What is the #1 Cause of Roof Leaks?

 


When homeowners discover a wet ceiling, peeling paint, or even visible water dripping, the immediate concern is a roof leak. While there are several potential culprits behind roof damage, at KVN Portland Roofing, we've inspected and repaired hundreds of rooftops across Portland, and one issue rises above the rest.

The #1 Cause of Roof Leaks: Faulty Flashing

Flashing is the thin metal material installed around roof features like chimneys, vents, skylights, and valleys to prevent water intrusion. When installed improperly or degraded over time, flashing failure becomes the leading cause of roof leaks.

Here’s why flashing is such a critical weak point:

  • It forms the barrier where two different surfaces meet (e.g., chimney and roof slope).

  • Poor installation or aging sealant causes cracks or gaps.

  • Portland’s wet climate accelerates corrosion and wear.

If flashing is compromised, even the most durable roofing system will allow water to infiltrate. Left unchecked, it can lead to mold, rot, and structural issues.

Other Common Causes of Roof Leaks

While flashing is the primary issue, we also see these problems regularly during our inspections:

  • Cracked or missing shingles

  • Clogged gutters causing water to back up under roofing

  • Improper attic ventilation

  • Old or brittle underlayment

  • Punctures from fallen branches or animals

Each of these issues requires a trained eye to diagnose and repair. That’s why working with a reliable Portland roofing company like KVN is essential to getting it right the first time.

Signs You May Have a Roof Leak

Not every leak reveals itself with obvious water stains. Be on the lookout for:

  • Discoloration on ceilings or walls

  • Damp spots in the attic or crawl spaces

  • Dripping after heavy rain

  • Mold or mildew smells indoors

  • Warped or bubbling paint

If you notice any of these symptoms, it's time to contact professional roof leak repair services before the damage worsens.

Roof Leak Repairs Backed by Local Expertise

At KVN Portland Roofing, we bring decades of experience to each repair. Whether it's a minor flashing fix or a full roof assessment, our team knows the unique challenges Portland's weather poses.

We specialize in:

  • Leak detection and diagnostics

  • Flashing and shingle repairs

  • Full roofing inspections

  • Preventative maintenance

Want proof of our quality? See our roofing reviews on Google and learn why so many Portland homeowners trust us.

Neighborhoods We Proudly Serve

We're proud to offer our roofing services across the greater Portland metro area. Here are just a few of the neighborhoods and communities we frequently serve:

  • Alameda

  • Sellwood-Moreland

  • Mt. Tabor

  • Irvington

  • Hawthorne District

  • Northwest Heights

  • Beaverton

  • Lake Oswego

  • Gresham

  • Tigard

If you're in or near any of these areas, give us a call for fast, local help.

Don’t Let a Small Leak Become a Big Problem

Roof leaks are often underestimated—until they lead to costly interior and structural repairs. The good news? With a fast response and the right expertise, most leaks are easy and affordable to fix.

As a reliable roofing company, we’re here to help protect your home and give you peace of mind, rain or shine.

Contact KVN Portland Roofing today for professional roof leak repair services, and keep your roof—and your home—secure for years to come.


KVN Construction
(503) 477-3854

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