5 Common Causes of Leaks and How to Repair Roof Flashing

Your roof does more than just keep the rain out—it’s a complex system designed to direct water safely away from vulnerable areas. One of the most important components of a roof system is roof flashing. These thin strips of metal are installed around chimneys, skylights, vents, and roof valleys to seal joints and keep water from seeping inside.

If flashing is damaged, poorly installed, or worn down over time, it can quickly lead to roof leaks, water damage, and even structural issues. If left unchecked, a small gap can become a costly problem for your home.

In this blog, we’ll explain what roof flashing is and why it matters, walk through five common causes of flashing damage, share the key signs it’s time for a repair, and show why trusting a professional is the best way to protect your investment.

What Is Roof Flashing and Why Does It Matter?

Roof flashing is one of those roofing components you rarely notice but can’t live without. It’s made of thin metal pieces (usually aluminum, copper, or galvanized steel) installed in critical areas where your roof meets other structures, like chimneys, skylights, vents, and valleys.

Flashing directs water away from vulnerable joints and openings. Without it, rainwater and melting snow could easily sneak under your shingles, seep into your roof deck, and cause leaks, mold, and structural deterioration.

Think of flashing as your roof’s line of defense against water damage. When it’s properly installed and maintained, flashing protects your home’s integrity. But your entire roof system can be at risk when missing, damaged, or corroded.

5 Common Causes of Roof Flashing Damage

Even the best roofing materials don’t last forever, and flashing is no exception. Here are some of the most common reasons flashing can fail:

1. Weather Exposure

High winds, heavy rain, snow, and hail can loosen, dent, or tear flashing. Over time, repeated exposure to Michigan’s unpredictable weather weakens its protective seal.

2. Poor Installation

Water can sneak through gaps if flashing is not aligned correctly or sealed. This is one of the leading causes of premature roof leaks, especially around chimneys and skylights.

3. Corrosion or Material Wear

Metal flashing can rust, corrode, or deteriorate with age. Once weakened, it loses its ability to keep water out.

4. Roof Movement

Your roof naturally expands and contracts with temperature changes. This shifting can cause flashing to pull away from its seal, leaving vulnerable gaps behind.

5. Storm Damage

Severe storms can knock debris into your roof, while ice dams in the winter can lift or bend flashing out of place. Both create opportunities for water intrusion.

Signs You May Need Roof Flashing Repair

Because flashing is tucked away at roof joints and edges, it’s not always easy to spot when it’s failing. Still, there are some clear warning signs homeowners can watch for:

• Water stains on ceilings or walls — often the first visible clue that water is sneaking past your roof’s defenses.
• Dampness or leaks near chimneys, vents, or skylights — prime spots where flashing plays a critical role.
• Loose, bent, or visibly damaged flashing — if you can see it from the ground or during a roof inspection, it’s time to act.
• Mold or mildew growth in the attic — moisture buildup often traces back to flashing issues.
• Persistent roof leaks after storms — if problems continue even after patching shingles, flashing may be the culprit.

Catching these issues early can mean the difference between a simple flashing repair and a major roof replacement.

How Does Roof Flashing Repair Work?

When flashing fails, it’s vital to repair it correctly to restore your roof’s watertight seal. Here’s what the typical repair process looks like:

1. Inspection – A roofing professional will carefully inspect your roof to pinpoint problem areas and assess the extent of the damage.
2. Removal of Damaged Flashing – Old or deteriorated flashing is removed to make way for a secure replacement.
3. Surface Preparation – The area is cleaned and prepped to ensure the new flashing bonds properly and creates a lasting seal.
4. Installation of New Flashing – Fresh flashing is fitted and sealed into place with high-quality materials designed to withstand the elements.

While it may be tempting to attempt a DIY fix, flashing repair is best left to the professionals. Improper installation can make leaks worse, compromise your roof warranty, and put your safety at risk.

Why Professional Roof Flashing Repair Is Worth It

Cutting corners on flashing repair isn’t worth the risk when protecting your home. Here’s why hiring a professional roofing contractor pays off:

• Expertise in spotting hidden damage – Professionals know where to look and can uncover problems you might miss.
• Proper installation with quality materials – Roofers use flashing to withstand Michigan’s harsh weather, ensuring long-term protection.
• Repairs that prevent future leaks – Correctly installed flashing not only fixes current issues but also safeguards against future water intrusion.
• Cost savings in the long run – Investing in professional repairs now can save you thousands by preventing structural damage, mold, and premature roof replacement.

A reliable roofing expert doesn’t just repair the flashing — they protect the entire system that keeps your home safe and dry.

Protect Your Home With Expert Roof Flashing Repair from Werner Roofing

At Werner Roofing, our team has the experience and expertise to diagnose flashing issues, repair them properly, and give you peace of mind that your home is protected against the elements.

If you’ve noticed any signs of roof flashing damage, contact Werner Roofing today for a free inspection and expert repair you can trust.