Why Are My Shingles Curling? 3 Causes

Why are my shingles curling?

Published October 13, 2026 · John Beal, Owner, John Beal Roofing

Shingles usually curl for one of three reasons: they're getting old, there's too much heat in the attic, or they weren't nailed right. Curling shingles can let water in, so it's worth getting the roof looked at before a small problem turns into a leak.

You notice it from the driveway or the backyard. The edges of some shingles aren't lying flat anymore. Some turn up at the corners, some cup in the middle. It doesn't look like much, but it's your roof telling you something. Here's what usually causes it and why it shouldn't wait.

Cause one: the shingles are getting old

This is the most common reason. Asphalt shingles slowly dry out after years of sun, heat and cold. As they lose their flexibility, the edges start to lift. Old roofs often show other signs at the same time, like bald spots where the granules have washed off, or granules piling up in the gutters. If you see curling across most of the roof along with those signs, the roof is wearing out.

Cause two: too much heat in the attic

Your attic is supposed to breathe. Air comes in low, usually at the soffits, and leaves high, at the ridge or roof vents. When that airflow is blocked or never set up right, summer heat builds up under the roof deck and bakes the shingles from underneath. That's how a roof that isn't very old can start curling early. A hot, stuffy attic is a clue. So is a roof where the curling shows up in patches instead of evenly.

Cause three: they weren't nailed right

Every shingle is designed to be nailed in a specific zone. Nails set too high, too few nails, or nails driven crooked leave the shingle free to lift and move. Wind works on it, the seal breaks, and the edges curl. This one is an installation problem, and it tends to show up in rows or sections rather than everywhere.

Why curling shingles shouldn't wait

A shingle only keeps water out when it lies flat over the one below it. Once the edge lifts, wind-driven rain can get behind it, and the next strong gust can catch it and tear it loose. A curled shingle today is a missing shingle after the next storm, and a missing shingle is an open door for water into the wood underneath.

Don't climb up there to check. A roof with loose, brittle shingles is slippery and dangerous. Look from the ground, take a picture if you can, and let someone with the right gear get up close.

What happens when we look at it

We figure out which of the three it is, because the fix is different for each. Old shingles across the whole roof usually mean it's time to replace. Attic heat means fixing the ventilation, or the new roof will curl too. A nailing problem in one area may be a repair. We'll show you what we found and tell you straight. The inspection is free, and our phones are answered 24/7.

What John says in the video

Transcript: Why are my shingles curling? Usually one of three things. One: they're getting old. Two: too much heat in the attic. Three: they weren't nailed right. Curling shingles can let water in. Get it looked at. Call me. 1-800-JOHN-BEAL.

Frequently asked questions

Are curling shingles a problem?

Yes. A shingle that lifts or curls no longer lies flat over the one below it, so wind can get under it and rain can blow in behind it. It is one of the clearer signs a roof needs attention.

Can a newer roof have curling shingles?

It can. If the attic runs too hot or the shingles were not nailed correctly, curling can show up on a roof that is not old at all. That is worth having checked, because it points to an installation or ventilation problem.

How does attic heat make shingles curl?

Heat trapped in the attic cooks the shingles from underneath. Over time that dries them out and makes them warp. Good attic ventilation lets that heat escape.

Can you fix curling shingles without a new roof?

Sometimes. If it is limited to a few spots, a repair may do it, and fixing the ventilation can stop it from spreading. If the curling is across the whole roof, it is usually a sign the roof is near the end.

Who can inspect my curling shingles?

We can. The inspection is free, and we will show you what is causing the curling and what we would do about it. Call 1-800-JOHN-BEAL, answered 24/7.