The Most Common Cause: Poor Installation
The number one reason for roof leaks isn’t age or bad weather — it’s poor installation. When shingles, underlayment, or flashing aren’t properly aligned and sealed, water eventually finds its way inside. Even the best materials won’t last if they’re installed incorrectly.

Common installation mistakes include missing underlayment, misaligned valleys, and loose fasteners that allow moisture to seep beneath the surface. These small oversights can lead to leaks months later, especially after Wisconsin’s heavy rain or winter freeze-thaw cycles.

Other Frequent Causes

• Damaged Flashing: The thin metal that seals edges around chimneys, vents, and skylights can crack or rust, letting water in.

• Clogged Gutters: When gutters overflow with debris, water backs up under the shingles and soaks the roof deck.

• Aging Shingles: Sun and temperature changes cause shingles to dry out, curl, and lose their protective coating.

• Storm Damage: Hail or strong winds can lift shingles, loosen nails, or puncture the roof’s surface — often without visible signs right away.

How to Prevent Roof Leaks
Schedule a professional roof inspection at least once a year, and always after major storms. Keep gutters clean to maintain proper water flow. Replace cracked or missing shingles promptly, and ensure flashing is sealed tightly.

Most importantly, hire a licensed and insured roofing contractor like OPA Construction. Our team provides expert roof leak repair in Wisconsin, using top-quality materials and proven methods to keep your home dry and protected.

Conclusion
Roof leaks are preventable when your roof is installed correctly and inspected regularly. At OPA Construction, we take pride in delivering honest, high-quality roofing services that stand up to Wisconsin’s toughest weather. Whether you need a quick repair or a full replacement, we’re ready to help you protect your investment and your home.

Schedule your roof inspection today — and stop leaks before they start.