What Is Flashing for Roofing?

When rain starts pouring, your roof’s first real defense isn’t just the shingles—it’s the flashing hidden underneath. Flashing may not be the most visible part of your roof, but it plays a massive role in keeping your home leak-free. So, what is flashing? This blog post explains what flashing is, its importance, the most common types used, and how Restoration Roofing installs it correctly with their comprehensive full roof replacement services in Howard County.

What Is Flashing?

Flashing is a thin layer of waterproof material—usually metal, such as galvanized steel, aluminum, or copper—installed to direct water away from vulnerable parts of the roof. You’ll find flashing around chimneys, roof valleys, skylights, vents, and anywhere two surfaces meet. It acts like a leak shield, guiding water toward the shingles and gutters instead of letting it seep into cracks. Without flashing, even the best shingles won’t stop moisture from slipping in where it shouldn’t.

The Importance of Proper Roof Flashing

Flashing isn’t just a “nice-to-have”—it’s critical. If flashing fails or isn’t installed correctly, water can leak into your roof deck, insulation, walls, or ceiling. That means mold, rot, and expensive damage can take place.

Here’s what makes proper roof flashing so important:

• Prevents Costly Leaks: Flashing is your roof’s first defense against water intrusion.

• Protects Structural Integrity: Without it, water damage can weaken your roof’s frame.

• Extends Roof Lifespan: Quality flashing means fewer repairs and longer-lasting materials.

Keeping your home dry starts with getting the flashing right. Whether it’s a new roof or a replacement, you don’t want to cut corners here.

Different Types of Roof Flashing

There are several types of roof flashing used to keep different areas of the roof watertight. The type used depends on the shape, slope, and features of your roof. Here are the most common and important types used by professionals:

Step Flashing

This type of flashing is used where a roof meets a vertical surface, like a wall or dormer. Step flashing on roof installations overlap each other like shingles, guiding water safely down without letting it slip behind the wall or into seams.

Continuous Flashing

Also known as apron flashing, continuous flashing is a single, long strip that directs water downward. It works well under siding or where a sloped roof meets a vertical wall.

Base & Counter Flashing

Base and counter flashing work together as a two-part system to waterproof vertical roof penetrations, such as chimneys and dormers. Base flashing is installed at the bottom, allowing water to flow down and away from the joint, while counter flashing is placed over it and secured into the wall or structure to prevent water from getting behind the base layer.

Valley Flashing

Installed in the “valleys” where two roof slopes meet, this flashing helps channel large amounts of water during storms to keep it from pooling or seeping into seams.

Chimney Flashing

Chimney flashing is a combination of step, counter, and base flashings used to seal the intersection of the chimney and roof fully. Without it, chimneys are major leak zones.

Get Top-Tier Flashing in Every Roof Replacement with Restoration Roofing

At Restoration Roofing, installing roof flashing isn’t an afterthought—it’s a top priority. We specialize in full roof replacements, which means using the right types of roof flashing in the right places to prevent future issues. Our experienced team knows how to identify weak points and protect them before leaks occur. Here’s what makes our roofing work stand out:

• Manufacturer-backed Quality: We’re a CertainTeed Select ShingleMaster offering 25-year labor and 50-year material warranties.

• No Flashing Shortcuts: Every roof comes with properly installed flashing at valleys, walls, and chimneys.

• No Repairs, Just Full Protection: We focus solely on full roof replacements, ensuring the entire system—flashing included—is built to last.

With hundreds of successful installations across Maryland, Northern Virginia, and Washington D.C., you can trust us to get flashing right the first time.

Conclusion: What Is Flashing and Why Does It Matter?

In conclusion, flashing is one of the most critical yet overlooked components of a healthy, long-lasting roof. Whether it’s step flashing, drip edges, or counter flashing, each of the roof flashing types plays a key role in protecting your home.

If your roof is due for a replacement or you’re unsure about the condition of your flashing, don’t wait. Call us at 410-489-7663 or visit our website to get a free estimate from Maryland’s trusted roofing experts.

FAQs About Roof Flashing

What are roof flashings?

Roof flashings are waterproof materials—usually metal—installed at joints, edges, and other areas of the roof to keep water out. They protect areas where shingles alone can’t seal completely.

How do I know which kinds of roof flashing I need?

The kind of roof flashing you need depends on your roof’s shape and features. A qualified roofing contractor in Maryland can assess areas such as chimneys, valleys, and vents to determine the appropriate flashing type.

How long does flashing for shingle roofs typically last?

Flashing for shingle roof systems can last 20 to 30 years or more, depending on the material used and the quality of installation. Copper and galvanized steel tend to outlast cheaper alternatives.

Can I install flashing on a roof myself?

While it’s possible to install flashing yourself, it’s not recommended unless you have experience with roofing. Improper installation is a significant cause of leaks, so it’s best left to professionals.