spaces. Professional roof replacement with proper ventilation can stop these problems at the source.

5. Sagging Rooflines

If you step back from your home and notice dips or uneven rooflines, it’s more than an eyesore—it’s a structural warning. A sagging roof may point to compromised rafters, rotted decking, or long-term water damage. This is not an issue that can be patched; it requires professional assessment and often full replacement to ensure safety.

6. Rising Energy Bills from Poor Insulation or Ventilation

Your roof does more than keep the rain out. It plays a huge role in regulating your home’s temperature. Poor ventilation in the attic can trap heat in the summer and cause ice dams in the winter. Insulation gaps lead to higher energy costs year-round. If you’ve noticed your energy bills creeping up, your roof could be to blame.

7. Roof Age (20+ Years for Asphalt Shingles)

Even if you don’t see visible damage, age alone is a major factor. Asphalt shingle roofs typically last 20–25 years, though New Hampshire’s freeze-thaw cycles can shorten that lifespan. If your roof is approaching or has already surpassed this benchmark, it’s wise to schedule an inspection before small issues escalate into emergencies.

Trust Marquis Roofing to Protect Your Home

Recognizing the signs of a failing roof is the first step. Acting on them is what keeps your home safe and your family protected. At Marquis Roofing, we specialize in residential and commercial roofing across New Hampshire. Our team offers free estimates, professional inspections, and expert roof replacements, all backed by industry-leading warranties.

If you’ve noticed any of these warning signs—or if your roof is over 20 years old—don’t wait until the next storm. Contact Marquis Roofing today to schedule your inspection and get peace of mind knowing your home is in good hands.