When water starts dripping into your home, most homeowners immediately blame their shingles. But here's what roofers know that most homeowners don't: the shingles are usually fine. The real culprit is often the roof flashing — and it's the most overlooked component on any roof.
What Is Roof Flashing?
Roof flashing is thin strips of metal — typically galvanized steel or aluminum — installed wherever your roof meets another surface: chimneys, walls, skylights, vents, and valleys where two roof slopes converge. Its job is simple: redirect water away from these vulnerable joints and keep it moving toward your gutters.
When flashing is installed correctly, it's invisible, and it works. When it fails — even slightly — water finds every gap.
Why Flashing Fails
Flashing doesn't last forever, and several things accelerate its breakdown:
- Age and corrosion: Metal flashing eventually rusts and corrodes, especially in climates with heavy seasonal rain and temperature swings — both common across Missouri and the Four-States area.
- Poor installation. Improperly overlapped sections, missing sealant, or flashing nailed too tightly (preventing normal expansion and contraction) are installation errors that lead to early failure.
- Dried-out sealant. The caulk or roofing cement sealing flashing joints dries and pulls away over time. Once that seal breaks, water has a direct path into your home.
- Storm and wind damage: High winds can lift or bend flashing, breaking the watertight seal and exposing joints.
The Most Common Flashing Problem Areas
Flashing fails in predictable places — they show up in the same vulnerable spots every time. If your roof is leaking, flashing is the first place Bridgewater Roofing checks on every roof inspection.
Chimney flashing is the most common failure point. Chimneys require multiple layers of flashing — step flashing, counter flashing, and a saddle behind the chimney — and any one can fail independently.
Valley flashing runs where two roof slopes meet. These channels carry large volumes of water during heavy rain. A small crack or separation in valley flashing can allow significant water intrusion fast.
Vent and pipe flashing (also called pipe boots) seal around plumbing and exhaust vents. The rubber gaskets on these boots crack with age and UV exposure — one of the most common causes of a roof leak on an otherwise healthy roof.
Step flashing along walls and dormers is easy to miss during a visual inspection but fails regularly when sealant dries out or wind pries it loose.
What to Do If You Suspect a Flashing Leak
Don't wait. Roof leaks don't stay contained — water follows framing, insulation, and drywall in unexpected directions, spreading well beyond where it enters. A small flashing repair caught early costs a fraction of what water damage remediation runs if it's ignored through another rainy season.
Start by checking your attic after a heavy rain. Look for water stains, damp insulation, or any sign of daylight around penetrations. If you spot any of these, it's time to call a professional.
Let Bridgewater Roofing Take a Look
The Bridgewater Roofing team serves homeowners across Missouri and the Four-States area with honest assessments, quality roof repairs, and expert roof installations. If you're dealing with a leak — or just haven't had a roof inspection recently — don't wait for the damage to grow.
Contact Bridgewater Roofing today and get ahead of the problem before the next storm rolls through.