Flashing Material for Roof: Galvanized Steel vs Aluminum vs Copper





Flashing Material for Roof: Galvanized Steel vs Aluminum vs Copper

Flashing Material For Roof Galvanized Steel Vs Aluminum Vs Copper

What keeps your roof safe from water damage at junctions or protrusions? The answer is Roof Flashing, an unsung hero in roofing construction. Roof flashing is crucial in directing water away from critical areas of your roof, preventing leaks and structural damage. In this article, we explore three popular flashing materials: galvanized steel, aluminum, and copper, each with its unique benefits and drawbacks.

What Is Roof Flashing?

Roof flashing is a thin material, usually metal, used to direct water away from critical areas of your roof, such as chimneys, vents, and joints. Properly installed flashing is essential to prevent leaks and protect the structure of your home or business.

How Long Does Roof Flashing Last?

The lifespan of roof flashing varies depending on the material used. Generally, you can expect roof flashings to last for several decades.

Galvanized Steel Flashing

Galvanized steel is known for its strength and durability. This steel material is coated with a layer of zinc to prevent rust and corrosion.


  • Durability: It stands up well against harsh weather conditions.
  • Cost-Effective: This is a more affordable option compared to other materials.
  • Low Maintenance: It requires minimal maintenance over its lifespan.


  • Corrosion Over Time: The zinc coating can wear off, especially in areas with high humidity or salt spray.
  • Heavier Material: Its weight might require additional support in the roofing structure.

Galvanized steel flashing is ideal for areas with moderate climates and for property owners looking for a balance between cost and performance.

Aluminum Roof Flashing

Aluminum, a lighter alternative to galvanized steel, offers flexibility and ease of installation.


  • Resistance to Corrosion: It doesn’t rust, making it ideal for coastal areas.
  • Lightweight: This reduces the load on the roofing structure.
  • Versatility: Easily bent and shaped, aluminum suits complex roof designs.
  • Environmental friendliness: Aluminum is virtually infinitely recyclable, making it a sustainable building material.


  • Cost: Aluminum can be more expensive than galvanized steel.
  • Color Limitations: There are fewer color options, which might be a consideration for aesthetic-focused projects.

Aluminum flashing is best for complex roof structures and environments with high moisture or saline exposure.

Copper Roof Flashing

Copper is a premium flashing material known for its longevity and distinct appearance.


  • Longevity: Copper can last for decades, often as long as the building itself.
  • Aesthetic Appeal: It offers a unique, elegant look that ages gracefully.
  • Low Maintenance: Copper is virtually maintenance-free after installation.


  • Higher Cost: The initial investment is significantly higher than  other materials.
  • Color Changes: Copper develops a patina over time, which may not be desirable for all aesthetics.

Copper flashing is the go-to choice for high-end, luxury homes or historic buildings where durability and appearance are top priorities.

Choosing Between Galvanized Steel vs. Aluminum vs. Copper

Selecting the right flashing material depends on several factors:

  • Budget: Balancing cost with quality and longevity.
  • Climate: Considering environmental exposure like moisture and saline.
  • Aesthetic Preferences: Matching the flashing with the overall look of the building.
  • Structure of Roof: Some materials are better suited for complex roof designs.

Protect Your Roof With Superior Roofing

Choosing between galvanized steel, aluminum, and copper for roof flashing comes down to balancing cost, durability, maintenance, and aesthetics. Each material has its place in roofing construction, and the right choice depends on your specific needs and circumstances. For expert advice on replacing roof flashing that's tailored to your roofing project, contact Superior Roofing. Our team of professionals is here to guide you in making the best decision for your property, ensuring your roof remains robust and leak-free for years to come.

About Superior Roofing

Superior Roofing exists to deliver the highest quality roofing experience possible at an affordable cost.

Start the Roofing Repair or Replacement Process

Start by contacting us to schedule a free inspection. We will make a detailed survey of your roof’s condition, document it for your insurance claim, and provide you with an accurate and affordable quote!