Cracked, Curled, or Missing: A Guide to the Most Common Types of Shingle Damage
If you've ever stood in your driveway squinting up at your roof and thought, "something looks off up there," you're not imagining it. The different types of shingle damage each tell a specific story — and knowing which is which can save you from a small repair bill turning into a full replacement.
Here's what I see on LA rooftops every week, and what each type actually means.
Curling: Cupping vs. Clawing (They're Not the Same)
Curling shingles come in two flavors, and they have different causes.
Cupping is when the edges of a shingle turn upward, creating a bowl shape in the center. This is almost always an attic ventilation problem. Heat and moisture get trapped underneath, and the shingle warps from below. In Sherman Oaks and Encino, where attics can hit 150°F in July, I see this constantly.
Clawing is the opposite — the middle of the shingle lifts while the edges stay flat. Clawing usually means the shingle is aging out, or it was installed over an existing layer without proper adhesion. Either way, curled shingles are no longer shedding water correctly. They're a repair-now situation, not a wait-and-see.
Cracked and Brittle Shingles
Cracking happens when shingles lose their flexibility — usually from UV exposure, thermal cycling (hot days, cool nights), or simply age. You'll often see hairline fractures running across the tab. In Southern California, our sun accelerates this faster than most homeowners expect.
A cracked shingle isn't always an emergency, but it's a direct entry point for water. If you're seeing cracks in more than a handful of shingles, that's a pattern, not a fluke — and it warrants a professional eye.
Blistering: The One Most Homeowners Miss
Blistering looks like small bubbles or pockmarks on the shingle surface. It happens when moisture gets trapped inside the shingle during manufacturing, or when volatile compounds off-gas from poor attic ventilation. Blisters that pop leave raw, exposed asphalt — which degrades fast under UV.
This one gets missed because it doesn't look dramatic from the ground. But it's one of the types of shingle damage that quietly shortens your roof's lifespan by years.
Missing Shingles and Granule Loss
A missing shingle is obvious. Wind, age, or improper nailing — whatever the cause, exposed decking is an immediate leak risk. Replace it fast.
Granule loss is subtler. If you're finding gritty, sand-like material in your gutters, your shingles are shedding their UV-protective coating. Some granule loss is normal on new roofs. Heavy, consistent loss on an older roof means the shingles are nearing the end of their useful life.
What to Do Next
Most of these issues are diagnosable from the ground with a good pair of binoculars. But if you're seeing two or more of these signs at once, it's worth having someone who knows what they're looking at take a closer look — before a $400 repair becomes a $14,000 replacement.
We offer free on-site inspections with a transparent, no-surprise quote. No pressure, no upsell — just an honest read on what your roof actually needs.
📞 Call (866) 685-3889 or book your free inspection online: https://calendly.com/samuelroofinginc
Samuel Roofing Inc. — Sherman Oaks, CA · CSLB #1137536 · 10-Year Workmanship Warranty · Google Guaranteed
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