If you’ve noticed new roof shingles not laying flat after installation, you’re not alone. This issue is more common than many homeowners realize, and while it doesn’t always indicate a major problem, it can affect the appearance and performance of your roof if left unaddressed.

In this guide, you’ll learn:

Why new roof shingles might appear lifted, wavy, or buckled.
What causes the issue and how to tell if it’s temporary or permanent.
The best ways to fix the problem and prevent it from happening again.

Let’s break down what you should expect from a new shingle roof—and when to take action.

👉 Why Flat Shingles Are Important

Shingles are designed to form a smooth, overlapping pattern that sheds water and seals out wind. When shingles don’t lay flat, the integrity of your roof can suffer.

Water protection: Raised shingles allow water to seep underneath, increasing the risk of leaks and rot.
Wind resistance: Loose or lifted shingles are more likely to blow off during Montana windstorms.
Curb appeal: Wavy or bumpy shingles can make a brand-new roof look unfinished or poorly installed.
Warranty coverage: Some manufacturers may deny warranty claims if shingles weren’t installed correctly.

roofer installing roof shingles with pnuematic roofing nailer.

🏠 What to Expect After a New Installation

It’s important to know that some unevenness is normal immediately after installation. In many cases, the issue resolves itself within a few days or weeks.

Settling Period

Asphalt shingles may appear raised or stiff for the first few days.
Shingles need heat from the sun to relax and seal to the ones below.
If installed in cold weather, the settling process may take longer.

Signs to Watch

Minor curling at the edges is normal for a short time.
Full lift, severe wrinkles, or permanent buckling could indicate a larger issue.
If shingles still haven’t settled after a few weeks of warm weather, it’s time to investigate.

⭐️ 5 Reasons Why New Roof Shingles Aren’t Laying Flat

If your new shingles still look off, one or more of these issues could be the cause.

Cold weather installation: Shingles are stiffer in cold conditions and may not seal properly. Fix: Wait for consistent sun and warmer temps; shingles will likely self-correct once the adhesive activates.
Poor ventilation: Inadequate attic airflow causes moisture buildup and warping in roof decking. Fix: Have a roofing contractor inspect your attic ventilation and correct any airflow issues.
Improper nail placement: Overdriven or misaligned nails can prevent shingles from sitting flush. Fix: If isolated, a few shingles may be removed and replaced; widespread problems may require professional repair.
Uneven roof decking: Old decking with dips or humps can distort the appearance of shingles. Fix: Decking should be replaced or shimmed during installation. If overlooked, rework may be needed.
Storing shingles incorrectly before use: Shingles stored on an uneven surface or exposed to moisture may retain a warped shape. Fix: Replace affected bundles and ensure proper storage on-site.

Black shingles newly installed on house

⏰ How Long Should It Take for Shingles to Flatten?

In most cases, a new roof installed correctly in mild weather should look uniform within 1–2 weeks. Shingles require sunlight and heat to activate their sealant strips and relax into place.

Installed in summer: Usually flattens in a few days.
Installed in late fall or early spring: May take up to 3 weeks to fully lay down.
Installed in winter: Expect delays in sealing until the first few warm days arrive.

📞 When to Call a Roofing Contractor

If your shingles don’t settle after a reasonable period—or if the roof looks worse with time—a professional inspection is the next step.

Widespread lifting or curling: Could indicate poor installation or material issues.
Leaks appearing after storms: May suggest shingles didn’t seal or flashing was installed incorrectly.
Repeated blow-offs or wind damage: Sign that the adhesive didn’t activate or shingles were improperly fastened.

A professional roof inspection can identify the root cause and help you take action before the problem leads to further damage.

selective focus of grey shingles on rooftop of building

🤔 How to Prevent Shingles From Curling in the Future

Proper installation, storage, and planning can reduce the risk of uneven shingles—especially in climates like Montana’s where temperature shifts are common.

Schedule installation during mild weather: Spring and fall offer the best conditions for shingle adhesion and flexibility.
Work with a qualified roofing contractor: Experienced pros understand local conditions and install according to manufacturer specs.
Use high-quality underlayment: A stable, smooth base layer helps shingles sit flat from day one.
Store shingles properly on-site: Keep bundles flat and covered until it’s time to use them.
Ensure adequate attic ventilation: Balanced airflow keeps the roof deck stable and prevents heat buildup under shingles.

🤝 Why Montana Roofing Solutions Is the Team You Can Trust

At Montana Roofing Solutions, we take the time to get it right—because a roof that looks wrong is often installed wrong. Whether you’re noticing new roof shingles not laying flat or simply want peace of mind after a recent installation, we’re here to help.

From installation to repair, we treat your roof like it’s our own. If you’ve found new roof shingles not laying flat, don’t wait for more problems to show up. Whether you need expert eyes on the issue or fast repairs to prevent future trouble, Montana Roofing Solutions has the knowledge and tools to help.

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